Magnetism Flashcards Preview

Science > Magnetism > Flashcards

Flashcards in Magnetism Deck (29)
Loading flashcards...
1
Q

What do like and unlike poles do?

A

Like poles repel, unlike poles attract.

2
Q

What is a compass?

A

A magnet that is free to rotate.

3
Q

What is a magnetic field?

A

The space around a magnet where a magnetic force can be seen.

4
Q

Ways to show magnetic fields?

A

Using iron fillings or plotting compasses.

5
Q

Where do magnetic field lines go?

A

From the North Pole to the South Pole of the magnet.

6
Q

Materials magnets can be made of?

A

Iron, steel, cobalt and nickel

These materials = attracted by magnets.

7
Q

Uses of magnets?

A

Compasses
Scrap yards
Fridge doors

8
Q

How would you plot the magnetic field around a bar magnet using plotting compasses?

A

Compasses placed around a bar magnet

Pointers point

9
Q

What is magnetism?

A

The force of attraction

10
Q

Why does a compass always turn North?

A

Its North Pole is attracted to the earths geographical South Pole

11
Q

Define a force

A

Something that causes an object to change speed or direction

12
Q

What are forces measured in?

A

Newtons (N)

13
Q

Name some examples of force

A

Push, pull, friction, magnetic, Gravity, weight.

14
Q

Name an instrument used to measure a force

A

Spring balance

15
Q

Define weight

A

The weight of an object on the earth is the force of attraction between the earth and the object

16
Q

What is weight measured in?

A

Newtons

17
Q

What is the force formula to find something’s weight?

A

Weight= mass (in kg) x acceleration due to gravity (10)

18
Q

Acceleration an object gets from the earth?

A

Is the same for all objects (10m/s²)

19
Q

Distinguish between mass and weight

A

Mass

- Measured in kg
- Fixed (never changes)
- Fixed feature of all things 

Weight

- newtons
- varies and depends on where you are
- is a force or pull on something
20
Q

State Hooke’s Law

A

The extension of a spring depends on the size of the weight attached to it

21
Q

What is a moment??

A

How much force can turn on a object

22
Q

Moment formula

A

Force x distance from the fulcrum

23
Q

Explain what a lever and fulcrum are.

A

A lever is a rigid body which is free to rotate about a fixed point called a fulcrum.

24
Q

What is an example of a fulcrum?

A

The middle of a seesaw

25
Q

What is an example of levers?

A

Door, door handle, scissors

26
Q

State the law of the lever

A

When a lever is balanced the sum of clockwise movements = the sum of anti clockwise movements

27
Q

What is the centre of gravity on an object

A

Centre where All the weight of the object appears to act.
i.e centre of weight

e.g you can balance a Pen on a finger if the finger is a the pen’s centre of gravity (if not the one will fall)

28
Q

What needs to happen for an object to be stable under gravity

A

Centre of gravity should be low as possible

Area of base should be large as possible

29
Q

What is equilibrium?

A

When an object is balanced it needs to

  • not topple easily when a small force is applied
  • it is unstable equilibrium if it will topple easily when small force is applied