21 The kilogram is a measure of an object’s: A) weight B) gravity C) forceD) mass
32Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency is of the rock is to:A) continue to follow a circular pathB) follow a straight line path
43A sheet of paper can be withdrawn from under a milk carton without toppling it as long as the sheet is pulled quickly. This demonstrates:A) gravity tends to hold the carton to the groundB) the carton has inertiaC) for every action there’s an equal reaction
54 Your weight is: A) a property of mechanical equilibrium B) actually your massC) the gravitational attraction between your body and the earth
65One object has twice as much mass as another object, and also has twice as much:A) volumeB) velocityC) inertiaD) gravitational acceleration
76Jupiter has 3 times the gravitational force of Earth. So on Jupiter, a 100kg object would have a mass of:A) 100kgB) 30kgC) 300kgD) 600kg
87An object weighs 20 N on the Earth, another object weighs 20 N on the moon. Which object has more mass?A) Object on the EarthB) Object on the MoonC) Not enough information to say
98 The law of inertia applies to: A) objects at rest B) objects in motionC) both moving and nonmoving objects
109 A force is a vector quantity because it has both: A) mass and accelerationB) action and reaction counterpartsC) magnitude and direction
111010kg brick and a 1kg brick are dropped in a vacuum, the force of gravity on the 10kg brick is:A) zeroB) 10 times as much as the 1kg brickC) the same as the 1kg brick
1211An object is propelled along a straight-line path. If it’s force were doubled, then it’s acceleration would:A) halveB) quadrupleC) doubleD) stay the same
1312An object is propelled in a straight-line path by a force. If the mass of the object is somehow doubles, it’s acceleration:A) halvesB) quadruplesC) doublesD) stays the same
1413An object is pulled northward at 20 N and southward at 15 N. What magnitude of the net force?5 N35 N0 N10 N
1514A 10N falling object encounters 10N of air resistance. The magnitude of the net force is:A) 100NB) 10NC) 0ND) Infinite
1615An apple is held at rest above your head. The magnitude of the net force of the apple is:A) 10NB) 0NC) 100ND) between 10N and 0N
1716 Which has zero acceleration? An object_____ A) at rest B) changing its directionC) changing its speedD) all of these
1817 Whenever the net force on an object is zero, the acceleration A) may be zeroB) is zero
1918A car has a mass of 3000kg and accelerates at 2 m/s/s. What is the magnitude of the force exerted on the car?1500N3000N6000N2000N
2019A tow truck exerts a 2 m/s/s acceleration on a car with a force of 300N. The mass of the car isA) 600NB) 3000kgC) 150kgD) 1500kg
2120A girl pulls a 10kg wagon with a constant force of 300N. What is the wagon’s acceleration in m/s/s?A) .3B) 3000C) 30D) 1/30
2221Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude but in the opposite direction.A) Always trueB) Sometimes trueC) Usually true
2322A high school student hits a nail with a hammer. During the collision there is a force:A) On the hammer but not the nailB) On the nail but not the hammerC) On both hammer and nail
2423 Forces always occur: A) in singles B) in pairs C) in triplets D) in space
2524A rocket is able to propel itself in in the vacuum of space by firing its engines. The force that propels the rocket is:A) The exhaust gasses pushing on spaceB) The exhaust gasses heating up the shipC) The exhaust gasses rushing away from the ship
2625An archer shoots an arrow. Consider the action force to be the bowstring pushing against the arrow. The reaction force is:A) air resistance pushing against the arrowB) the grip of the archers hand on the bowC) the push of the arrow against the bowstringD) none of these
2726A baseball player bats a ball with a force of 1000N, the ball exerts a reaction force against the bat ofA) 100NB) 1000NC) A little less than 1000ND) Not enough information
2827As the ball falls, the action force is the mass of the earth pulling on the ball. The reaction force isA) the ball’s pull on the earthB) nonexistent in this caseC) the ball hitting the groundD) air resistance
2928A karate chop delivers a blow of 3,000N to a board that breaks. The force that acts on the hand is actually:A) more than 3000NB) less than 3000NC) exactly 3000ND) depends if the board was oak or ash
3029Arnold Strongman and Suzy Small pull hard in opposite directions in a tug of war. The greatest force on the rope is exerted by:A) Suzy, suprisinglyB) Arnold, of courseC) both the same
3130 Which of the following is not an acceleration? Stopping your bike at an intersection.Riding your bike at a constant speed around a corner.Slowing your bike down as you reach the top of the hill.Riding your bike faster as you ride down the hill.Riding your bike straight down the street at a constant speed.
3231 ___________ is the pull that all objects exert on each other. ResistanceFrictionInertiaGravity
3332At the surface of Jupiter’s moon Io, the acceleration due to gravity is 2.5 m/s/s. A watermelon weights 44.0 N at the surface of the earth. What is the mass on the earth’s surface?What are its mass and weight on the surface of Io?
3433What is the net force required to give an automobile of mass kg an acceleration of 4.5 m/s/s?
3534During a test crash, an air bag inflates to stop a dummy’s forward motion. The dummy’s mass is 75.0 kg. If the net force on the dummy is 825. N toward the rear of the car, what is the dummy’s acceleration?
3635A bicycle takes 8.0 seconds to accelerate at a constant rate from rest to a speed of 4.0 m/s. If the mass of the bicycle and rider together is 85. kg, what is the net force acting on the bicycle?
3736You are waiting in line to use the diving board at your local pool. While watching people dive into the pool from the board, you realize that using a diving board to spring into the air before a dive is a good example of Newton’s third law of motion. Explain how a diving board illustrates Newton’s 3rd law.
3837If bullets are fired from an airplane in the direction of its motion . . .the speed of the airplane will increase.the speed of the airplane will decrease.there will be no change in the speed of the airplane.the speed will change but the velocity will remain the same.
3938Which exerts more force, the Earth pulling on the moon or the moon pulling on the Earth? Explain.
4039When a heavy football player and a light one run into each other, which player hits the other with more force? Explain. Which one is hurt more by the collision? Explain.
4140 Equilibrium is the state of motion where All forces on an object are balanced.An object can be accelerating or sitting at rest.Both A and BNeither A nor B
4241According to Newton’s second law of motion, if the net force acting on the object increases while the mass of the object remains constant, what happens to the acceleration?Acceleration decreasesAcceleration increasesAcceleration remains the sameAcceleration is independent of mass
4342In order to start a grocery cart in motion, you must exert 72.0 newtons of force on the handle. The mass of the grocery cart is 61.0 kg. How much force does the cart exert on your hand as you accelerate it forward?4400 N1.2 N72.0 N0 N
4443 How much does a 9.8 kg pail of water weigh? 9.80 kg 96.0 N 9.80 N
4544When an object is not in equilibrium, what kind of motion can it have?CircularAcceleratingDeceleratingAll of the above
4645A helicopter weighs 12,800 N, how much force must its rotors exert on the air in order to start it rising into the air from its landing pad?
4746A 2 kg box sits on a 3 kg box which sits on a 5 kg box. The 5 kg box rests on a table top. What is the normal force exerted on the 5 kg box by the table top?19.6 N29.4 N49 N98 N
4847A 2 kg box sits on a 3 kg box which sits on a 5 kg box. The 5 kg box rests on a table top. What is the normal force exerted by the 5 kg box on the 3 kg box?19.6 N29.4 N49 N98 N
4948A car pulls on a rope tied to a tree with a force of 1000 N. Which of the following is not true?The rope pulls on the tree with a force of 1000 newtons.The tree pulls on the rope with a force of 1000 newtons.The tension in the rope is 2000 newtons.The tension in the rope is 1000 newtons.
5049 A free-body diagram of a ball in free fall would show a downward arrow to represent the force of air resistance.only a downward arrow to represent the force of gravity.a downward arrow to represent the force of gravity and an upward arrow to represent the force of air resistance.an upward arrow to represent the force of gravity and a downward arrow to represent the force of air resistance.
5150Which of the following is the tendency of an object to maintain its state of motion?AccelerationInertiaForceVelocity
5251If a nonzero net force is acting on an object, then the object is definitelyat rest.moving with a constant velocity.being accelerated.losing mass.
5352According to Newton’s 2nd law, when the same force is applied to two objects of different masses,the object with greater mass will experience a great acceleration and the object with less mass will experience an even greater acceleration.the object with greater mass will experience a smaller acceleration and the object with less mass will experience a greater acceleration.the object with greater mass will experience a greater acceleration and the object with less mass will experience a smaller acceleration.the object with greater mass will experience a smaller acceleration and the object with less mass will experience an even smaller acceleration.
5453A hammer drives a nail into a piece of wood. Identify an action-reaction pair.The nail exerts a force on the hammer; the hammer exerts a force on the wood.The hammer exerts a force on the nail; the nail exerts a force on the hammer.The hammer exerts a force on the nail; the hammer exerts a force on the wood.
5554When a car is moving, what happens to the velocity and acceleration of the car if the air resistance becomes equal to the force acting in the opposite direction?
5655A force of 10. N applied to a given mass accelerates is at 1.0 m/s/s. The same force applied to a mass one-half as great would produce an acceleration of1.0 m/s/s2.0 m/s/s0.50 m/s/s4.0 m/s/s
5756A certain net force causes a 10. kg mass to accelerate at 20. m/s/s. The same force will cause a 5.0 kg mass to accelerate at9.8 m/s/s10. m/s/s25. m/s/s40. m/s/s
5857 If the sum of all the forces acting on a car is zero, the car must be at rest.may be at rest.must be moving at a constant speed.must be accelerating.
5958 Which of the following is equal to one Newton? Kg m/s Kg m Kg m/s/s
6059The weight of an apple to closest to1 N9.8 N19.6 N980 N
6160On the surface of a distant planet a 5 kg mass weighs 20 N. What is the acceleration due to gravity there?0.25 m/s/s1 m/s/s4 m/s/s15 m/s/s
6261 If we know an object is moving at constant velocity, we may assume the net force acting on the object is zero.there are no forces acting on the object.the object is accelerating.the object is losing mass.the net force acting on the object isn’t zero.
6362A 7.0 kg bowling ball experiences a net force of 5.0 N. What will be its acceleration?35 m/s/s7.0 m/s/s5.0 m/s/s0.71 m/s/s0.52 m/s/s
6463Rita accelerates a 0.40 kg ball from rest to 9.0 m/s during the 0.15 seconds in which her foot is in contact with the ball. What average force does she apply to the ball during the kick?48 N72 N24 N60 N76 N
6564As a 3.0 kg bucket is being lowered into a 10 meter deep well, starting from the top, the tension in the rope is 9.8 N. The acceleration of the bucket will be6.5 m/s/s downward9.8 m/s/s downwardzero3.3 m/s/s upward5.6 m/s/s upward
6665A karate master strikes a board with an initial velocity of 10.0 m/s, decreasing to 1.0 m/s as his hand passes through the board. If the time of contact with the board is seconds and the mass of the coordinated hand and arm is 1.0 kg, what is the force exerted on the board?1000 N1800 N2700 N4500 N5600 N
6766In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on themoon.Earth.planet Jupiter.
6867An object is propelled along a straight-line path by a force. If the net force were doubled, the object’s acceleration would behalf as much.twice as much.the same.four times as much.None of these
6968An object is propelled along a straight line path in space by a force. If the mass of the object somehow becomes twice as much, its accelerationquadruples.doubles.stays the same.halves.None of these
7069The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity ismore than 10 N.less than 10 N.10 N.
7170An apple at rest weighs 1 N. The net force on the apple when it is in free fall is0 N.0.1 N1 N9.8 NNone of these
7271 An object following a straight line path at constant speed has a net force acting upon it in the direction of motion.has zero acceleration.has no forces acting on it.None of these.
7372A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly becausegravity becomes weaker with increased distance.the applied force on the rocket increases as burning of fuel progresses.the mass of the rocket decreases as fuel is burned.
7473A rock is thrown vertically into the air. At the top of its path, its acceleration in meters per second per second iszero.9.8.between 0 and 9.8.greater than 9.8.
7574Suppose a particle is being accelerated through space by a 10 N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. The particle with both forces acting on itis brought to a rapid halt.decelerates gradually to a halt.continues at the speed it had when it encountered the second force.theoretically tends to accelerate toward the speed of light.None of these
7675A 1 kg rock that weighs 9.8 N is thrown straight upward at 20 m/s. Neglecting air resistance, the net force that acts on it when it is half way to the top of its path isless than 9.8 N.9.8 N.more than 9.8 N.
7776If an object of constant mass experiences a constant net force, it will have a constantvelocity.speed.acceleration.position.
7877If less horizontal force is applied to a sliding object than is needed to maintain constant velocitythe object accelerates in the direction of the applied force.the friction force increases.the object eventually slides to a stop.None of these