Science Forces

Question 0

Forces are measured by a …….. in ………

Answer 0

Neuton meter

Neutrons

Question 1

Forces are either…..

Answer 1

A push
Or
A pull

Question 2

Name the different types of forces.

Answer 2

Electrical
Friction
Gravity
Magnetic

Question 3

What are the properties of vectors?

Answer 3

Vectors have direction and size.

Question 4

Complete:

For every action force….

Answer 4

There is an equal and opposite reaction force.

Question 5

What happens if an object has no resultant force acting on it?

Answer 5

If it is at rest it stays at rest.

If it is moving it keeps moving at a constant speed in a straight line.

Question 6

How can a force be shown (depicted)?

Answer 6

With a vector.

Question 7

What does a vector look like?

Answer 7

It is a dot with a line and an arrow.

Question 8

What does the dot in a vector show?

Answer 8

The dot shows where the force begins.

Question 9

What does the length of the line in a vector show?

Answer 9

The length of the line shows the amount of force.

Question 10

What does the arrow in a vector show?

Answer 10

The arrow shows the direction of the force.

Question 11

If a book is lying on a table how would you describe the forces?

Answer 11

The forces are balanced.

Question 12

If an object has a resultant force acting on it then…..

Answer 12

its speed or direction will change.

Question 13

What is the formula for weight on earth?

Answer 13

W = m x 10

Question 14

What is the formula for mass?

Answer 14

M = w/10

Question 15

What do you call the turning effect of a force?

Answer 15

A moment

Question 16

On what does the turning effect (moment) of a force depend?

Answer 16

It depends on its size and where it is applied.

Question 17

The further away the force, the …….. The moment.

Answer 17

Bigger

Question 18

The bigger the force the ……… the moment.

Answer 18

bigger

Question 19

What is the formula for the moment of a force?

Answer 19

Moment = F x d

force x distance

Question 20

Define ‘F’

Answer 20

F = force in newtons (N)

Question 21

Define ‘d’

Answer 21

d = distance in metres (m) in centimetres (cm)

Question 22

What is moment measured in?

Answer 22

Newton metres (Nm) or Newton centimetres (Ncm)

Question 23

In which direction do moments act?

Answer 23

Moments act in either a clockwise or an anti-clockwise direction.

Question 24

State the principle of moments.

Answer 24

If equilibrium (balanced), the total clockwise moment equals the total anti-clockwise moment. ( which is a fancy way of saying nothing moved!)

Question 25

In levers, what do you call the point about which it turns?

Answer 25

A pivot or fulcrum

Question 26

In levers, what do you call the part you are trying to move?

Answer 26

The load

Question 27

In levers, what do you call the force you are using to move it?

Answer 27

The effort (which is why they say ‘move it! Make more effort!)

Question 28

What is the formula for density?

Answer 28

density (Kgm3) = mass (kg)/volume (m3)

Question 29

How do you measure the density of regular solids?

Answer 29

1. Measure the mass using a top pan balance.
2. Measure the dimensions of the solid using a ruler and calculate the volume (l x b x h).
3. Apply the formula density = m/v.

Question 30

How do you measure the density of irregular solids?

Answer 30

Use the displacement method: (bath time!)

1. Find the mass of the object using the top pan balance.
2. The volume is found by measuring the increase in the level of water in a measuring cylinder.
3. Apply the formula density = m/v

Question 31

How do you measure the density of liquids?

Answer 31

1. Measure the mass of a dry empty cylinder.
2. Pour in a known volume of liquid.
3. Measure the mass of the cylinder + liquid.
   The difference between the reading at no 2 and the reading at no 3 is the mass of the liquid.
4. Apply the formula density = m/v