OAR OAR Mechanical Comprehension: Forces 2

Question 1

A 10 kg box is pushed across a frictionless surface with a net force of 30 N. What is the box's acceleration?

Accepted Answer

3 m/s²

Answer

0.33 m/s²

Answer

300 m/s²

Answer

20 m/s²

Question 2

Two forces act on an object: 15 N to the right and 9 N to the left. What is the magnitude and direction of the net force?

Accepted Answer

6 N to the right

Answer

24 N to the right

Answer

6 N to the left

Answer

24 N to the left

Question 3

Which of the following best describes a force couple?

Accepted Answer

Two equal and opposite forces that produce rotation

Answer

Two equal forces acting in the same direction

Answer

A single force that creates linear motion

Answer

Two forces that cancel each other out with no rotation

Question 4

An object is in static equilibrium. Which statement must be true?

Accepted Answer

The net force and net torque on it are both zero

Answer

The object is moving at constant velocity

Answer

All individual forces acting on it are zero

Answer

The object has no mass

Question 5

A 500 N person stands on a scale in an elevator accelerating upward at 2 m/s². What does the scale read? (g ≈ 10 m/s²)

Accepted Answer

600 N

Answer

500 N

Answer

400 N

Answer

1000 N

Question 6

If the coefficient of static friction between a box and a floor is 0.4 and the box weighs 200 N, what is the maximum static friction force?

Accepted Answer

80 N

Answer

500 N

Answer

200 N

Answer

0.4 N

Question 7

A block rests on a ramp inclined at 30°. Which component of gravity acts parallel to the ramp surface?

Accepted Answer

mg sin 30°

Answer

mg cos 30°

Answer

mg tan 30°

Answer

mg / sin 30°