Work And Energy

Question 1

Work Formula

Answer 1

Work = Force × Distance
W = F × S

Question 2

Unit of work

Answer 2

Newton meter (Nm)

Question 3

SI unit of work

Answer 3

Joule

Question 4

Scalar quantity

Answer 4

One characteristic

- Magnitude/size

Question 5

Vector quantity

Answer 5

Two characteristics

• Magnitude/size
• Direction

Question 6

Force is a …… quantity

Answer 6

Vector

Question 7

Kinetic Energy

Answer 7

Energy in Motion

Question 8

Potential Energy

Answer 8

Stored energy

Question 9

Energy

Answer 9

The ability to do work

Question 10

Work

Answer 10

Measure of energy transfer that occurs when an object is moved over a distance by an external force

Question 11

Kinetic Energy formula

Answer 11

KE = 1/2 mv^2

M = mass of the body
V = velocity (or speed) of the body

Question 12

Potential Energy Formula

Answer 12

PE = m × g × h

M = mass of the body 
G = acceleration due to gravity 
H = height of the body above a reference point, say the surface of the Earth.

Question 13

Power

Answer 13

The rate of doing work.
Or
The rate at which energy is consumed.

Question 14

Power formula

Answer 14

Power = Work done/time taken
Or
Power = Energy consumed/time taken

Question 15

Power is a ….. quantity

Answer 15

Scalar

Question 16

SI unit of power

Answer 16

Watt

Question 17

Law of conservation of energy

Answer 17

Whenever energy changes from one form to another, the total amount of energy remains constant. Energy can neither be created nor destroyed.

Question 18

How many types of energy are there?

Answer 18

8

Question 19

Types of energy

Answer 19

• Kinetic Energy
• Potential Energy
• Chemical Energy
• Heat Energy
• Light Energy
• Sound Energy
• Electrical Energy
• Nuclear Energy