OAR OAR Mechanical Comprehension: Forces Questions and Answers 2

Question 1

A 10 kg box is pushed across a floor with a force of 50 N while friction exerts 20 N in the opposite direction. What is the net force acting on the box?

Accepted Answer

30 N in the direction of the push

Answer

Net force equals applied force minus friction: 50 N − 20 N = 30 N in the direction of the push.

Question 2

Two forces act on an object: 8 N to the east and 6 N to the north. What is the magnitude of the resultant force?

Accepted Answer

10 N

Answer

Using the Pythagorean theorem, the resultant is √(8² + 6²) = √(64 + 36) = √100 = 10 N.

Question 3

A 5 kg object hangs motionless from a rope attached to the ceiling. What is the tension in the rope? (g = 9.8 m/s²)

Accepted Answer

49 N

Answer

The tension equals the weight of the object: T = mg = 5 × 9.8 = 49 N.

Question 4

According to Newton's Third Law, when a hammer strikes a nail, how does the force the nail exerts on the hammer compare to the force the hammer exerts on the nail?

Accepted Answer

Equal in magnitude but opposite in direction

Answer

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

Question 5

A spring with a spring constant of 200 N/m is compressed 0.15 m from its natural length. What force does the spring exert?

Accepted Answer

30 N

Answer

By Hooke's Law, F = kx = 200 × 0.15 = 30 N.

OAR Test Practice Test

OAR Test Practice Test

OAR OAR Mechanical Comprehension: Forces Questions and Answers 2