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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: 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?

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A. One of the forces is stronger than the other

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A:B: NewtonsMeters #3 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 #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

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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 #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

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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 #6 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 #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

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A. S = 38 km/hr

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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 #8 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 #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

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B. 250m/s

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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?

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A. Stopped

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