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

• Friction
• Weight
• Balanced Forces
• Unbalanced Forces

The force that two surfaces exert on each other when they rub against each other.

• Friction
• Gravity
• Weight
• Force

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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Ted was rolling a pencil on his desk and the pencil fell down to the ground. What force made this occur?

• Magnetism
• Gravity
• Friction

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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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What are UNEQUAL forces acting on an object in opposite directions that cause motion?

• Balanced Forces
• Unbalanced Forces
• 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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What is motion?

• A change in position.

• A change in force.

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