Energy Flashcards
What is work done?
The energy that is transferred by a force
How do you work out work done?
Work done = Force x distance moved in direction of force
What is power?
Rate at which energy is transferred
How do you calculate power?
Work done / time taken
What is power measured in?
Watts (W)
What is work done measured in?
Joules (J)
What are contact forces?
Forces acting on objects (when the objects are touching) e.g. friction
How do the moon and earth stay in orbit?
The two bodies are attracting each other
The moon is within the Earth’s gravitational field
The force from moon on earth is the same as the force from earth on the moon. However it is in opposite directions
What are two forces that affect different objects but aren’t in direct contact?
Magnetism
Static electricity
What is the field in magnets?
Attract objects and attract or repel other magnets
Space around a magnet is where it affects other materials = magnetic field
What is field is there in static electricity ?
Object charged with static electricity has an electric field / electrostatic field
What happens when objects with the same charge are close to each other?
They produce a pair of forces that are equal in size but acting in opposite directions
When is the resultant force zero ?
When forces are equal in size but in opposite directions
How do you draw a scale diagram (parallelogram)?
Draw arrows at correct angles to represent the forces acting on object.
The length of each arrow represents the size of the force.
Draw lines from the top of these force lines, to make a parallelogram.
A lime straight across the middle from the two middle points of the parallelogram is the resultant force.
How do you draw a scan diagram (square)?
Draw a five arrow sack at correct angle diagonally
Draw a rectangle
The x axis and y axis are your resolved forces
