# 8 th Science Force, Motion, and Energy A:B: ForceWeight C:D: AccelerationVelocity #1 What is speed plus direction? Example: Geese fly about 64 km/hr.

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8 th Science Force, Motion, and Energy

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

D. Velocity

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 #2 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?

A. One of the forces is stronger than the other

A:B: NewtonsMeters #3 Which unit measures the Unit of Force? C:D: Secondsm/s 2

A. Newtons

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 #4 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

A.Law 1 – Law of Inertia

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 #5 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

B. Law 2 – Law of Acceleration

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 #6 Every action has an equal and opposite reaction. Ex: Rocket launching.

C. Law 3 – Law of Action and Reaction

A:B: S = 38 km/hrS = 38 hrs #7 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

A. S = 38 km/hr

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 #8 Calculating net force. What would be the net force in this diagram? 16N – 10N = 6N

A. Box will move to the left 6N

A:B: 150m/s 250m/s C:D: 1400m/s None of these #9 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

B. 250m/s

A:B: Stopped Ran faster C:D: Jogging slower None of these #10 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?

A. Stopped

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