Force, Motion and Newton's Laws

Which force produces a change in motion?

• unbalanced force
• balanced force
• gravitational force
• frictional force

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If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration?  (F=ma)

• The one with a mass of .78 kg will have the greatest acceleration.
• The one with a mass of .52 kg will have the greatest acceleration.
• They will both accelerate at the same rate.

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A 20 kg bike accelerates at 10 m/s².  what was the force?

• 25 Newtons
• 20 Newtons
• 200 Newtons
• 10 Newtons

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A student pushes a box to right with a force of 10N while a young boy pushes the box to the left with a force of 8N. What is the sum of all forces on the box? 

• 18N left
• 18N right
• 2N right
• 2N left

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NGSS.MS-PS2-2

A car speeding up, a dog slowing down and person turning around the block are examples of..

• Balanced Forces
• Unbalanced Forces

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What is Newton's First Law

• F=ma
• Every action has an equal and opposite reaction
• An object at rest stays at rest, an object in motion stays in motion. 
• Friction 

Which of Newton's laws is illustrated when a magician pulls a tablecloth out from under the dishes without disturbing them?

• first
• second
• third 
• fourth

A person is pushed forward into their seat belt when a car stops.  Which law is this?

• 1st
•  2nd
• 2 and 3
• 3rd 

When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force?

• The cannon moving forward
• The cannonball moving forward
• The cannon moving backward
• The cannonball moving backward

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A bike accelerates at 10 m/s² when a force of 50N is applied.  What is the mass of the bike and its rider?

• 25 kg
• 200 kg
• 20 kg
• 5 kg

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