TRYING TO CRAM ENTIRE SYLLABUS

Question 1

Density formula

Answer 1

Density = Mass (Kg) / Volume (m^3)

Question 2

Symbol for density

Answer 2

Looks like a p (called “rho”)

Question 3

Force

Answer 3

A force is a push or a pull that acts on an object due to the interaction with another object

Question 4

Object will continue at uniform velocity if…

Answer 4

Net force = 0

Question 5

Force

Answer 5

A force is a push or pull upon an object resulting from its interaction with another object

Question 6

Resultant force

Answer 6

A single force that has the same effect as all of the
original forces acting together

Question 7

How to calculate resultant force in Vector Diagram

Answer 7

Draw using a scale (e.g. 1N = 1cm) the 2 forces using a ruler and the appropriate angle in between. Then finish the parallelogram.

Question 8

Moment

Answer 8

The turning effect of a force

Question 9

Moment formual

Answer 9

Force (N) x Perpendicular Distance (m)

Question 10

Moment Unit

Answer 10

Nm (Newton meter)

Question 11

Momentum formula

Answer 11

Mass x Velocity

Question 12

What is momentum and it’s unit

Answer 12

Force gained by motion or a series of events. It’s symbol looks like a p (“rho”) and its unit is kgm/s

Question 13

The conservation of momentum principle

Answer 13

In a closed system,

the total moment before an event is = to the total momentum after the event

Question 14

Impulse

Answer 14

A change in momentum

Question 15

Formula to calculate force required to accelerate an object to a certain velocity in a certain time

Answer 15

Change in momentum / Time

Question 16

Specific Heat Capacity

Answer 16

The amount of energy required to raise the temperature of 1kg of the substance by 1 degrees C

Question 17

Change in thermal energy formula

Answer 17

Change in thermal energy (J) = mass x specific heat capacity x temperature change

Question 18

Internal energy

Answer 18

Total energy stored inside a system by the particles

Question 19

What does it tell us when the line becomes flat in a heating and cooling graph?

Answer 19

The material is changing state because the energy being put in (heat) is being used to break the forces of attraction between the particles instead of continuing to go up in temperature.

Question 20

Change from Gas to Liquid is called….

Answer 20

Condensation

Question 21

Specific Latent Heat

Answer 21

The specific latent heat of a substance is the amount of energy required to change the state of one kg of the substance with no change in temperature. Or simply, how much energy is involved in the changing of state stage.

Question 22

Specific latent heat of fusion

Answer 22

The energy required to change 1kg of a substance from a solid to a liquid with no change in temperature

Question 23

Specific latent heat of vaporisation

Answer 23

The energy required to change 1kg of a substance from a liquid to a vapor with no change in temperature

Question 24

Formula for calculating the energy required for a change of state

Answer 24

Energy for a change of state = mass x specific latent heat

Question 25

If the input and output forces are on different sides of the pivot then

Answer 25

they will act in different directions

Question 26

Gears allows what

Answer 26

The turning effect to be transmitted (e.g. from Engine to wheels)