Lessons on Forces

According to Newton's second law of motion, what is the relationship between acceleration and mass? Acceleration:

• Is directly proportional to mass
• Is inversely proportional to mass
• Does not depend on mass
• Is always divided by mass

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NGSS.HS-PS2-1

If an object has an normal force of 80N what is its mass?

• 8.15 kg
• 80 kg
• 784.8 N
• not enough information

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NGSS.HS-PS2-1

A rock is falling towards the earth. The action and reaction pair is

• The earth pulls the rock downward, the rock pushes the earth upward
• The earth pushes the rock downward, the rock pushes the earth downward
• The rock pulls the earth upward, the earth pushes the rock upward
• The earth pulls the rock downward, the rock pulls the earth upward

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NGSS.HS-PS2-4

A 70 kg acrobat hangs from a bar, motionless, that is attached to the ceiling by two ropes. Find the tension in each rope.

• 70 N
• 686.7 N
• 343.35 kg
• 343.35 N

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

A 80 kg skydiver is free falling at a constant velocity of 19 m/s. What is the net (total) force acting on her?

• 1,520 N
• 0 N
• 4.21 N
• Not enough information to answer

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NGSS.HS-PS2-1

A 3 kg fish hangs from a fishing line, at rest. What is the tension in the string

• 3 N
• 29.43 N
• 29.43 kg 
• 3.27 N

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

When an object is on an inclined plane what is the force holding the object from sliding down?

• gravity
• normal
• friction
• applied force

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NGSS.HS-PS2-4

A 400 kg car rests in the drive way. Calculate the normal force acting on the car?

• 400 N
• 3,924 N
• 40.77 N
• Not enough information 

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NGSS.HS-PS2-1

Inertia is...

• The tendency of an object to resist changes in acceleration
• The tendency of an object to resist changes in velocity
• The tendency of an object to change its acceleration
• Objects in motion stay in motion, objects at rest stay at rest

Newton’s third law states: for every action, there is an equal and opposite reaction. Explain why, then, a cannon does not go as far as backward as a cannonball goes forward.

• The cannonball has less mass, and mass and acceleration are inversely proportional
• The cannon has less mass, and mass and acceleration are inversely proportional
• The cannonball has less mass, and mass and acceleration are directly proportional
• Newton's third law does not always apply

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NGSS.HS-PS2-1

NGSS.HS-PS2-2