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

Newton's third law states that action and reaction forces are always equal in magnitude and opposite in direction.

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

Average net force = mass × (change in velocity / time) = 1,200 × (25/10) = 3,000 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

At terminal velocity the drag force equals the gravitational force, resulting in zero net force and zero acceleration.

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

At constant speed the acceleration is zero, so the lifting force exactly equals the weight: 500 × 9.8 = 4,900 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

Kinetic energy = ½mv² = ½ × 2 × 6² = 36 J.

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