Force and Motion Review

Why do we need friction?

• It helps objects go faster. 
• It helps objects go up higher.
• It helps make objects go slower or stop.

What is Friction?

• How much something weighs
• When 2 objects slide against each other
• How fast something is going

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What are EQUAL forces acting on an object in opposite directions that do not change the object's motion?

• Friction
• Weight
• Balanced Forces
• Unbalanced Forces

If an object does not move at all, what does that mean about the forces acting on the object? 

• The forces are balanced. 
• The forces are unbalanced. 

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Is a force that pulls objects toward each other and down to the ground

• Force
• Friction
• Gravity
• weight

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Look at the image. What two forces are happening in this picture? 

• Friction & Magnetism
• Magnetism & Gravity
• Friction & Gravity

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It's field day and two classes are playing tug-of-war. One side has 4 people and the other side has 8 people. What is this an example of?

• balanced forces
• unbalanced forces

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A push or pull that can change the position or motion of an object/material is --

• magnetism

• motion

• force

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This picture shows two forces acting on a domino.  What do the arrows show? 

• Unbalanced forces, domino moves
• balanced forces, no movement 

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What happens to the gravitational force between objects as the objects move closer together?

• It has no pattern

• It does not change

• It increases

• It decreases

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