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Flashcards in Physics Deck (54)
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1

What is mass and what are its units?

Amount of matter and Kg

2

What is weight and what are it's units?

Effect of gravitational field on mass. Newtons

3

What is the formula for working out weight?

W = mg (g=10 on earth)

4

What is the formula for density?

Density = mass divided by volume

5

How do work out volume?

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

6

What is friction and what does it cause?

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

7

What is a force and what are they measure in?

Push or pull - Newtons

8

What is air resistance?

Friction of the air when an object moves

9

What is resultant force? What does it cause?

Overall force - acceleration of the object in that direction

10

What is no resultant force called an what happens?

Balanced - object travels at a constant speed

11

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

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

12

How do you calculate k in Hook's law?

Gradient of the graph

13

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

No longer straight line

14

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

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

15

Why do hot things expand?

Particles move faster and further away

16

What does evaporation cause cooling?

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

17

How can you speed up evaporation?

hotter, larger surface area, wind

18

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

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

19

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

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

20

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

Radiation in the form of waves

21

What do like charges do?

Repel

22

What do opposite charges do?

Attract

23

How does something end up with a positive charge?

Loses electrons

24

How does something end up with a negative charge?

Gains electrons

25

What is static electricity caused by?

Friction

26

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

Insulators

27

Dies static electricity occur in insulators or conductors?

Insulators

28

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

Current (Amps)

29

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

Voltage (volts)

30

How is an ammeter connected?

Series