sience Flashcards
(33 cards)
when is work done
work is done when a force moves an object over a distance
what is force
force is an action that makes an object push pull twist turn move and change shape
what is force measured in
It is measured in newtons
what are force meters used for
They are used to measure the size of a force
What does friction do
It slows or stops movement
What is friction
Friction is a force that acts between two surfaces that are moving or trying to move over each other
How is friction produced
When a object rubs against each other friction is produced
What are the different types of friction
Sliding friction Rolling friction Fluid friction and Static friction
What does sandpaper do
It promotes friction
What happens when margarine is added to the surface
When it is added it reduces friction
Types of forces
Magnetism and Gravity
Types of magnets
Bar magnet and Horse shoe magnet
Facts about magnets
Usually metal,have north and south poles,like poles repel each other and unlike poles they attract each other
What is the pulling force towards the centre of the earth
It is called gravity
When will an object sink
The object will sink if the buoyany force is less than its weight
What is buoyany
Buoyany is a force acting on a object that causes it to rise or move higher
What is upthrust force
Upthrust force is a upward force that acts an objects in a liquid or gas
What does gravity depend on
The masses of the objects
What is the ability to do work
Energy is the ability to do work
What cannot be created or destroyed
Energy cannot created or destroyed
What do our bodies need
Our bodies need energy
What are the two main types of energy
Potential energy and Kinectic energy
What is potential energy
Potential energy is energy that is stored in an object or system
What is Kinectic energy
Kinectic energy is energy that is in motion
