Forces Flashcards
What do forces change
The shape speed or motion direction of something
What is a force
A push pull twist or turn
What are forces measured using and what unit
Newtonmeter in newtons
What is mass
The amount of stuff (atoms, molecules) in a body
What is mass measured using and what unit
Kg or g using a digital balance
What is weight
The pull of gravity acting on a body
How do you calculate weight
Mass x gravitational pull (10)
What is friction
A force which opposes motion
When does friction act
When surfaces slide against each other
What force slows down aeroplanes
Air resistance
What shape reduces air resistance
Streamline
What does pressure tell us
How concentrated a force is
What does pressure depend on
Force and area
What kind of pressure is a big force pressing on a small area
High
What kind of pressure is a big weight spread out on a big area
Low
What is speed
How fast something moves
How do you calculate average speed
Distance divided by time.
What is energy measured in
Joules and kilojoules
What is gravitatinal potential energy
The energy an object gains when it is lifted higher
What is elastic potential energy
Energy stored in a wound up or stretched spring
What is kinetic energy
The energy an object has because it is moving
What is chemical energy
The energy stored in fuel, foods and batteries
What is electrical energy
Energy carried with electrical current
What is light energy
Energy that Allows us to see things around us
