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8 th Science Force, Motion, and Energy

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A:B: ForceWeight C:D: AccelerationVelocity #1 What is speed plus direction? Example: Geese fly about 64 km/hr when they migrate south.

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D. Velocity

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A:B: ForceWeight C:D: AccelerationAir resistance #2 A push or pull.

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A. Force

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A:B: AccelerationAir resistance C:D: FrictionInertia 2 #3 What is a change in motion? (Speeding up, slowing down, changing direction). Example: An airplane slows down at a rate of 3 m/s

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A. Acceleration

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A:B: It takes energy to make force Force causes motion #4 What is the relationship between force, motion, and energy? C:D: NeitherBoth

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D. Both A and B

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A:B: Air resistanceFriction #5 A force that resists motion. C:D: InertiaForce

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B. Friction

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A:B: Air resistanceInertia C:D: ForceNewton #6 A measure of an object’s tendency to remain at rest or to keep moving with a constant velocity.

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B. Inertia

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A:B: One of the forces is stronger than the other Both forces are equal C:D: Unbalanced forces cancel each other out, so there is no change Force #7 Forces occur in pairs and each pair of forces can be either balanced or unbalanced. How can an unbalanced force change the speed or direction of an object in motion?

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A. One of the forces is stronger than the other

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A:B: NewtonsMeters #8 Which unit measures the Unit of Force? C:D: Secondsm/s 2

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A. Newtons

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A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation #9 An object a rest remains at rest and an object in motion remains in motion at a constant speed unless acted upon by a unbalanced force. Ex: Seat belt Ex: pulling the table cloth out from under dishes

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A.Law 1 – Law of Inertia

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A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation #10 An object acted on by an unbalanced force will accelerate in the direction of the force. *(More force is required to move more mass.) Ex: It takes more force to move a car than a bicycle

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B. Law 2 – Law of Acceleration

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A:B: Law 1 – Law of InertiaLaw 2 – Law of Acceleration C:D: Law 3 – Law of Action and Reaction Law 4 – Law of Conservation #11 Every action has an equal and opposite reaction. Ex: Rocket launching.

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C. Law 3 – Law of Action and Reaction

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A:B: S = 38 km/hrS = 38 hrs #12 Measure Speed What is your speed if you travel 114 km in 3 hours? Speed = Distance Time C:D: S = 38 kmS = 3 km/hr

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A. S = 38 km/hr

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A:B: F = 180 kgF = 180 N #13 Measure Force What force is needed to make a 36 kg object accelerate to 5 m/s ? Force = mass x acceleration C:D: F = 108 NF = 180 m/s 2 2

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B. F = 180 N

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A:B: W = 300 NW = 300 M #14 How does force effect work? Work = Force x Distance (if no distance, no work) How much work would it take to move a 50 N box over 6 meters? C:D: W = 300 jW = 300 km

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C. 300 j

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A:B: They don’t change force or work They increase force or work C:D: They decrease force or distance None of these #15 How do simple machines effect force or distance?

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C. They decrease force or distance

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A:B: There is no force or gravity There is no friction or gravity C:D: There is no friction or newton There is no weight or mass #16 Why can a spacecraft travel in space at a constant speed and in a straight path?

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B. There is no friction or gravity

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A:B: Box will move to the left 6N Box will move to the right 6 N C:D: The force is balanced None of these #17 Calculating net force. What would be the net force in this diagram? 16N – 10N = 6N

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A. Box will move to the left 6N

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A:B: 150m/s 250m/s C:D: 1400m/s None of these #18 This graph relates distance to time for a jogger. Distance vs. Time At what rate of speed is Juan running between 4 min and 6 min? S= 500m/2min

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B. 250m/s

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A:B: Stopped Ran faster C:D: Jogging slower None of these #19 This graph relates distance to time for a jogger. Distance vs. Time What can you tell about Juan’s motion between 7 and 11 min?

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A. Stopped

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A:B: Light energy to chemical energy to electrical energy Sound energy to light energy to chemical energy C:D: Chemical energy to electrical energy to light energy None of these #20 *Energy transfer from one form to another. List, in order, three of the energy conversions that are present in this picture.

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C. Chemical energy to electrical energy to light energy

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A:B: No energy is disappears. Energy is just changed to another form Not all energy must be converted C:D: Both of these None of these #21 The Law of conservation of change states that matter cannot be created or destroyed. How does the Law of Conservation of Change apply to a flashlight?

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A. No energy is disappears. Energy is just changed to another form

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A:B: Motion energyStored energy #22 What is potential energy? C:D: Electrical energyNone of these

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B. Stored energy

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A:B: Motion energyStored energy #23 What is kinetic energy? C:D: Electrical energyNone of these

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A. Motion energy

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A:B: Energy can convert from kinetic to potential and back again They are not related C:D: Both are energy in motion None of these #24 How are potential energy and kinetic energy related?

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A. Energy can convert from kinetic to potential and back again

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A:B: Graph A Graph B C:D: Graph CNone of these #25 Which of these graphs shows a speed that is not changing (constant speed)

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C. Graph C

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Force and Motion Newton’s First Law 8th Grade Science

Force and Motion Newton’s First Law 8th Grade Science

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