P1

Question 1

What is energy

Answer 1

The ability of object to do work

Question 2

Explain kinetic energy

Answer 2

Energy possessed by a moving object

Question 3

Explain chemical energy

Answer 3

Energy stored in the binds between atoms, eg: food, batteries , animal muscles

Question 4

Explain gravitational potential

Answer 4

The energy an object has due to its gravitational position

Question 5

Explain elastic potential

Answer 5

The energy an object gains when the shape is changed

Question 6

Name four other types of energy stores not name

Answer 6

Internal
Magnetic
Nuclear
Electrostatic

Question 7

When someone pushes a box, what energy store is transferred

Answer 7

Chemical energy(muscles) -> kinetic energy(movement of the box)

Question 8

What is a mégajoule in joules

Answer 8

1,000,000J

Question 9

What is the kinetic energy equation

Answer 9

1/2 x M x V^2
M= mass kg
V= velocity squared

Question 10

What is the gravitational potential energy equation

Answer 10

MGH
m= mass
G= gravitational field strength (9.8)
H= height

Question 11

Elsastic potential energy equation

Answer 11

1/2 x K x e^2
K= potential spring cinstant (n/m)
E=2,718 extension in meters

Question 12

What is specific heat capacity

Answer 12

The amount of energy it takes to increase the temperature of 1KG of that material by 1 degree Celsius

Question 13

Specific heat capacity of water

Answer 13

4200 J/KG

Question 14

Equation for specific heat capacity

Answer 14

MC🔺0️⃣

M= mass in KG
C= specific heat capacity

Question 15

Equation for power

Answer 15

P= E
—
T

E=2,718 energy transferred
T= time taken

Question 16

What is the principle of conservation of energy

Answer 16

Energy cannot be created or destroyed
Total amount of energy in a closed system is constant

Question 17

In system that isn’t closed what happens to energy when it transferred

Answer 17

Some of it dissipates and becomes wasted energy

Question 18

Give an example of energy dissipation

Answer 18

Friction between moving parts of a machine leads to dissipation of energy though heat loss.
The chemical energy is transferred to kinetic energy, but some of the energy is transferred to heat as the machine heats up

Question 19

Name three ways to reduce heat dissipation from houses

Answer 19

Cavity wall insulation
Double glazed windows
Loft insulation- felt/ fiberglass

Question 20

Equation for efficiency

Answer 20

Useful power output
——————————
Total power input

Question 22

What is non renewable energy

Answer 22

Energy that cannot be replaced or takes millions of years to be replaced

Question 23

Give three examples of non renewable energy sources

Answer 23

Coal, gas, nuclear

Question 24

Give three examples of renewable energy sources

Answer 24

Biomass, tidal and hydroelectric

Question 25

Biofuels are described as carbon neutral, what does that mean

Answer 25

They absorb carbon dioxide when alive but it is released when they are burnt or destroyed

Question 26

Positive and negatives of using nuclear power

Answer 26

They do not contribute to global warming . Release high amounts of energy with no carbon dioxide There ur a small risk of a meltdown happening, dangerous radioactive material is released Radioactive waster must be stored carefully

Question 27

Advantages and disadvantages of tidal power

Answer 27

Positive Endless energy source Long lifespan Predictable currents Negative Expensive to build Only works well in certain locations Can disrupt marine ecosystem