Unit 1 Lesson 2 - Forces Can Change Motion

A stroller is pushed on a flat, smooth surface. How will the motion change if it is rolled on beach sand?

• The stroller will move more slowly

• The stroller will speed up

• The stroller will go a greater distance

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NGSS.MS-PS2-2

Match the following

• position

• an object's position changing

• motion

• the way an object faces

• distance

• how far something travels

• direction

• the exact place of an object

A ball falling back to the ground is an example of which force?

• magnetism

• gravity

• electricity

• attraction

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NGSS.MS-PS2-4

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What does friction cause?

• It makes things speed up.

• It makes things slow down or stop.

• It make things fall to the ground.

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NGSS.MS-PS2-2

Without friction a toy car would ----

• keep going and going.

• stop right away.

• stay at rest all the time.

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NGSS.MS-PS2-1

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Force that works against the motion between 2 surfaces

• force
• Newton
• friction
• net force

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

Traction helps us stick or grip surfaces....

• True

• False

Activities like sledding, skateboarding, skiing, snowboarding, and surfing enjoy...

• reducing friction so that they can move faster!

• increasing friction so that they can move slower.

• great amounts of friction to prevent movement.

• having no friction so that they never have to stop.

One way to reduce the friction on a sled, so that it will move faster downhill is to...

• add sand to the bottom of their sleds.

• add pebbles to the bottom of their sled.

• wax the bottom of their sled.

• glue gritty sand paper to the bottom of their sled.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2