physics -energy stores cp8 p2

Question 1

kinetic energy is

Answer 1

any moving object

Question 2

thermal energy is

Answer 2

anything warm

Question 3

chemical energy is found in

Answer 3

food
fuels
batteries

Question 4

elastic potential energy is

Answer 4

Energy in stretched or squashed objects

Question 5

electrostatic energy is

Answer 5

: Energy in charged objects (+ve) or (-ve)

Question 6

magnetic energy is

Answer 6

When magnets attract or repel each other

Question 7

nuclear energy is

Answer 7

Energy stored in the nucleus of atoms

Question 8

gravitational potential energy

Answer 8

Object up in the air or up hill

Question 9

4 types of energy transfers

Answer 9

1. Mechanically: this must involve a force
2. Electrically: Energy flows in wires
3. Heating: heat moves from hot objects to cold ones
4. Radiation: by waves eg light and sound

Question 10

what is energy conservation

Answer 10

Energy cannot be created or destroyed, it can only be
transferred from one store into another

Question 11

wasted energy

Answer 11

Appliances often waste energy as HEAT and SOUND, this
energy spreads out into the atmosphere

Question 12

what is work done

Answer 12

-Work is done when a force makes an object move in the direction of the force.
-Work done is EQUAL to the energy transferred.
-Work is measure in Joules,

Question 13

what is power

Answer 13

• amount of work done in a
  time of 1 Second
  -energy transferred in 1
  second
  -Objects which do their
  work fast are powerful

Question 14

work done when climbing stairs
CORE PRACTICAL

Answer 14

1. Weigh yourself on scales in Newtons
2. Measure the vertical height of the stairs (m)
3. Walk up the stairs and time how long it takes (s)
4. Calculate work = Force x distance
5. Calculate Power = work done ÷ time

Question 15

work done and power when moving a box

Answer 15

1. Measure the force you use using a Newton meter (N)
2. Measure distance moved (m)
3. Use a stopwatch to record how long it took you (s)
4. Calculate work = force x distance moved
5. Calculate the power = work done ÷ time

Question 16

no work done is when

Answer 16

No work is done if you are not moving

Question 17

Lifting objects vertically

Answer 17

-The force moved vertically
is the objectsweight.
-WEIGHT is EQUAL to
FORCE
-The amount of work done
lifting an objects is
also EQUAL to the amount
of Gravitational Potential
Energy (J) the object gains by being lifted up