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

70 N in the direction of the push

Answer

20 N opposite the push

Answer

50 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

14 N

Answer

2 N

Answer

7 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

5 N

Answer

25 N

Answer

98 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

Less because the nail is smaller

Answer

Greater because the nail decelerates the hammer

Answer

Zero because the nail moves

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

15 N

Answer

300 N

Answer

20 N

Question 6

An object weighing 80 N sits on a ramp inclined at 30° above the horizontal. What is the component of the gravitational force acting parallel to the ramp surface?

Accepted Answer

40 N

Answer

69.3 N

Answer

80 N

Answer

56.6 N