Quiz about 8th Midterm Review

Question 1

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

Accepted Answer

100 Newtons, opposite direction

Answer

100 Newtons, same direction

Answer

200 Newtons, opposite direction

Answer

200 Newtons, same direction

Question 2

Newton's third law describes action and reaction forces. A table of four scenarios is provided. Which of the scenarios described in the table show equal and opposite reaction forces?

Accepted Answer

the rocket and the balloon

Answer

the balloon and the girl

Answer

the rocket and the train

Answer

the train and the girl

Question 3

The illustration shows the forces in Newtons (N) acting on three different blocks. Which blocks will experience a change in motion, or acceleration?

Accepted Answer

Blocks 2 and 3

Answer

Blocks 1 and 2

Answer

Blocks 1 and 3

Answer

Blocks 1, 2, and 3

Question 4

A student creates a ramp by stacking four blocks and then leaning a meter stick against it. She releases four different balls from the same position on the ramp and calculates their speeds. Based on the information in the table above, which ball would you predict to have the least kinetic energy when it reaches the end of the ramp?

Accepted Answer

Golf ball

Answer

Tennis ball

Answer

Baseball

Answer

Softball

Question 5

Students attached both ends of a long wire to the poles of a battery and wrapped the wire around a spoon. In this arrangement, the spoon is able to pick up five paper clips. The students wrap more wire around the spoon and want to determine if the strength of the magnetic force has increased. Which of the following observations would indicate that wrapping more wire has increased the strength of the electromagnet?

Accepted Answer

The spoon now picks up seven paper clips.

Answer

Eventually, the battery runs out of energy.

Answer

The ends of the wire must touch the battery's poles.

Answer

More wire was needed to wrap around the spoon.

Question 6

This table shows the magnitude of electromagnetic force exerted by two electromagnets on each other as the distance between the two electromagnets is varied. The data on the table provide evidence for which of the following conclusions?

Accepted Answer

The smaller the distance between two electromagnets, the greater the force.

Answer

As distance between electromagnets increases, the electromagnetic force also increases.

Answer

The force between two magnets depends only on the charge of the electromagnets.

Answer

The force between any two magnets is always constant, regardless of distance.

Question 7

A ringing bell makes noise inside a glass jar. Then the air is removed from the glass jar using a vacuum pump. When all of the air leaves the jar, the sound of the ringing bell can no longer be heard. Which of the following best explains why the students can no longer hear the bell?

Accepted Answer

The air in the jar provides a medium for the sound to travel through.

Answer

The differences in pressure inside and outside the glass jar is too great.

Answer

Removing the air from the jar allows the bell to ring only very softly.

Answer

The sound in the empty jar is reflected off the inside of the glass sides.

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