CP7 Flashcards
Energy
Something that is needed to make things happen
Power
The amount of energy transferred per second. Measured in Watts
Watts
The unit for measuring power
Work done
A measure of the energy transferred where a force acts through a distance.
Action reaction forces
Pairs of forces on interacting objects. Action reaction forces are always the same size, in opposite directions and acting on different objects.
Contact forces
Forces where there needs to be contact between objects before the force can have an effect. (e.g friction/upthrust)
Electrostatic field
The space around an object with a charge of static electricity
Force field
The space around something where a non-contact force affects things. Examples include magnetic fields and gravitational fields.
Friction
A force between two surfaces that resists motion.
Gravitational field
The space around any object with mass where its gravity attracts other masses
Magnet
An object that has its own magnetic field around it.
Magnetic field
The area around a magnet where it can affect magnetic materials
Magnetic material
A material such as iron that is attracted to a magnet
Magnetism
The force caused by magnets of magnetic material
Magnitude
The size of something
Non-contact force
A force that can affect something from a distance (e.g gravity)
Normal contact force
A force that acts at right angles to a surface as a reaction to a force on that surface.
Static electricity
Electric charges on insulating material
Upthrust
A force that pushes things up in liquids and gases
Component (forces)
One or two forces at right angles to each other, resolved from a single force.
Free body force diagram
A diagram of an object showing all the forces acting on it, and the size and direction of those forces
Net force
Resultant force
Resolving forces
Representing a single force as two forces at right angles to each other
Scale diagram
A way of working out the resultant forces by drawing a diagram where the lengths of arrows represent the sizes of the forces
