P1-Energy Store and Transfers

Question 1

“Energy can be used up and created”(True or False)

Answer 1

False

Question 2

Name the 7 stores of energy.

Answer 2

Kinetic energy, thermal energy, chemical energy, elastic potential energy, gravitational potential, magnetic energy, electrostatic energy

Question 3

Name the 4 transfers of energy

Answer 3

Mechanical working, electrical working, heating by particles, heating by radiation

Question 4

What equation should you use to work out “work done”

Answer 4

Force x Distance = Work Done

Question 5

What units are used in this equation: force x distance = work done

Answer 5

(newtons) x (meters) = (Joules)

Question 6

What is the n/kg of earth’s gravity?

Answer 6

9.8

(g for great = 9.8)

Question 7

What equation do you use to work out the weight ?

Answer 7

Mass(kg) x gravity(N/kg) = Weight(n)

Question 8

What is the equation for gravitational potential energy?

Answer 8

Gravitational potential energy (joules) = mass(kg) x gravitational field strength (N/kg) x height(m)

Question 9

What is Gravitational potential energy (GPE)

Answer 9

It is the energy stored by an object by its position above the ground.

Question 10

What is the equation for kinetic energy?

Answer 10

Kinetic energy = 1/2 (0.5) x mass(kg) x velocity squared (m/s)

Question 11

how to find velocity?

Answer 11

distance(m)/time(s)

Question 12

What happens to wasted energy?

Answer 12

Dissipated

Question 13

What is the equation for efficiency?

Answer 13

Useful output/total output

Question 14

Name 2 types of energy given out by a hair dryer

Answer 14

Thermal and kinetic energy

Question 15

What is weight measured in

Answer 15

Neutons

Question 16

What is distance measured in

Answer 16

Meters

Question 17

What is work done measured in

Answer 17

Joules

Question 18

What is the spring constant measured in?

Answer 18

N/m (newtons per meter)

Question 19

What is extension measured in?

Answer 19

Meters

Question 20

What is elastic potential energy

Answer 20

Energy stored in a spring object when you pull or squash it.

Question 21

when is it mechanical working?

Answer 21

if it involves a force or surfaces being in contact (includes sound waves)

Question 22

when is it electrical working?

Answer 22

if it is via current or if wires are involved

Question 23

when is it heating by particles?

Answer 23

if it is heat moving from one place to another via conduction or convection

Question 24

when is it heating by radiation?

Answer 24

if it is heat radiation or electromagnetic waves(light)

Question 25

which energy transfers are being used:

1) rubbing hands together

2) burn fuel

Answer 25

1) kinetic——mechanical working—–> thermal

2) chemical—-heating by particles——>thermal

Question 26

how might someone reduce unwanted energy transfers in a gearbox for a wind turbine?

Answer 26

you could add some oil to reduce friction between parts, as that could waste energy in the form of thermal energy.

Question 27

what is the unit for gravity?

Answer 27

N/Kg