Friction and Net Force

Friction is a force that acts in a(n) ___________ direction relative to a moving object.

• similar
• opposite
• parallel
• perpendicular

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease.
• The marble’s speed would increase.
• The marble would stop immediately. 
• The marble would remain at a constant speed.

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How do you lower the friction force?

• By a smooth surface
• By a rough surface
• By not pushing hard
• By pushing down

What is the net force?  

• 0 N
• 10 N
• 25 N
• 5 N

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What is the net force and the direction of movement?  

• 13 N Toward Y
• 13 N Toward Z
• 7 N Toward Y
• 7 N Toward Z

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Does this combination of forces create a balanced or unbalanced net force?  

• Balanced
• Unbalanced

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With how much net force does this rocket leave the surface of Earth?

• 300 N

• 100 N

• 400 N

• 200 N

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What is the net force and in what direction will the block move?  

• 40 N Right
• 60 N Right
• 60 N Left
• 40 N Left

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What is the net force and the direction of movement?  

• 0 N No movement
• 7 N Right
• 2 N Right
• 2 N Left

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In order to determine the net force, would these forces have to be added or subtracted? 

• Added
• Subtracted

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