Newton's First Law of Motion

Describe the motion of a person not wearing a seat belt if the car stops suddenly.

• The person and car will stop together. 

• The person will stop faster than the car because they are lighter.

• The car will stop and the person will keep moving forward because of inertia 

• The car will stop and the person will speed up. 

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A boy is skateboarding when his board hits a rock in the road that immediately stops the board. What will happen to the boy?

• The boy's inertia will cause him to fall forward.

• Gravity will pull down on the board causing the boy to fall straight down.

• As the force of the rock stops the board, the boy's reaction will be to fall backward.

• The force of the boy will be greater than the force of the board, so the boy will stay upright.

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8 N to the left , and 4 N to the right. Find the net force. Is this balanced?

• 12 N Right  No

• 4 N Left  No

• 12 N Right  Yes

• 4 N Left  Yes

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What object has more Inertia?

• A Fly

• A Truck

• A Wheel

• A Car

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Newton's 1st Law is know as the law of _____.

• staying in motion

• staying at rest

• balanced forces

• inertia

What is Newton's 1st Law?

• Every action has an equal but opposite reaction.

• Objects never accelerate, they only move at a constant velocity (or at rest).

• Objects at rest remain at rest, objects in motion remain in motion, at a constant velocity, unless acted upon by an unbalanced force.

• Objects will accelerate, unless acted upon by an unbalanced force.

While you’re ice-skating with your friends, you push off from one end of the rink and slide forward. Based on Newton’s first law of motion, what is true?

• You will lose your balance and fall over before you reach the middle of the ice rink.

• You will continue to slide across the ice until a force makes you stop or change direction.

• The force of gravity will make you keep your velocity until your friends make you stop.

• The size of your ice skates will determine how quickly or slowly you travel across the ice

Inertia is the tendency for objects to resist change in their _____.

• mass

• state of being

• state of motion

• location

All of the following statements are true. Which of them is NOT explained by Newton's first law of motion?

• Dropping a box causes it to accelerate downwards.

• If I'm riding a skateboard, it doesn't spontaneously reverse directions.

• A baseball thrown in space will keep moving in the same direction until it hits something.

• A book lying on a desk doesn't start moving without an external force.

• A ball rolling straight down a tilted plane hill won't veer left or right unless something pushes it.

Two books are laying on a table top. With out picking them up how could you determine which has the greatest inertia?

• It is impossible to tell.

• Look at them... the larger one will have the greatest inertia.

• Give each one a push... the one that doesn't move very far (as compared to the other one) has more mass thus more inertia.

• Neither one has inertia... they are not moving.

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