Mechanical Aptitude Forces and Motion Principles Questions and Answers Flashcards
6 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 6 Mechanical Aptitude Forces and Motion Principles Questions and Answers flashcards as text
According to Newton's third law, when a hammer strikes a nail, the nail exerts a force on the hammer that is:
Answer: Equal in magnitude and opposite in direction
Newton's third law states that action and reaction forces are always equal in magnitude and opposite in direction.
A 1,200 kg car accelerates from 0 to 25 m/s in 10 seconds. What is the average net force acting on the car?
Answer: 3,000 N
Average net force = mass × (change in velocity / time) = 1,200 × (25/10) = 3,000 N.
A skydiver reaches terminal velocity during freefall. At terminal velocity, which statement is true?
Answer: Air resistance equals the skydiver's weight
At terminal velocity the drag force equals the gravitational force, resulting in zero net force and zero acceleration.
A forklift raises a 500 kg pallet at a constant speed. What upward force must the forklift exert?
Answer: 4,900 N
At constant speed the acceleration is zero, so the lifting force exactly equals the weight: 500 × 9.8 = 4,900 N.
A 2 kg ball rolling at 6 m/s on a flat surface has what amount of kinetic energy?
Answer: 36 J
Kinetic energy = ½mv² = ½ × 2 × 6² = 36 J.
An astronaut floating in the International Space Station pushes off a wall with 20 N of force. What happens to the astronaut?
Answer: The astronaut accelerates away from the wall
By Newton's third law the wall pushes back on the astronaut with 20 N, accelerating the astronaut away.