# Newtons First Law of Motion :Inertia

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While ice skating with your friend , you push off from one end of the rink and slide forward. Based on Newtons first law of motion, what is true?

You will continue to slide across the ice until a force makes you stop or change directions
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How is velocity different from speed?

Velocity is speed and direction together
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What does friction do to a moving object?

Slow it down
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Your friend kicks a soccer ball, and it stops a few feet from you. What needs to happen to it in order for it to return to your friend?

Force has to be applied to the ball
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What is the relationship between heavy objects and inertia?

Heavy objects have more inertia
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You are riding in the car with your grandfather, and he turns left. Why do you shift to the right?

It takes you a while to catch up with the new velocity of the car
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What does the second part of newtons law say about objects at rest?

They will stay at rest unless acted on by an outside force
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Which of these can cause a moving object to change direction?

Force
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What is gravitational force?

The force of attraction between ant two objects
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What is an objects center of gravity ?

The exact center of its mass
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A paperclip and a computer are sitting on your desk. What is true about the gravitational force of these two objects?

The computer and the paper clip attract with equal gravitational force
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Why don’t we see the ground coming toward us?

We have less mass than the Earth
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:Why doesn’t the moon crash into the earth?

It has lots of mass, so it feels the Earths gravitational force less than smaller objects
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Why is it impossible to defy gravity?

Gravitational force exists every place where there are two objects
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Firefighters use ___ to control how fast they fall.

friction
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Friction can turn work into ____.

heat
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Friction is what holds all ___ together. (Like on your shoelaces!)

knots
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fingers
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People wear __ or cleats when playing sports so that they can get more (friction), making it easier to stop.

spikes
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Hockey skates side because they make a layer of liquid __ between the skate and the ice. This creates very little fiction between the skate and the ice.

water
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Would dancing be possible without friction?

No
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When you are on a bike, friction is what holds your __ on the pedals

feet
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Even though a bowling __ is smooth and the alley is smooth, there is still (friction) between them

ball
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To get something as __ and heavy as a train moving, we use (friction) to get it going.

big
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When a spacecraft reenters Earth’s atmosphere, friction causes the outside of the spacecraft to get extremely __.

hot
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Our joints are ___ to reduce wear and tear on our bones.

packed
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Slugs produce ___ to help reduce the friction between the animal’s body and the ground.

mucus
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Airplanes have smooth shapes to reduce __.