Science Physics Flashcards
What is pressure?
Force per unit area
What are Pressure, Force and Area measured in?
- P Pressure - Pa Pascal
- F Force - N Newton
- A Area - m² Metres squared
How do you calculate density?
Density= Volume/Mass
What is the unit of density?
GPCC golf players cant count
grams per cubic centimeter (g/cm³).
What does density mean?
- How closely packed particles are in a solid, liquid and a gas.
What is velocity?
speed in a particular direction
Weight Formula
Think moon
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.
What is Pressure Formula
Stiletto
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
Why does weight change depending on where you are?
Moon
GRAVITY
The force of gravity is not the same everywhere – the force of gravity i
What is Mass?
MM
The amount of matter in an object.
Is Mass the same everywhere in the universe?
YES.
Mass is the same everywhere in the universe.
Can you change density of a gas?
Yes
This is because the particles can be different distances apart. This means you can change the volume without changing the mass.
Can you change the density of a solid or a liquid?
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.
What is Force?
P P - do to louis
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.
Explain why snow shoes work.
- Large surface area
- Spread the force over a larger area
- Reduce pressure on the snow
Stops people sinking into the snow.
Explain why tractor tyres work
Tractor tyres are wide - this reduces the pressure they exert and are less likely to sink in to wet ground
Define Pressure
Pressure is force per unit area.
Why is a sharp knife easier to cut with
When using a sharp knife, the small area of the blade creates a large pressure, making cutting easier.
What is friction
Friction is a force that always opposes motion.
It acts in the opposite direction to the one in which the box is moving.
What is an example of a non contact force
Non-contact forces are forces that act between two objects that are not physically touching each other.
Example: Magnetic force, gravity
What is a contact force?
Forces that act between two objects which are physically touching each other.
Example: friction
What happens with non balanced forces
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.
