Presentation on theme: "Given the formula, (average speed =total distance divided by total time), what is the bird’s average speed if it flies 150 m for 10 s, then 200 m for."— Presentation transcript:
Given the formula, (average speed =total distance divided by total time), what is the bird’s average speed if it flies 150 m for 10 s, then 200 m for 10 s, and then 100 m for 5 s? a.150 m/sc.18 m/s b.100 m/sd.8.33 m/s
Given the formula (F=ma), how much force is needed to accelerate a 62 kg rider and her 300 kg scooter at 6 m/s/s? a.300 Nc.2172 N b.200 Nd.8.33 N
If the driver of a car suddenly makes a sharp turn, why will the passenger slide to the other side of the car? a.frictionc.inertia b.gravityd. Air resistance
Use Newton’s second law of motion (F=ma) to calculate the mass of an object when the force of 28 N accelerates the object 3 m/s/s. a.0.1 kgc.9.3 kg b.84 kgd.8.33 kg
a. Distance traveled and total time b. Starting point, endpoint, and the object’s mass c. Starting velocity, final velocity, and the time it takes to change velocity d. Average speed and direction traveled What does one need to know to be able to calculate an object’s acceleration?
Because of projectile motion, where would one aim when shooting at a target? a. Above the bull’s eye b. Below the bull’s eye c. To the left of the bull’s eye d. To the right of the bull’s eye
In an action film, the hero is running forward along the top of a train that is traveling at 30 m/s. He’s chasing a villain at a rate of 6 m/s toward the front of the train. What is the hero’s resultant velocity during the chase? a.3 m/s forwardc.30 m/s forward b.24 m/s forwardd.36 m/s forward
a. The ball will remain in motion forever or until it hits another object b. The ball will slow down and eventually come to a stop c. The ball will not move in space for more than 5 km d. The ball will explode due to friction If an astronaut throws a ball in space, when will the ball stop?
Inertia is used when explaining which one of Newton’s laws? a.First law of motionc.Third law of motion b.Second law of motiond.Fourth law of motion
Which of the following objects have the LEAST inertia: a kg dump truck full of dirt c. a 30 kg rock b. a 2000 kg car d. a 5 kg cat
What causes a person to fall backward against the seat when an airplane takes off? a.Air resistancec.Gravity b.Inertiad.Friction
When the brakes are suddenly applied to a moving vehicle, what causes a person to move forward in his/her seat? a. Air resistancec.Gravity b. Inertiad.Friction
a. It decreases as its mass increases and as the force acting on it increases b. It decreases as its mass decreases and as the force acting on it increases c. It increases as its mass increases and as the force acting on it increases d. It increases as its mass decreases and as the force acting on it increases What does Newton’s second law of motion state about an object’s acceleration?
a. The rock will have a greater acceleration than the ball b. The ball will have a greater acceleration than the rock c. Neither the ball nor the rock will accelerate, they will only have a velocity d. The rock and the ball will have the same acceleration. A student kicks a 0.7 kg ball. She then kicks a 70 kg rock with the same force. What can be said about the acceleration of the ball as compared to the rock?
What force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s/s (F=ma)? a Nc.1,250 N b.40.0 Nd.50,000 N
If a force of 45N acts on an object with a mass of 12 kg, what is its acceleration? (F=ma) a.0.26 m/s/sc.540 m/s/s b.3.75 m/s/sd.25 m/s/s
a. Have another student help push the chair b. Have the man in the chair hold 50 kg of bricks c. Have the man in the chair put his feet on the floor d. Have the man sit “Indian style” on the chair A student is pushing a 100 kg man in a chair with all the strength she can generate. How could she increase the acceleration of the man?
a. A force equal in speed and in the same direction b. A force moving in the same direction and it is the same size c. A force larger in speed and opposite in direction d. A force equal in size and opposite in direction According to Newton’s third law of motion, when a force is exerted on an object what does the second force produce?
a. Without knowing the momentum, it cannot be determined b. Since the momentum would be 0, the force exerted by the chair would be 0 Newton's c. 40 N d. 80 N A man is pushing down with a force of 40 N in on a chair. How much force is the chair exerting?
If an astronaut uses a jet of nitrogen to maneuver in space, what law is BEST illustrated as the nitrogen is expelled? a.Newton’s first lawc.Newton’s third law b.Newton’s second lawd.Newton’s fourth law
What is the term for slanted surface used to raise an object? a.wedgec.Inclined plane b.screwd.lever
a. From areas of low to high pressure b. From areas of high to low pressure c. They move sideways d. There is no movement at all How do gases and air flow?
a. A large input force over a long distance b. A small input force over a long distance c. A large and small input force over a long distance d. A small output force over a long distance How do you describe the input force and distance of a screw?
a. The rope with 1 pulley b. The rope with 2 pulleys c. The rope with 3 pulleys d. The rope with 4 pulleys A student wants to lift a 70 kg box. She has four pulleys and a 18 m rope. Which arrangement would have the greatest mechanical advantage?
a. The ramp is longer so less force is required to ride up b. The ramp is longer so more force is required to ride up c. The ramp is shorter so less force is required to ride up d. The ramp is not designed for better mechanical advantage. Two bicycle ramps have the same height. The first ramp is twice as long as the second ramp. Why does the first ramp have a better mechanical advantage?
A construction worker is given four hammer of different lengths, (20cm, 25 cm, 30 cm, & 45 cm) which hammer would give him the best mechanical advantage? a.20 cm hammerc.30 cm hammer b.25 cm hammerd.45 cm hammer
What type of simple machine is a jar lid? a.Leverc.Wheel & Axle b.Screwd.Wedge
a. They be unable to move b. The fluids in their bodies would exert the same pressure as the pressure outside of their bodies c. The fluids inside their bodies would have a greater pressure than the outside of their bodies, and they would explode d. The fluids in their bodies would have a pressure less than pressure outside of their bodies, and they collapse upon themselves. What would happen if astronauts, who wear pressurized suits in space, took their suits off?
In what direction is fluid pressure always directed? a.Upc.Sideways b.Downd.In all directions
a. Rolling Friction b. Fluid Friction c. Static Friction d. Sliding Friction What type of friction is air resistance known as?
a. Smallest Board b. The rounder board c. The longest board d. The fulcrum A student is given a 10 kg rock, four boards and a fulcrum to make a lever. Which board would have the greatest mechanical advantage if the fulcrum is in the same place relative to the load?
a. Static friction b. Sliding Friction c. Rolling Friction d. Fluid Friction What type of friction is responsible for a car’s tires wearing away, making them smooth, after several km’s
a. Liquids take on the shape of their containers and gases do not b. Liquids can be compressed and gases cannot c. Gases can be compressed and liquids cannot d. Gases cannot exert a force but liquids can Why do hydraulic devices use liquids instead of gases?
What is the pressure exerted on the floor by a 5,000 N crate with an area of 10m 2 ? (Pa = F/a) a.500 Pac Pa b.50,000 Prd.5,010 N
a. Because the fluid on top of the wing is moving faster than the fluid on the bottom of the wing b. Because or Bernoulli’s principle and decrease of pressure which provides lift c. Neither A or B d. Both A and B Air is made up of gases, it can be called a fluid. Why is an airplane able to fly within this fluid?
a. The original is greater than the final b. The original is less than the final c. They are the same pressure d. The final pressure is one half of the original A syringe with air is stoppered. It is then pushed in. what can be said of the original air pressure as compared to the final
What is the density of a 50 cm 3 sample of liquid with a mass of 300 g? (D = m/V) a.15,000 g/cm 3 c.0.16 g/cm 3 b.6 g/cm 3 d.350 g/cm 3
a. At 6 meters in height b. At 1 meter in height c. Just before it hits the ground d. It cannot be determined from the information given A ball falls from a height of 6 meters in the absence of air resistance. When does the ball have the GREATEST kinetic energy and the LEAST potential energy?
a. Kinetic energy is increased and potential energy is not affected. b. Kinetic energy is decreased and potential energy is decreased c. Kinetic energy is decreased and potential energy is increased d. The kinetic energy remains the same and the potential energy decreases. A vehicle is traveling at 25 km per hour. It increases its speed to 60 km per hour. What happens to its kinetic and potential energy?
a. The one traveling horizontally has the greatest kinetic energy and least potential energy b. The one traveling vertically has the greatest kinetic energy and the least potential energy c. It cannot be determined from the information given d. They have the same kinetic energy but the one traveling horizontally on the floor has the least potential energy Two objects have the same masses. One object is traveling vertically 25 km/s. The other object is on the floor and is traveling horizontally at a speed of 25 km/s. Which one has the greatest kinetic energy and the least potential energy?
a. Small truck traveling 25 m/s b. Large truck traveling 30 m/s c. Small car traveling 40 m/s d. Large truck traveling 60 m/s A student is observing traffic and sees four vehicles: a large truck traveling 60 m/s, a large truck traveling 30 m/s, a small car traveling 40 m/s and a small care traveling 25 m/s. which vehicle has the MOST kinetic energy?
a. Because the fluids inside your body exerts pressure inward b. Fluids causes your body to explode c. It cannot be determined from the information d. Because the fluids inside your body also exerts pressure outward Why do you not notice atmospheric pressure on your body?
a. Potential energy is increased b. Potential energy is decreased c. None of the above d. It does not affect the potential energy By increasing the speed of an object, what happens to it potential energy?
What is the SI unit for energy? a.Caloriec.Meter per second b.Jouled.Kilogram
What is the net force of a combined force of 12 N north with a force of 4 N south? a.48 N northc.3 N north b. 8 N northd.0.3 N north
What is the net force on an object if one force has a magnitude of 10 N and is directed toward the north and the other has a magnitude of 5 N directed toward the south? a.50 N northc.10 N north b.5 N northd.0.5 N north
What is the resultant velocity if a passenger on a bus traveling 20 m/s east decides to move from the front of the bus to the back walking at a rate of 2 m/s? a.22 m/sc.10 m/s b.18 m/sd.0.1 m/s
What is the SI Unit for speed? a.Kilogramc.joule b.M/sd.watts
To open a bottle, One would apply a force of 90 N to the bottle opener. The bottle opener applies a force of 225 N to the bottle cap. What is the mechanical advantage of the bottle opener? a.20,250c.0.4 b.2.5d.315
What type of simple machine is an inclined plane with one or two sloping sides? a.leverc.Inclined plane b.wedged.screw
What is the SI Unit for pressure? a.G/cmc.M/s/s b.Pad.kg
What is the weight of a rock with an area of 10 m2 that exerts a pressure of 250 Pa in correct SI Units (Pa=F/a)? a.260 Nc.25 N b.2,500 Nd.0.4 N
a. The top of the biggest hill b. The bottom of the biggest hill c. The top of the smallest hill d. The bottom of the smallest hill A roller coaster travels up and down a large hill and a small hill. At what point on the hills does a roller coaster have the greatest kinetic energy and least potential energy?
a. Distance must increase b. Distance must decrease c. Distance must remain the same d. None of the above When a machine increases the size of the force exerted, what happens to the distance through which the force is exerted?
a. It is different from the weight of the ice cube b. It is the same as the weight of the ice cube c. It is different from the weight of the water d. None of the above An ice cube is dropped into a glass of water that is filled to the top. The ice cube causes some of the water to overflow. What is true of the weight of the displaced water?
a. Direction of the output force b. Direction of the pulley c. Directions of the input force d. The direction does not change What does a single pulley change on an object?
a. Volume equal to its own mass b. Volume equal to its own density c. Volume equal to its volume d. None of the above What volume of fluid does an object displace?
a. Bernoulli’s Principle b. Archimedes Principle c. Pascal’s Principle d. None of the above The reason you blow round bubbles and not square ones is explained by what principle?
Using the graph, which line depicts an object traveling with the GREATEST speed? (speed = distance/time) a.Line Ac.Line C b.Line Bd.Line D
a. The acceleration will decrease b. The acceleration will remain the same c. The acceleration will increase only d. The acceleration will not be effected According to Newton’s 2 nd law, if there is an increase in force, what will happen to the acceleration of the object?
a. Remain at rest b. Move in the opposite direction c. Remain in motion d. Will not move at all According to Newton’s 1 st law of motion, what will the moving object that is not acted on by an unbalanced force do?
a. Rolling friction b. Sliding friction c. Static friction d. Fluid friction What causes the napkins to stay on the picnic table even though there is a slight breeze?
a. acceleration b. force c. Average speed d. mass What is being calculated if 9.6 km (distance) is divided by 2.5 h (time)?
a. Time b. Acceleration c. Speed d. Force What is determined if the distance a car travels is divided by the time it took the car to travel that distance
a. Friction b. Gravity c. inertia d. Air resistance What factor explains the tendency of all objects to resist any change in motion?
a. Newton’s first law b. Newton’s second law c. Newton’s third law d. Newton’s fourth law Which of Newton’s laws states that for every action there is an equal but opposite reaction?
a. Remains the same until it hits terminal velocity b. Decreases by 9.8 until it hits terminal velocity c. Increases by 9.8 until it hits terminal velocity d. Average speed and direction traveled All objects accelerate toward the Earth at a rate of 9.8 m/s. what is the effect on velocity for every second that the object falls?
a. 60 m/s/s north b. 30 m/s/s north c. 50 m/s/s north d. 100 m/s/s north Given the formula,(acceleration= final velocity- starting velocity divided by the time) what is the planes acceleration from Mobile to Saraland if the planes passes over Mobile with a velocity of 8,000 m/s north and then passes over Saraland at a velocity of 10,000 m/s north 40 s later?
a. 10 m/s/s south b. 10,000 m/s/s south c. 1 m/s/s south d. 100 m/s/s south Given the formula,(acceleration= final velocity- starting velocity divided by the time) what is the planes acceleration of the wind if it blows with a velocity of 15 m/s south and five seconds later, the winds velocity is 20 m/s south?
a. 0.1 m/s b. 6,250 m/s c. 10 m/s d. It cannot be determined from the information given Given the formula, (average speed= total distance divided by total time), what’s a bird average speed if it flies 250m for 25 s? (s=d/t)
a. Velocity or speed b. Direction or speed c. Direction or acceleration d. Direction or velocity What factors cause a change in acceleration?
a. Inertia b. Gravity c. Friction d. Air resistance What is the force that opposes motion between two surfaces that are touching?