Presentation on theme: "Warm-up: Anticipation Guide"— Presentation transcript:
1Warm-up: Anticipation Guide Directions: Carefully read the statements on your anticipation guide. Think about the statement and determine if you generally agree or disagree with it by marking an X next to your answer. Be sure to provide an explanation for your response by writing it next to the “Why?”Next: Look at the basket of materials in front of you. Using only those materials, your desk, your book, and/or your body, find a way to justify your answer.
2Anticipation GuideAn object can move with or without a force being applied.Agree ____ Disagree _X_Why? Newton’s first law explains that an object in motion will stay in motion while an object at rest will stay at rest unless acted upon by an unbalanced force.Example: Planets rotating in space, spinning top, eggsWhen forces act in opposite directions, they always cancel each other out.Why? Only if they are balanced will they cancel each other out. If they are unbalanced, they will not.Example: Arm wrestling, tug-of-war
3Anticipation GuideWhen an equal force acts on two different objects, the objects will move at the same speed in the same direction.Agree ____ Disagree _X_Why? It would depend on the mass of the objects. F=MA (Newton’s 2nd law)Example: Spring scales pulling objects with different massesWhen forces act in the same direction, the net force can be found by adding the strengths of the individual forces.Agree _X_ Disagree ____Why? The forces will combine togetherExample: Tug of war, getting a friend to help you lift something heavy
4Anticipation GuideGravity pulls equally on all objects everywhere on earth.Agree _X_ Disagree ____Why? Gravitational pull is the same regardless of where you are.Example: No matter where I drop a ball around a room, it still falls back to the Earth.The mass of an object will affect how fast it moves or falls to the earth.Agree ____ Disagree _X_Why? Rate of acceleration (9.8m/s2) doesn’t change regardless of mass Example: dropping similar objects with different masses
5Anticipation GuideSmooth surfaces produce less friction than rough surfaces.Agree _X_ Disagree ____Why? Less surface area to come in contact with other materialExample: sand paper vs. waxed paperYou and a friend are at the park playing on a seesaw. In order for it to move, the forces must be unbalanced.Why? Newton’s first law explains that an object in motion will stay in motion while an object at rest will stay at rest unless acted upon by an unbalanced force. Example: Washers on ruler seesaw
6Anticipation GuideA boat is cruising down the river. Seated passengers on the boat are moving in comparison to the boat.Agree ____ Disagree _X_Why? The distance between the passengers and the boat doesn’t change. Therefore, they are not moving in comparison to the boat.Example: People in cars don’t move in relation to the car.A car is traveling down the highway and stops suddenly for a red light, the force applied to the brakes will cause everything in the car to stop moving.Why? Newton’s first law explains that an object in motion will stay in motion while an object at rest will stay at rest unless acted upon by an unbalanced force.Example: Washers on car will fly when car stops.
7MOTION How can you describe an object’s motion? Standards:S8P3 – Investigate the relationship between force, mass, and the motion of objects.S8P3a – Demonstrate the effect of balanced and unbalanced forces on objects in terms of gravity, inertia, and friction.Essential Questions:How can you describe an object’s motion?What causes an object’s motion to change?
8MotionAn object is in motion if its distance from another object is changing.
9Reference PointA place or object used for comparison to determine if something is in motion.
10Measuring DistanceScientists use the INTERNATIONAL SYSTEM OF UNITS (SI UNITS) to communicate their measurements clearly.
11SpeedThe speed of an object is the distance the object travels per unit of time.Speed = DistanceTime
12Average Speed The total distance traveled divided by the total time. Average Speed = Total DistanceTotal Time
13Instantaneous SpeedThe rate at which an object is moving at a given instant in time.
15SlopeThe steepness of a line on a graph.Slope = RiseRun
16Assignment:Make sure you have completed workbook pages #’s 1-9Complete workbook page #’s 1-8
17Warm-up:Your mom asks what you what you’ve been learning about in science. You mention things like, “motion, reference point, speed, average speed, instantaneous speed, and velocity,” but she doesn’t know what these words mean. Without giving her a word-for-word definition of each term, how would you explain it to her? Write a one-paragraph response.
18Acceleration The rate at which velocity changes. Refers to increasing speed, decreasing speed, or changing direction.Acceleration = final speed – initial speedtime
19Practice:In your composition book, solve the following: If a snowflake is falling at 1m/s, and 4 seconds later, it is falling at 5m/s, what is its rate of acceleration?
20ForceA force is a push or a pull, described by its strength and the direction in which it acts, measured in SI unit called the NEWTON.
21Net ForceThe combination of all forces acting on an object; it determines whether an object moves and also in which direction it moves.
22Unbalanced ForcesCause an object to start moving, stop moving, or change direction.Result in a net force and cause a change in the object’s motion.
23Balanced ForcesEqual forces acting on one object in opposite directions.Do not change the object’s motion.
33Factors Affecting Gravity MASS – a measure of the amount of matter in an object (kg).DISTANCE BETWEEN OBJECTS – the farther apart two objects are, the lesser the gravitational force between them.
34Weight and MassMASS – a measure of the amount of matter in an object (kg).WEIGHT– The force of gravity on a person or object at the surface of a planet..
35Free FallWhen the only force acting on an object is gravity, it is in free fall.The force of gravity is unbalanced, which causes an object to accelerate.Acceleration is 9.8m/s2
36Air ResistanceA type of fluid friction objects falling through air experience.
37Terminal VelocityThe greatest velocity a falling object reaches when the force of air resistance equals the weight of the object.
38Projectile Motion An object that is thrown is a projectile. A projectile will fall at the same rate as any dropped object.
39Warm-up:Recall Newton’s 1st and 2nd Laws… try to put them in your own words!
40Newton’s First Law (Inertia) An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.
41Inertia depends on mass. The more mass an object has, the harder it is to change the rate of acceleration.
42Newton’s Second LawAcceleration depends on the object’s mass and on the net force acting on the object.Acceleration = net forcemass
43Newton’s Third LawIf one object exerts a force on a second object, the second object exerts a force of equal strength in the opposite direction on the first object.
44MomentumA characteristic of a moving object that is related to the mass and velocity of the object.Momentum = Mass x Velocity
45Law of Conservation of Momentum The total momentum of any group of objects remains the same, or is conserved, unless outside forces act on the objects.
46Centripetal forceAny force that causes an object to move in a circular path.Amusement Park Fun
47DisplacementHow far an object changes its position from start to finish.
48PressureA force exerted over an area on the surface of an object.
49Pressure decreases as the area over which a force is distributed increases. It is measured in Newtons/square meter (N/m2) …aka the PASCALWrite this
50Fluid PressureAll of the forces exerted by the individual particles in a fluid combine to make up the pressure exerted by the fluid.Air pressure is an example of fluid pressure.
51Balanced PressureIn a stationary fluid, pressure at a given point is exerted equally in all directions.
52Atmospheric PressureAs your elevation increases, atmospheric pressure decreases; there’s less air above you!
53Water PressureWater pressure increases as depth increases; there’s more air PLUS water above you!
54BarometerAn instrument used to measure atmospheric pressure.
55Buoyancy The ability to float. The buoyant force acts in the direction opposite to the force of gravity, so it makes an object feel lighter.
56Archimedes’ Principle The buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces.
57Pascal’s PrincipleWhen force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid.A HYDRAULIC SYSTEM multiplies force by applying the force to a small surface area; the increase in pressure is then transmitted to another part of the confined fluid, which pushes on a larger surface area.
58Bernoulli’s Principle As the speed of a moving fluid increases, the pressure within the fluid decreases.LIFT = an upward force