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8 th Science Force, Motion, and Energy

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A:B: ForceWeight C:D: AccelerationAir resistance #1 A push or pull.

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A. Force

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A:B: AccelerationAir resistance C:D: FrictionInertia 2 #2 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: Air resistanceInertia C:D: ForceNewton #3 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 #4 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: 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 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: Rocket at rest on a launch pad Ex: Golf ball sitting on a tee

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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 #6 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 #7 Every action has an equal and opposite reaction. Ex: Rocket launching. Ex: Bouncing a basketball

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C. Law 3 – Law of Action and Reaction

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A:B: F = 180 kgF = 180 N #8 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: 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 #9 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 #10 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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