Energy Transfer

Question 1

What is the unit of mass?

Answer 1

Kilogram (kg)

Question 2

What is the unit of speed?

Answer 2

metres per second (m/s)

Question 3

What is the unit of energy?

Answer 3

Joule (J)

Question 4

What is the unit of power?

Answer 4

Watt (W)

Question 5

What is the unit of efficiency?

Answer 5

DOESN’T HAVE ONE, TRICK QUESTION, HAHAHAHA

Or percent, kinda, but its not a real unit

Question 6

What is power?

Answer 6

Energy transferred by a system per second

Question 7

What is efficiency?

Answer 7

The fraction of total energy converted into useful energy.

Question 8

What is the equation for GPE?

Answer 8

GPE = mgh

Question 9

What is the equation for KE?

Answer 9

KE = 1/2 m v^2 (half m v squared)

Question 10

What is the equation for efficiency, in terms of energy?

Answer 10

Efficiency = Useful Energy / Total Energy

Question 11

What is the equation for efficiency, in terms of power?

Answer 11

Efficiency = Useful Power / Total Power

Question 12

What is conduction?

Answer 12

Heat transfer due to collisions between particles.

Question 13

Give an example of conduction.

Answer 13

Heat transferring through a piece of metal, like a frying pan on a stove.

Question 14

What is convection?

Answer 14

Heat transfer due to the movement of fluids of differing densities.

Question 15

Give an example of convection.

Answer 15

The movement of air in a room due to a heater.

The movement of water around a cooking pot.

Question 16

Explain convection.

Answer 16

The fluid heats up.

The particles spread out.

The fluid becomes less dense.

The fluid rises due to buoyancy.

The fluid is replaced by colder fluid.

The process repeats.