Laws And Equations

Question 1

Boyle’s law

Answer 1

Pressure x volume = constant (if temp remains constant)

P1 V1 = P2 V2

Question 2

Charles law

Answer 2

If pressure remains constant then volume is proportional to temp

V/T = constant

V1/T1 = V2/T2

Question 3

Combined gas law

Answer 3

P1V1/T1 = constant

Question 4

Mechanisms of heat transfer

Answer 4

Conduction - molecules collide, spread of heat from one place to another

Convection - spread of heat in a fluid, less dense = rises

Radiation - emission of electromagnetic waves

Question 5

Newton’s 2nd law

Answer 5

Rate of change of momentum of a body is proportional to the force applied

Question 6

Newton’s 1st law

Answer 6

A body will remain at rest/motion until an external force is applied

Question 7

Newtons 3rd law

Answer 7

For every action there is an equal and opposite reaction

Question 8

Momentum eq

Answer 8

Mass x velocity

Question 9

Thrust eq

Answer 9

Mass x acceleration n

Question 10

Work eq

Answer 10

Force x distance

Question 11

Power eq

Answer 11

Rate of doing work

Question 12

Torque eq and what it depends on

Answer 12

Twisting force/moment

Depends on

• force applied
• length of lever arm
• included angle

Question 13

Efficiency

Answer 13

The measure of output compared to input