Mechanical Aptitude Mechanical Aptitude Forces and Motion Principles 3

Question 1

A wrench applies a force of 30 N at a distance of 0.2 m from a bolt. What is the torque produced?

Accepted Answer

6 N·m

Answer

Torque = force × distance = 30 N × 0.2 m = 6 N·m.

Question 2

Which type of friction acts on an object that is sliding across a surface?

Accepted Answer

Kinetic friction

Answer

Kinetic (sliding) friction acts between surfaces in relative motion against each other.

Question 3

An object moving in a circle at constant speed is subject to a net force directed:

Accepted Answer

Toward the center

Answer

Centripetal force always points toward the center of the circular path.

Question 4

A 2 kg object moving at 4 m/s has a kinetic energy of:

Accepted Answer

16 J

Answer

KE = ½mv² = ½ × 2 × 4² = ½ × 2 × 16 = 16 J.

Question 5

Which of the following correctly states Newton's third law?

Accepted Answer

For every action there is an equal and opposite reaction

Answer

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

Mechanical Aptitude Test Practice Test