Bennett Mechanical Test Bennett Mechanical Work and Energy Questions and Answers 2

Question 1

A 1000 W motor runs for 30 seconds. How much energy does it consume?

Accepted Answer

30,000 J

Answer

300 J

Answer

3,000 J

Answer

30 J

Question 2

Which form of energy is stored in a stretched rubber band?

Accepted Answer

Elastic potential energy

Answer

Kinetic energy

Answer

Thermal energy

Answer

Chemical energy

Question 3

A 2 kg object moves at 4 m/s. What is its kinetic energy?

Accepted Answer

16 J

Answer

8 J

Answer

32 J

Answer

4 J

Question 4

According to the law of conservation of energy, what happens to total energy in a closed system?

Accepted Answer

It remains constant

Answer

It increases

Answer

It decreases

Answer

It doubles

Question 5

A 60 W light bulb operates for 2 hours. How much energy does it consume?

Accepted Answer

432,000 J

Answer

120 J

Answer

7,200 J

Answer

60 J

Question 6

Work is only done on an object when an applied force causes what?

Accepted Answer

Displacement

Answer

A temperature change

Answer

An increase in mass

Answer

Vibration