Mechanical Aptitude Mechanical Aptitude Forces and Motion Principles 4

Question 1

A spring with a spring constant of 200 N/m is compressed by 0.05 m. What force does it exert?

Accepted Answer

10 N

Answer

Hooke's Law: F = kx = 200 N/m × 0.05 m = 10 N.

Question 2

When is the mechanical advantage of a simple machine greater than 1?

Accepted Answer

When the output force is greater than the input force

Answer

Mechanical advantage > 1 means the machine multiplies force, so output force exceeds input force.

Question 3

A pendulum swings back and forth. At which point in its swing is kinetic energy greatest?

Accepted Answer

At the lowest point of the swing

Answer

Kinetic energy is maximum at the lowest point where potential energy is minimum and speed is greatest.

Question 4

Two ice skaters push off from each other. Skater A has twice the mass of Skater B. Which statement is true?

Accepted Answer

Skater B moves faster

Answer

By conservation of momentum, the lighter Skater B receives the same force but has less mass, so it gains greater velocity.

Question 5

What is the unit of momentum?

Accepted Answer

Kilogram-meter per second (kg·m/s)

Answer

Momentum = mass × velocity, so its unit is kg·m/s.

Mechanical Aptitude Test Practice Test