Science Physics

Question 1

What is pressure?

Answer 1

Force per unit area

Question 2

What are Pressure, Force and Area measured in?

Answer 2

• P Pressure - Pa Pascal
• F Force - N Newton
• A Area - m² Metres squared

Question 3

How do you calculate density?

Answer 3

Density= Volume/Mass
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Question 4

What is the unit of density?

GPCC golf players cant count

Answer 4

grams per cubic centimeter (g/cm³).

Question 5

What does density mean?

Answer 5

• How closely packed particles are in a solid, liquid and a gas.

Question 6

What is velocity?

Answer 6

speed in a particular direction

Question 7

Weight Formula

Think moon

Answer 7

Force = Mass x Gravity
Unit is N (newton)

The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity.

Question 8

What is Pressure Formula

Stiletto

Answer 8

Pressure = Force/Area
Unit is Pascal

In Physics, pressure is a measure of how much force is acting on a certain area.
Solids, liquids and gases can all exert pressure

Question 9

Why does weight change depending on where you are?

Moon

Answer 9

GRAVITY

The force of gravity is not the same everywhere – the force of gravity i

Question 10

What is Mass?

MM

Answer 10

The amount of matter in an object.

Question 11

Is Mass the same everywhere in the universe?

Answer 11

YES.
Mass is the same everywhere in the universe.

Question 12

Can you change density of a gas?

Answer 12

Yes
This is because the particles can be different distances apart. This means you can change the volume without changing the mass.

Question 13

Can you change the density of a solid or a liquid?

Answer 13

No
You cannot change the density of a liquid or solid.

This is because the mass and volume are linked: to increase the volume you have to increase the mass by the same amount.

Question 14

What is Force?

P P - do to louis

Answer 14

A force is a push or a pull.
Eg, when you push open a door you must apply a force to the door. You also must apply a force to pull open a drawer.

Question 15

Explain why snow shoes work.

Answer 15

• Large surface area
• Spread the force over a larger area
• Reduce pressure on the snow

Stops people sinking into the snow.

Question 16

Explain why tractor tyres work

Answer 16

Tractor tyres are wide - this reduces the pressure they exert and are less likely to sink in to wet ground

Question 17

Define Pressure

Answer 17

Pressure is force per unit area.

Question 18

Why is a sharp knife easier to cut with

Answer 18

When using a sharp knife, the small area of the blade creates a large pressure, making cutting easier.

Question 19

What is friction

Answer 19

Friction is a force that always opposes motion.
It acts in the opposite direction to the one in which the box is moving.

Question 20

What is an example of a non contact force

Answer 20

Non-contact forces are forces that act between two objects that are not physically touching each other.

Example: Magnetic force, gravity

Question 21

What is a contact force?

Answer 21

Forces that act between two objects which are physically touching each other.

Example: friction

Question 22

What happens with non balanced forces

Answer 22

When the forces acting on an object do not balance, the resultant force causes the object to accelerate in the direction of the resultant force.