Energy

Question 1

What is the equation for work done

Answer 1

W(work) = F(force) x s(distance)

Question 2

What is the equation for weight

Answer 2

W(weight) = m(mass) x g(gravity 9.8)

Question 3

What is the equation for gravitational potential energy

Answer 3

Eg( gravitational potential energy) = m(mass) x g(gravitational field strength 9.8) x h(height)

Question 4

What is the formula for kinetic energy

Answer 4

Ek(kinetic energy) = 1/2m(mass) x v ²(velocity)

Question 5

What is the formula for elastic potential energy

Answer 5

Ee = 1/2k(spring constant n/m) x e ²(extension)

Question 6

What is the formula for efficiency

Answer 6

Efficiency = useful output/ Total input

Question 7

What is the formula for power

Answer 7

P(power watts) = E(joules) / t(time seconds)

Question 8

What are the 7 stores of energy

Answer 8

Kinetic, Thermal, Elastic potential, Gravitational potential, Chemical, Magnetic, Electrostatic

Question 9

What are the 4 types of energy transfer

Answer 9

Mechanical working (involves a force, surfaces being in contact) Electrical working (energy transferred via current) Heating by particles (only transfer of heat, heat moving from A to B, convection/ conduction) Heating by radiation (any electromagnetic wave)

Question 10

What is the conservation of energy

Answer 10

Energy cannot be created or destroyed

Question 11

What happens to wasted energy

Answer 11

It dissipates into the surroundings

Question 12

What happens when something moves through air particles

Answer 12

It causes friction and converts kinetic energy to thermal