During a demonstration of Newton’s laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining on the index card?

The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

The card had less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

A bowling ball is rolled with a certain speed and strikes a bowling pin with a force indicated by the arrow in this illustration. When the bowling ball strikes the bowling pin, the force applied by the pin to the ball -

is equal to the force applied by the ball.

depends on the mass of the bowling pin.

must be zero, since the pin is not moving.

is equal to the force of gravity on both.

When is the speed of a roller coaster the fastest?

As it moves towards the bottom of the hill

If the action force is the rails of the roller coaster on the cart. The reaction is

the force of the cart on the roller coaster

When does a roller coaster car accelerate?

both when it turns or changes it speed

only when it speeds up down the hill

The Free Body Diagram above shows the forces acting on a hockey puck in motion to the right. Which of the following describe the motion of the hockey puck?

the hockey puck moves to the right with constant velocity

the hockey puck is slowing down

the hockey puck moves is a circle

A group of pirates fire a cannon. They notice that when a cannon ball is fired from the cannon, the cannon rolls backwards. The cannon is much more massive than the cannon-ball. Which of the following best explains why the cannon rolls backwards?

there is an equal force on the cannon but in the opposite direction of the force on the cannon-ball.

the force that is exerted on the cannon ball is so great some is reflected back on the cannon

the inertia of the cannon causes it to roll backwards when the mass changes

the cannon ball’s energy is released to the cannon

Newton's Laws Review

Authored by Brittany Gonzalez

Science

8th Grade

NGSS covered

Used 34+ times

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MULTIPLE CHOICE QUESTION

20 sec • 1 pt

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MULTIPLE CHOICE QUESTION

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

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MULTIPLE CHOICE QUESTION

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NGSS.MS-PS3-5

MULTIPLE CHOICE QUESTION

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What law is best described by inertia?

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F = MxA

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NGSS.MS-PS2-2

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Newton's Laws Review

What law is best described by inertia?

F = MxA

Object at rest stays at rest.

Acceleration is due to a force put on an objects mass.

Equal and Opposite

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