Physics Forces Quiz 2

If the forces on a block are balanced, then it is safe to say that the block is:

• speeding up only.

• slowing down only.

• constant speed only.

• at rest only.

• constant speed or at rest.

Michelle ran out of gas and tried to push the car to the side of the road. She could not get it to move even though she was on a level surface, the brake was off, and the car was in neutral. Why wouldn't the car move?

• Michelle's forward push was smaller than the backward resistance of friction.

• Michelle's forward push was equal to the backward resistance of friction.

• If the car is not moving, then the force by Michelle must be zero.

• The force of inertia was simply too great for Michelle to overcome.

• Michelle's push could not overcome the force of gravity on the car.

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NGSS.MS-PS2-2

At hockey practice, Janine hit a puck across the ice. After it is no longer touching the stick, the puck continues to move because...

• there is a force of motion that keeps the puck going.

• the force from the stick continues to push the puck forward, but it eventually runs out.

• no force is needed for the puck to keep moving at a constant speed.

• ice is cold and slippery.

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NGSS.MS-PS2-2

After a lecture on forces in science class, Frank was thinking about the forces acting on a box at rest on his desk. Which statement do you think best represents the forces acting on the box?

• The force of gravity is the only force acting on the box.

• The downward pull of gravity is larger than the upward push of the desk.

• No forces act on the box at rest.

• Earth pulls down and the table pushes up equally on the box.

Frank is experimenting with a metal ball that he is holding up at the end of a string as shown. Which of the following is the best statement about the forces acting on the ball?

• Frank is pulling up on the ball.

• The ball hangs down tight on the string so the weight of the ball is greater than the pull of the string.

• The ball is not moving so there are no forces involved in this situation.

• The up force of the string is equal to the force of gravity on the ball.

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The force required to accelerate a 2-kg mass at 4 m/s/s is:

• 2 N

• 4 N

• 8 N

• 16 N

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A force of F newtons will give an object with a mass of M an acceleration of A. The same force will give a mass of 2 M an acceleration of:

• A/4

• A/2

• A

• 2A

• 4A

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NGSS.MS-PS2-2

On the planet Gamma a 4.0-kg mass experiences a gravitational force of 24 N. What is the acceleration due to gravity on Gamma?

• 0.17 m/s/s

• 6 m/s/s

• 9.8 m/s/s

• 96 m/s/s

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NGSS.MS-PS2-4

A cart is uniformly accelerating from rest. The net force on the cart must be:

• zero.

• constant.

• decreasing.

• increasing.

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In the graph, the acceleration of an object is plotted against the unbalanced force applied. What is the mass of the object?

• 0.2 kg

• 0.5 kg

• 2.0 kg

• 4.0 kg

• 5 kg

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NGSS.MS-PS2-2