EmSAT EmSAT Physics 2

Question 1

What is the formula for kinetic energy?

Accepted Answer

KE = ½mv²

Answer

Kinetic energy is KE = ½mv², where m is mass (kg) and v is velocity (m/s). It is the energy an object possesses due to its motion.

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

PE = mgh = 2 × 10 × 5 = 100 J. Gravitational potential energy depends on mass, gravity, and height.

Question 3

What is the law of conservation of energy?

Accepted Answer

Total energy in a closed system remains constant

Answer

The law of conservation of energy states that energy cannot be created or destroyed; it can only be transformed from one form to another. The total energy in a closed system remains constant.

Question 4

What type of energy does a compressed spring possess?

Accepted Answer

Elastic potential energy

Answer

A compressed spring stores elastic potential energy. When released, this energy converts to kinetic energy as the spring returns to its natural shape.

Question 5

What is the unit of energy?

Accepted Answer

Joule

Answer

The SI unit of energy is the Joule (J), defined as 1 kg·m²/s². The watt (W) is the unit of power (energy per unit time).

EmSAT Practice Test

EmSAT Practice Test

EmSAT EmSAT Physics 2