Mechanical Aptitude Test Mechanical Aptitude Forces and Motion Principles 1

Question 1

A 5 kg cart is pulled by a rope exerting 30 N of force. Friction opposes the motion with 5 N. What is the acceleration of the cart?

Accepted Answer

5 m/s²

Answer

6 m/s²

Answer

4 m/s²

Answer

7 m/s²

Question 2

A 1,200 kg car decelerates from 20 m/s to a complete stop in 4 seconds. What average braking force was applied?

Accepted Answer

6,000 N

Answer

3,000 N

Answer

4,800 N

Answer

9,600 N

Question 3

A 2 kg ball is dropped from rest and falls freely for 3 seconds (g = 10 m/s²). What is its velocity just before it hits the ground?

Accepted Answer

30 m/s

Answer

10 m/s

Answer

20 m/s

Answer

60 m/s

Question 4

Three forces act on a single object: 40 N east, 40 N west, and 20 N north. What is the net resultant force?

Accepted Answer

20 N north

Answer

0 N

Answer

80 N east

Answer

100 N northeast

Question 5

A stationary 8 kg block has a constant 24 N force applied to it. How far does it travel in 3 seconds?

Accepted Answer

13.5 m

Answer

9 m

Answer

27 m

Answer

36 m

Question 6

A rocket in space fires its engine, expelling exhaust gases backward. According to Newton's third law, what happens to the rocket?

Accepted Answer

It accelerates forward with a force equal in magnitude to the exhaust thrust

Answer

It remains stationary because there is nothing to push against in space

Answer

It decelerates because it loses mass as fuel is expelled

Answer

It moves sideways due to the rotation of expelled gases