Mistar 6.4 Forces

What is the equation for Newton's second law?

• S=d/t

• a= (final velocity-initial velocity)/time

• d=s*t

• F=m*a

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NGSS.MS-PS2-2

Jessica is comparing two balls. One ball has a mass of 1 kg, and the other has a mass of 2 kg. She pushes each with a force of 100 N. How do the accelerations of the two balls compare?

• The 1 kg ball accelerates the same as the 2 kg ball.

• The 1 kg ball accelerates half as much as the 2 kg ball

• The 1 kg ball accelerates twice as much as the 2 kg ball.

• The 1 kg ball accelerates four times as much as the 2 kg ball.

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NGSS.MS-PS2-2

A fisherman steps off a boat, which is in the water, onto a dock. What happens?

• The boat and the dock do not move

• The boat moves toward the dock

• The boat moves away from the dock

• The dock moves away from the boat.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

When two objects having different masses collide, they move away from each other at different speeds. Which is true of the forces exerted at the moment of impact?

• The forces exerted when they collide are equal and opposing

• The forces exerted when they collide are unequal and opposing.

• The forces exerted when they collide are equal and in the same direction

• The forces exerted when they collide are unequal and in the same direction

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NGSS.MS-PS2-1

Two EQUAL forces act in opposite directions on object A. Two UNEQUAL forces act in opposite directions on object B. If these are the only force acting on objects A and B which of these conclusions is true.

• Only object A will accelerate

• Only object B will accelerate

• Both object A and object B will accelerate

• Neither object A nor object B will accelerate

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NGSS.MS-PS2-2

A 1 kg object accelerates at a rate of 5 m/s^2. Calculate the net force on the object and explain how its motion is changing.

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NGSS.MS-PS2-2

Two ice skaters push away from each other. What will be the effect of the forces of their pushing each other if their masses are different?

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Pick a sport or activity (i.e.- basketball, gymnastics, track...) Using your knowledge of Newton's 3 Laws of Motion, give an example for each law in that specific activity.

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NGSS.MS-PS2-1

What type of force is this man using to push his grocery cart?

• Normal Force

• Gravity

• Air Resistance

• Applied Force

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the net force?

• 3 N

• 3 N, right

• 17 N, right

• 3 N, left

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NGSS.MS-PS2-1

NGSS.MS-PS2-2