Force and Motion Review

What is air resistance?

• friction in the air that slows things down
• when an airplane flies into a cloud
• when you feel the air hitting your face

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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 kind of surface is a gravel and rocks?

• smooth
• rough

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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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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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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