quiz 2

Question 1

What is the unit and unit symbol for energy?

Answer 1

joule,J

Question 2

What is the unit and unit symbol for power?

Answer 2

Watt,W

Question 3

State the law of conservation of energy.

Answer 3

Energy cant be created or destroyed

Question 4

What is the equation that relates power,energy and time(in symbols)

Answer 4

p x t = e

Question 5

How is energy transferred from hot to cold objects?

Answer 5

Heating

Question 6

How is energy transferred through wires?

Answer 6

Electrical working

Question 7

Name 4 energy transfers

Answer 7

Mechanical working, Waves, heating and electrical working

Question 8

What is 1 W equivalent to in to in terms of joules and seconds?

Answer 8

one joule is transferred every second

Question 9

What is the equation that links work done,power and time(in symbols)

Answer 9

p x t = w

Question 10

What is power?

Answer 10

Rate of energy transfer

Question 11

What is the equation that links work done,power and time(in words)

Answer 11

power x time= work done

Question 12

Name 2 types of wave energy transfer

Answer 12

Light and sound

Question 13

what is the equation that relates power, energy and time(in words)

Answer 13

power x time= energy

Question 14

Which energy store changes when stretched or compressed objects relax, and how does it change?

Answer 14

elastic potential store decreases

Question 15

How is energy transferred when people or machines push or pull objects?

Answer 15

Mechanical working