Mechanical Aptitude Forces and Motion Principles Flashcards
7 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mechanical Aptitude Forces and Motion Principles flashcards as text
A spring with a spring constant of 200 N/m is compressed by 0.05 m. What force does it exert?
Answer: 10 N
Hooke's Law: F = kx = 200 N/m × 0.05 m = 10 N.
When is the mechanical advantage of a simple machine greater than 1?
Answer: When the output force is greater than the input force
Mechanical advantage > 1 means the machine multiplies force, so output force exceeds input force.
A pendulum swings back and forth. At which point in its swing is kinetic energy greatest?
Answer: At the lowest point of the swing
Kinetic energy is maximum at the lowest point where potential energy is minimum and speed is greatest.
Two ice skaters push off from each other. Skater A has twice the mass of Skater B. Which statement is true?
Answer: Skater B moves faster
By conservation of momentum, the lighter Skater B receives the same force but has less mass, so it gains greater velocity.
What is the unit of momentum?
Answer: Kilogram-meter per second (kg·m/s)
Momentum = mass × velocity, so its unit is kg·m/s.
A machine has an input force of 50 N and an output force of 150 N. What is its mechanical advantage?
Answer: 3
Mechanical advantage = output force ÷ input force = 150 N ÷ 50 N = 3.
Friction between two surfaces is generally higher when:
Answer: The normal force is greater
Friction force = μ × normal force, so greater normal force directly increases friction.