Forces and Motion

Raoul threw a ball into the air and watched it go up for a long time. Then it started to fall back toward him. What force caused the ball to start to move downward?

• friction
• gravity
• motion 
• wind

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NGSS.MS-PS2-2

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Many types of forces can affect an object. Which of these is an example of a force being applied?

• watching TV
• pulling a wagon
• reading a book
• standing at the top of a hill

Look at the people on the swings in the following illustration.
The two boys are about to use the same force to push the people on the swings. Which of the following describes what will happen? 

• The parent will swing higher that the child
• The parent will accelerate more quickly that the child
• The child will accelerate more quickly that the parent
• The parent and the child will accelerate at the same rate

When you coast down a hill on a bicycle, you move faster and faster. Then when you keep coasting on a level surface, you eventually stop moving. What causes you to stop?

• No force is acting on your bike on the level surface, so it stops moving
• After you reach the bottom of the hill, you run out of energy, so you stop moving
• Friction between the tires and the ground is an unbalanced force that changes your motion
• Gravity affects you when you move downhill, but there is not gravity when you move on a level surface

The amount of friction exerted when an object moves across a surface depends on how the object and the surface rub together. For which of these surfaces will friction be greatest when a block of wood slides across it?

• wet ice
• glass mirror
• thick carpet
• waxed wood

What does it mean when a force is unbalanced?

• the motion changes
• the motion does not change

What is a PUSH or PULL of an object?

• Motion
• Force
• Friction
• Gravity

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NGSS.MS-PS2-1

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Why is it harder for the boy in Image B to get down the hill?

• Motion
• Friction
• Work
• Displacement

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NGSS.MS-PS2-2

Why does a rolling ball stop?

• Gravity
• Friction
• Waterfalls
• Sand

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NGSS.MS-PS2-2

If you pull the cord, what direction will the box move?

• Up
• Down
• Left
• Right

Tags

NGSS.MS-PS2-2