Mechanical Aptitude Mechanical Aptitude Forces and Motion Principles Questions and Answers 3

Question 1

According to Newton's third law, when a hammer strikes a nail, the nail exerts a force on the hammer that is:

Accepted Answer

Equal in magnitude and opposite in direction

Answer

Smaller because the nail is lighter

Answer

Greater because the nail decelerates the hammer

Answer

Zero because the nail doesn't move much

Question 2

A 1,200 kg car accelerates from 0 to 25 m/s in 10 seconds. What is the average net force acting on the car?

Accepted Answer

3,000 N

Answer

1,200 N

Answer

12,000 N

Answer

300 N

Question 3

A skydiver reaches terminal velocity during freefall. At terminal velocity, which statement is true?

Accepted Answer

Air resistance equals the skydiver's weight

Answer

Air resistance is greater than gravity

Answer

The skydiver is no longer affected by gravity

Answer

The skydiver is accelerating downward

Question 4

A forklift raises a 500 kg pallet at a constant speed. What upward force must the forklift exert?

Accepted Answer

4,900 N

Answer

More than 4,900 N

Answer

Less than 4,900 N

Answer

9,800 N

Question 5

A 2 kg ball rolling at 6 m/s on a flat surface has what amount of kinetic energy?

Accepted Answer

36 J

Answer

12 J

Answer

72 J

Answer

6 J

Question 6

An astronaut floating in the International Space Station pushes off a wall with 20 N of force. What happens to the astronaut?

Accepted Answer

The astronaut accelerates away from the wall

Answer

The astronaut remains stationary

Answer

The wall moves but the astronaut does not

Answer

Nothing happens in zero gravity