Physics

Question 1

What is mass and what are its units?

Answer 1

Amount of matter and Kg

Question 2

What is weight and what are it’s units?

Answer 2

Effect of gravitational field on mass. Newtons

Question 3

What is the formula for working out weight?

Answer 3

W = mg (g=10 on earth)

Question 4

What is the formula for density?

Answer 4

Density = mass divided by volume

Question 5

How do work out volume?

Answer 5

Drop object in water and see how much level goes up by

Question 6

What is friction and what does it cause?

Answer 6

Force that opposes movement and it causes heat and wear and tear

Question 7

What is a force and what are they measure in?

Answer 7

Push or pull - Newtons

Question 8

What is air resistance?

Answer 8

Friction of the air when an object moves

Question 9

What is resultant force? What does it cause?

Answer 9

Overall force - acceleration of the object in that direction

Question 10

What is no resultant force called an what happens?

Answer 10

Balanced - object travels at a constant speed

Question 11

In Hook’s law a spring obeys F=kx What does F, k and x stand for?

Answer 11

F = force, k = spring constant, x = extension of the spring

Question 12

How do you calculate k in Hook’s law?

Answer 12

Gradient of the graph

Question 13

When does a spring reach its elastic limit on a graph?

Answer 13

No longer straight line

Question 14

Why does an elephant cause less pressure on the floor than a woman in high heels?

Answer 14

Even though it has more weight (force) it has much less area so has less force per area (P = F/A)

Question 15

Why do hot things expand?

Answer 15

Particles move faster and further away

Question 16

What does evaporation cause cooling?

Answer 16

More energetic particles escape at the surface of a liquid to become a gas. Ones left behind have less energy so cooler

Question 17

How can you speed up evaporation?

Answer 17

hotter, larger surface area, wind

Question 18

How is heat transferred in solids and how does it happen?

Answer 18

Conduction - hotter particles vibrate more and collide with ones next to them passing on energy

Question 19

How is heat transferred in liquids and gases and how does it happen?

Answer 19

Convection - hotter particles move faster and further apart so become less dense and rise

Question 20

Which is the only way heat can transfer in a vacuum?

Answer 20

Radiation in the form of waves

Question 21

What do like charges do?

Answer 21

Repel

Question 22

What do opposite charges do?

Answer 22

Attract

Question 23

How does something end up with a positive charge?

Answer 23

Loses electrons

Question 24

How does something end up with a negative charge?

Answer 24

Gains electrons

Question 25

What is static electricity caused by?

Answer 25

Friction

Question 26

What is something that does not allow electricity to flow through it called?

Answer 26

Insulators

Question 27

Dies static electricity occur in insulators or conductors?

Answer 27

Insulators

Question 28

What is a flow of charge called and what are its units?

Answer 28

Current (Amps)

Question 29

What is emf and potential difference (pd) also known as? What are the units?

Answer 29

Voltage (volts)

Question 30

How is an ammeter connected?

Answer 30

Series

Question 31

How is a voltmeter connected?

Answer 31

Parallel

Question 32

What equipment measure pd?

Answer 32

Voltmeter

Question 33

What equipment measures current?

Answer 33

Ammeter

Question 34

What letter represents current?

Answer 34

I

Question 35

What letter represents charge?

Answer 35

Q

Question 36

How is resistance calculated?

Answer 36

R=V/I

Question 37

If a wire has a longer length what happens to its resistance?

Answer 37

Goes up

Question 38

If a wire has a higher cross sectional area (thicker) what happens to its resistance?

Answer 38

Goes down

Question 39

If resistance goes up what happens to current?

Answer 39

Goes down

Question 40

In a series circuit what happens to current? What happens to pd (voltage)?

Answer 40

Current same everywhere, pd splits

Question 41

In a parallel circuit what happens to current? What happens to pd (voltage)?

Answer 41

Current splits between branches and pd is the same in every branch

Question 42

What is the total resistance of 2 resistors in series?

Answer 42

Add them together

Question 43

What is the total resistance of 2 resistors in parallel?

Answer 43

1/Rt = 1/R1 + 1/R2

Question 44

What is power measure in?

Answer 44

Watts

Question 45

What letter represents power in triangles?

Answer 45

P

Question 46

What letter represents energy?

Answer 46

E

Question 47

What are fuses used for?

Answer 47

Prevent overheating

Question 48

Why should electrical equipment be turned off during experiments?

Answer 48

Stop wires getting hot as this could affect resistance

Question 49

Which letter represents speed in triangles

Answer 49

V (velocity)

Question 50

On a distance time graph what does a diagonal straight line mean?

Answer 50

Constant speed

Question 51

On a speed time graph what does a diagonal straight line mean?

Answer 51

Acceleration or deceleration (sloping down)

Question 52

How do you calculate speed on a distance time graph?

Answer 52

Gradient

Question 53

How do you calculate acceleration on a speed time graph?

Answer 53

Gradient

Question 54

How do you calculate distance travelled on a speed time graph?

Answer 54

Area under the line (split into shapes)