EmSAT EmSAT Physics 2

Question 1

What is the formula for kinetic energy?

Accepted Answer

KE = ½mv²

Answer

KE = mgh

Answer

KE = Fd

Answer

KE = mv

Question 2

A 2 kg object is lifted 5 m. What is its gravitational potential energy? (g = 10 m/s²)

Accepted Answer

100 J

Answer

10 J

Answer

50 J

Answer

20 J

Question 3

What is the law of conservation of energy?

Accepted Answer

Total energy in a closed system remains constant

Answer

Energy can be created from nothing

Answer

Energy is always lost as heat

Answer

Force equals mass times acceleration

Question 4

What type of energy does a compressed spring possess?

Accepted Answer

Elastic potential energy

Answer

Kinetic energy

Answer

Thermal energy

Answer

Chemical energy

Question 5

What is the unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Pascal

Question 6

A machine does 500 J of work in 10 seconds. What is its power?

Accepted Answer

50 W

Answer

5000 W

Answer

500 W

Answer

5 W