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What is the efficiency of a machine that performs 500 J of work with an input of 1000 J? Mark only one oval.

• 25%

• 50%

• 75%

• 100%

What is the mechanical advantage of a lever system where the output force is 200 N and the input force is 50 N?

• 0.25

• 0.5

• 2

• 4

If a 5 kg object is lifted to a height of 10 m, what is its gravitational potential energy?

• 55 J

• 125 J

• 490 J

• 880 J

What is the velocity of a 12 kg object that has kinetic energy of 2400J?

• 1 m/s

• 10 m/s

• 20 m/s

• 35 m/s

A motor consumes 3,600,000 J in 2 hours. What is the power of the motor?

• 100 W

• 200 W

• 400 W

• 500 W

250 J of work is done over a distance of 5 m. What was the force applied?

• 1250 N

• 50 N

• 100 N

• 25 N

What force is required to accelerate a 10 kg mass at 5 m/s²?

• 2 N

• 5 N

• 10 N

• 50 N

A machine lifts 20 kg 3 meters if you have to put 700 J of work into the machine what is the efficiency?

• 17 %

• 84 %

• 119 %

• 127 %

If the efficiency of a machine is 80%, what fraction of the input work is lost?

• 0.2

• 0.4

• 0.6

• 0.8

A machine with an efficiency of 60% requires an input of 500 J. How much work does it perform?

• 200 J

• 300 J

• 500 J

• 833 J