Energy Stores

Question 1

What are the 8 energy stores you need to know?

Answer 1

• Kinetic
• Thermal
• Chemical
• Gravitation potential
• Elastic potential
• Electrostatic
• Magnetic
• Nuclear

Question 2

What would have energy in its kinetic energy store?

Answer 2

Anything moving has energy in its kinetic energy store.

Question 3

What would have energy in its thermal energy store?

Answer 3

Any object - the hotter it is, the more energy in this store.

Question 4

What would have energy in its chemical energy store?

Answer 4

Anything that can release energy by a chemical reaction, e.g. food, fuels.

Question 5

What would have energy in its gravitation potential energy store?

Answer 5

Anything in a gravitational field (anything that can fall).

Question 6

What would have energy in its elastic potential energy store?

Answer 6

Anything stretched, like springs, rubber bands, etc.

Question 7

What would have energy in its electrostatic energy store?

Answer 7

Two charges that attract or repel each other.

Question 8

What would have energy in its magnetic energy store?

Answer 8

Two magnets that attract or repel each other.

Question 9

What would have energy in its nuclear energy store?

Answer 9

Atomic nuclei release energy from this store in nuclear reactions.

Question 10

When is energy transferred TO its kinetic energy store?

Answer 10

If an object speeds up.

Question 11

When is energy transferred AWAY FROM its kinetic energy store?

Answer 11

If an object slows down.

Question 12

What does the amount of energy in the kinetic energy store depend on?

Answer 12

• The object’s mass.

- The object’s speed.

Question 13

What would increase the energy in an objects kinetic energy store?

Answer 13

• Greater mass

- Increased speed.

Question 14

What is the equation to find the energy in a kinetic energy store?

Answer 14

Kinetic energy = 0.5 x mass x (speed)2
KE = 0.5 x m x v2

KE = J

m = kg

v2 = m/s2

Question 15

What happens to the kinetic energy if you double the mass?

Answer 15

If you double the mass, the kinetic energy doubles.

Question 16

What happens to the kinetic energy if you double the speed?

Answer 16

If you double the speed, the kinetic energy quadruples (increased by a factor of 4).

Question 17

When will an object have energy in its gravitational potential energy store?

Answer 17

When an object is at any height above the Earth’s surface.

Question 18

What is the equation for change in gravitation potential energy?

Answer 18

ΔGPE = m x g x Δh

GPE = gravitational potential energy (J)
m = mass (kg)
g = gravitational field strength (N/kg)
h = vertical height (m)
Δ = change in