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Which of the following best describes work done?
A. Force applied over a distance
B. Energy converted to heat
C. Energy stored in a spring
D. Power used over time
Answer: Force applied over a distance
The energy possessed by a stationary object at a height is called:
A. Potential energy
B. Kinetic energy
C. Thermal energy
D. Mechanical energy
Answer: Potential energy
The power of a machine that does 2000 J of work in 40 seconds is:
A. 50 W
B. 100 W
C. 200 W
D. 500 W
Answer: 50 W
The amount of work done by a force of 30 N moving an object 10 meters is:
A. 300 J
B. 30 J
C. 10 J
D. 3000 J
Answer: 300 J
The formula for calculating power is:
A. P = W/t
B. P = F × d
C. P = m × g
D. P = E × t
Answer: P = W/t
The energy stored in food is an example of:
A. Chemical energy
B. Kinetic energy
C. Thermal energy
D. Elastic potential energy
Answer: Chemical energy
The work done to lift a 15 kg object to a height of 4 meters is:
A. 600 J
B. 60 J
C. 150 J
D. 120 J
Answer: 600 J
The energy stored in a stretched bowstring is an example of:
A. Elastic potential energy
B. Kinetic energy
C. Gravitational potential energy
D. Thermal energy
Answer: Elastic potential energy
The energy possessed by an object due to its position in a gravitational field is:
A. Gravitational potential energy
B. Elastic potential energy
C. Kinetic energy
D. Thermal energy
Answer: Gravitational potential energy