Newton's Laws, Free-Body Diagrams, & Hooke's Law

What is Newton's First Law?

• The restoring force of a spring is proportional to the displacement of the spring

• An object in motion will stay in motion unless acted on by an external force

• F = ma
  

• For every force, there's a force equal in magnitude but opposite in direction.

What is Newton's Second Law

• F = -kx

• F = ma

• F = mg

• F = mad

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NGSS.HS-PS2-1

What is Newton's Third Law?

• The restoring force of a spring is proportional to the displacement of the spring

• An object in motion will stay in motion unless acted on by an external force

• Object's have a tendency to resist changes in their motion
  

• For every force, there's a force equal in magnitude but opposite in direction.

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NGSS.MS-PS2-1

What is the weight of a person whose mass is 75 kg?

• 736 N

• 84.8 N

• 750 N

• 368 N

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

Based on the free-body diagram, which statement is true?

• The object is moving to the left

• The object is accelerating to the right

• The object is accelerating to the left

• The object is moving to the right

Tags

NGSS.HS-PS2-1

Block of cheese, B, has a mass of 0.5 kg and the wheel of cheese, W, has a mass of 0.4 kg. What is the tension in rope 1? Assume the acceleration is 0 m/s²

• 4.91 N

• 8.83 N

• 3.92 N

• 0.981 N

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

Based on this free-body diagram, which statement can you be sure is true?

• This object is not moving

• This object is moving to the right

• This object is accelerating to the left

• This object is accelerating to the right

Tags

NGSS.HS-PS2-1

Which equation is Hooke's Law?

• F = ma

• F = -kx

• F = mg

• F = -k / x

You place 16 N worth of bananas on the scale at the store. The scale drops 4 cm once it stops moving. What is the spring constant of this scale?

• 100 N/cm

• 300 N/m

• 400 N/m

• 400 N/cm

Hooke's Law states that the restoring force is (a)   to the displacement of the spring.