Paper 1

Question 1

What is the principle of moments

Answer 1

For a body in equilibrium the sum of clockwise moments = sum of anti-clockwise moments

Question 2

What is archimedes principle

Answer 2

Upthrust exerted on a body is equal to the weight of displaced fluid

Question 3

What is elastic deformation

Answer 3

Will return to original shape when the load is removed

Question 4

What is the definition of a strong material

Answer 4

High UTS

Question 5

What is a ductile material

Answer 5

Easily draw into a wire

Question 6

What is a brittle material?

Answer 6

No plastic deformation

Question 7

What is the UTS?

Answer 7

Maximum breaking stress applied to a wire

Question 8

What is Newton’s first law

Answer 8

An object will remain at rest or constant velocity unless acted on by a resultant force

Question 9

What is Newton’s second law?

Answer 9

Force is equal to the rate of change in momentum

Question 10

What is Newton’s third law

Answer 10

Object A exerts an equal and opposite force on object B

Question 11

What is temperature in kelvin

Answer 11

Degrees + 273

Question 12

What is mass of a substance?

Answer 12

Molar mass x number of moles

Question 13

In pV= nRT what is n?

Answer 13

Number of moles

Question 14

In pV= NkT what is N?

Answer 14

Number of molecules

Question 15

What is isochronous oscillation?

Answer 15

Period is independent of amplitude

Question 16

What is damping?

Answer 16

Reduction in amplitude over time due to energy loss from resistive forces

Question 17

What is simple harmonic Motion?

Answer 17

Acceleration is directly proportional to displacement and in the opposite direction

Question 18

What is light damping?

Answer 18

Amplitude of oscillator gradually decreases but the period is almost unchanged

Question 19

What is very heavy damping?

Answer 19

No oscillatory motion return to equilibrium before a full oscialltion

Question 20

When does resonance occur?

Answer 20

When the driving frequency = natural frequency

Question 21

What effects does damping have on the SHM graph?

Answer 21

Reducing the maximum amplitude, reducing the frequency at which this maximum amplitude occurs

Question 22

What is keepers first law?

Answer 22

The orbit of a planet is an ellipse with the sun at one focus

Question 23

What is keplers eco d law?

Answer 23

a line segment joining a planet and the sun sweeps out equal areas in equal time intervals

Question 24

What is keplers third law?

Answer 24

The square of the orbital period is proportional to the cube of the average distance from the sun

Question 25

What is gravitational potential?

Answer 25

Work done per unit mass to move an object from infinity to that point in the field

Question 26

How do you find escape velocity?

Answer 26

Equate 1/2 mv squared with GMm / r

Question 27

What are stars modelled as?

Answer 27

Idealised black bodies

Question 28

What is an idealised black body?

Answer 28

A perfect absorber/ emitter of radiation

Question 29

What is isotropic?

Answer 29

The universe is the same in all directions

Question 30

What does homogenous mean?

Answer 30

Matter in the universe is uniformly distributed

Question 31

What are the assumptions of the ideal gases model?

Answer 31

large number of molecules in rapid motion, particles occupy negligible volume, all collisions are perfectly elastic ( time between collisions is negligible), negligible forces between particles (except during collisions)