Lesson 6: Doing work on gas

Question 1

What is work?

Answer 1

Work is the transfer of energy by force.

Question 2

Explain why exerting force on a container (ie making it smaller) increases temp of gas particles in container.

Answer 2

1.) Work is done on gas
2.) Particles gain kinetic energy from work done.
3.) This causes the temperature of gas to increase.

Question 3

Q.)

A bicycle pump is used to pump air into a bicycle tyre. Explain how this increases the internal energy of the air in the tyre?

Answer 3

1.) Work is done on air in tyre
2.) Particles gain kinetic energy
3.) This increases internal energy.

Question 4

Why does internal energy of gas increase when work is done on it?

Answer 4

1.) Work done on gas
2.) Particles gain KE from work
3.) This increases internal energy

Question 5

Why does pressure of gas increase when work is done on it?

Answer 5

1.) Work is done on gas
2.) Particles gain KE because of work
3.) More frequent collisions + more forceful collisions with wall of container.
4.) Increases pressure.

Question 6

Explain why the end nearest to the tire gets hot when using a bicycle pump.

Answer 6

1.) Work done on gas in tyre
2.) Gas particles gain KE because of work that has been done.
3.) This increases temp of gas
4.) Pump and tyre = connected so, nearest end would get hot too.