Energy 1.1

Question 1

What is the equation for kinetic energy

Answer 1

0.5 x Mass x (Velocity)”2

Question 2

What is the equation for elastic potential energy

Answer 2

0.5 x Spring Constant x (Extension)”2

Question 3

What is the equation for gravitational potential

Answer 3

Mass x Gravitational Field Strength

Question 4

Define Specific Heat Capacity

Answer 4

The amount of energy needed to raise
the temperature of 1 kilogram of a
substance by 1 degree Celsius

Question 5

State the units for Specific Heat

Capacity

Answer 5

Joules/Degree Celsius/Kilogram

Question 6

What is the definition of ‘Power’?

Answer 6

The rate at which energy is transferred

or rate at which work is done

Question 7

State two equations for power

Answer 7

power = energy transferred/time
power = work done/time

Question 8

What is the unit of power?

Answer 8

Watt (W)

Question 9

Describe the energy changes involved
when a ball is thrown upwards and then
returns to its starting position. Ignore air
resistance.

Answer 9

Upwards: KE is converted to GPE
● Peak: Maximum GPE, zero KE
● Downwards: GPE is converted to KE

Question 10

State 4 different stores of energy.

Answer 10

1. Kinetic Energy
2. Gravitational Potential Energy
3. Elastic Potential Energy
4. Chemical Energy

Question 11

Give examples of chemical energy

stores

Answer 11

● Food
● Fuel (eg. wood, coal, petrol)
● Batteries