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If a car’s speed is tripled, how does its kinetic energy change?
A. It increases by a factor of 9
B. It increases by a factor of 3
C. It increases by a factor of 6
D. It remains the same
Answer: It increases by a factor of 9
The rate of doing work or transferring energy is known as:
A. Power
B. Work
C. Energy
D. Force
Answer: Power
The energy associated with the movement of an object is called:
A. Kinetic energy
B. Potential energy
C. Chemical energy
D. Thermal energy
Answer: Kinetic energy
The work done by lifting an object to a height is stored as:
A. Kinetic energy
B. Elastic potential energy
C. Gravitational potential energy
D. Thermal energy
Answer: Gravitational potential energy
Which of the following is not a type of energy?
A. Nuclear energy
B. Elastic energy
C. Magnetic energy
D. Chemical energy
Answer: Magnetic energy
The efficiency of a machine is 90% and it does 450 J of useful work. What is the total work input?
A. 500 J
B. 405 J
C. 450 J
D. 90 J
Answer: 500 J
The energy of a system at rest due to its position is called:
A. Kinetic energy
B. Potential energy
C. Thermal energy
D. Mechanical energy
Answer: Potential energy
A machine that increases force but decreases distance is called a:
A. Lever
B. Pulley
C. Inclined plane
D. Wedge
Answer: Lever
If the mass of an object is doubled and its velocity is halved, what happens to its kinetic energy?
A. It is halved
B. It remains the same
C. It is doubled
D. It is quartered
Answer: It is quartered