energy

Question 1

kinetic energy

Answer 1

the energy stored in moving objects

Question 2

stationary objects have…

Answer 2

no kinetic energy

Question 3

elastic potential energy

Answer 3

the energy stored in a spring when stretched

Question 4

what is the force applied to change the length of the string when stretched called?

Answer 4

applying this force is called doing “work”

Question 5

a spring with no stretch has…

Answer 5

no force meaning no extension

Question 6

a spring with stretch has…

Answer 6

a force meaning it will also have an extension

Question 7

extension is directly proportional to…

Answer 7

force applied

Question 8

gravitational potential energy

Answer 8

the energy stored in an object based on its position above the earth’s surface. this is due to the force of gravity acting on an object

Question 9

specific heat capacity

Answer 9

the amount of energy required to raise the temperature of 1kg of the substance by 1oC

Question 10

the law of conservation of energy

Answer 10

energy can be transferred,stored/dissipated but it cannot be created/destroyed

Question 11

system

Answer 11

an object/group of objects

Question 12

closed system

Answer 12

no energy can enter/leave

Question 13

friction

Answer 13

causes energy to be transferred to thermal energy

Question 14

to reduce unwanted energy transfers…

Answer 14

reduce friction

Question 15

friction can be reduced by…

Answer 15

removing the air particles from around the pendulum

Question 16

energy transfers: pendulum

Answer 16

• at the top the mass of the maximum store of Gravitational potential energy
• as the pendulum swings the GPE is transferred to kinetic energy
• at the bottom of the swing is the maximum mass of kinetic energy due to the bottom of swing being its max speed

Question 17

energy transfer: bungee jump

Answer 17

1. GPE is the only energy in the system
2. jumper falling = energy is transferred from GPE store to kinetic energy stored
3. bungee rope begins to tighten = kinetic energy store is at its maximum
4. bungee rope fully extended = kinetic energy is zero (the jumper is not moving)
   5.all energy has been transferred to elastic potential store
5. bungee rope then recoils and energy is transferred from elastic potential energy store to the kinetic energy store
6. KE begins to transfer to GPE
7. jumper never returns to the original position, because energy is dissipated as thermal energy due to friction.