OAR OAR Mechanical Comprehension: Forces Questions and Answers 3

Question 1

A 1,200 kg car accelerates from rest at 3 m/s². What net force is required to produce this acceleration?

Accepted Answer

3,600 N

Answer

400 N

Answer

1,200 N

Answer

12,000 N

Question 2

Three coplanar forces of 5 N, 3 N, and 7 N all act to the right on an object. What is the resultant force?

Accepted Answer

15 N to the right

Answer

5 N to the right

Answer

1 N to the left

Answer

9 N to the right

Question 3

A 20 kg crate requires 60 N of horizontal force to start sliding on a surface. What is the coefficient of static friction? (g = 10 m/s²)

Accepted Answer

0.3

Answer

0.6

Answer

3.0

Answer

0.03

Question 4

A 15 kg object is in free fall near Earth's surface. Ignoring air resistance, what is the net force on the object? (g = 9.8 m/s²)

Accepted Answer

147 N downward

Answer

15 N downward

Answer

9.8 N downward

Answer

0 N

Question 5

Two ropes support a 100 N weight. If the ropes make equal angles and each rope carries an equal share, what is the vertical component of tension in each rope?

Accepted Answer

50 N

Answer

100 N

Answer

25 N

Answer

75 N

Question 6

A force of 40 N is applied to a 10 kg block on a frictionless surface. After 5 seconds, what is the block's velocity if it starts from rest?

Accepted Answer

20 m/s

Answer

8 m/s

Answer

200 m/s

Answer

4 m/s