Force and Newton's Laws

Identify the REACTION force in this picture.

• The water pushes down on the ground/lake.

• The man goes up.

• The hose shoots out water.

• The ground pushes up on the water hose.

Answer explanation

The action is that the water pushes down on the ground. Flip it to find the REACTION.

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NGSS.MS-PS2-1

How could the man get HIGHER in the air?

• more force with the water hose

• less force with the water hose

• more gravity pulling down

Answer explanation

More force pushing down will push him up higher in the air. The reaction has to be equal and opposite.

Tags

NGSS.MS-PS2-2

If we increase the force of water pushing down, the force pushing up on the man will ____.

• increase

• decrease

• stay the same

Answer explanation

Newton's 3rd law says that the action and reaction forces must be equal.

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NGSS.MS-PS2-1

Which cart will take more force to move it?

• empty cart

• full cart

• they are the same

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NGSS.MS-PS2-2

If the carts bump together, which one will have more force?

• empty cart

• full cart

• they are the same

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

We measured the distance that the marble traveled. How can we get it to go farther? There is more than one right answer.

• increase the marble's mass

• decrease the marble's mass

• add more force to the marble

• make the ramp lower.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is inertia?

• resistance to change

• push or pull

• slowing down

• friction

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NGSS.MS-PS2-2

Which of the following would require the LEAST amount of force to move?

• A bowling ball

• A soccer ball

• A beach ball

TRUE or FALSE? The gravitational force between two objects decreases as the distance between them increases.

• true

• false

Two 15 kg objects are pulled along a frictionless surface by a 120 N force with an acceleration of 4 m/s^2. The tension of the string that joins the boxes is

• 4 N

• 8 N

• 60 N

• 120 N

• 240 N

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NGSS.MS-PS2-2