Energy and Motion

Study Jams: Force and Motion

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What is force and motion?

Anytime there is a change in motion, force is the responsible party. It has to overcome inertia to act on an object. Inertia keeps an object either sitting still or moving at a constant speed.

Vocabulary

• Force: any action that changes the shape or movement of an object

• Inertia: an object's resistance to any change in motion

• Friction: the force that slows down objects when they rub up against each other.

Notes

• an object in motion will stay in motion unless acted upon by another force

• the more friction there is, the more force you need to apply

• greater force = greater change in movement

• a force is a push or pull that acts on an object

• we need forces to set objects in motion

Multiple Choice

What would you need to move a soccer ball?

• friction

• gravity

• force

• inertia

Multiple Choice

Which of these is an example of force?

• watching a slice of bread in the toaster

• pulling a casserole out of the oven

• listening to your school chorus

• taste testing soup cooking on the stovetop

Multiple Choice

Which object would require the most amount of energy, or force, to set it into motion?

• a school bus

• a refrigerator

• a microwave

• a houseplant

Multiple Choice

Your older brother tells you his paper airplane has inertia. What does this mean?

• It has too much resistance to fly more than a few feet from his hand.

• It is too heavy to stay in the air for more than a few seconds.

• It will require a lot of force to get it to fly.

• It will stay in flight unless something stops it, or it will stay still unless something moves it.

Multiple Choice

What is the name of the unit you use to measure force?

• Neutron

• Norton

• Nucleus

• Newton

Multiple Choice

Why don’t skateboarders keep flying through the air when they launch off a ramp?

• The force of gravity works against the skateboarders’ inertia.

• Skateboard wheels don’t spin fast enough to keep them moving very far.

• The skateboarders have no inertia when they launch off a ramp.

• Skateboards do not use Newtons to move around ramps.

Multiple Choice

What is an example of friction?

• slipping on a patch of ice

• dropping a book on the floor

• diving into a swimming pool

• wind blowing against you as you walk