8.4Forces Flashcards
(24 cards)
Permanent magnets
Magnets that retain magnetism even when magnets are removed from other magnets
Temporary magnets
Are magnets that loose there magnetism when removed from other magnets
Repulsion
An opposing force
Magnetic field
Region around a magnetic material or a moving electric charge
Atoms
A very small particle that makes up all things. Atoms have the same properties as the objects they make up
Negatively Charged
A charge negatively
Positively Charged
A charge positively
Protons
Tiny, but heavy, particle found in the nucleus of an atom. Protons have a positive electrical charge
Neutrons
Tiny, but heavy, particles found in the nucleus of an atom. Neutrons have no electrical charge
Electrons
Very light, negatively charged particles inside an atom. Electrons move around the central nucleus of an atom
Insulators
Materials that do not allow electric charge to flow through them
Conductors
Materials that allow electric charge to flow through them
Gravity
The force of attraction that exists between any two bodies in the universe that have mass. The gravity at the Earth’s surface is the pull on objects near its surface towards the centre of the Earth
Contact Force
A force that acts only between objects that are touching
Non-contact Force
A force that acts between objects even though the objects are not touching
Magnetic Forces
The force (a push or pull) that acts between magnets (including the Earth) and magnetic objects
Electrostatic Forces
A non-contact force of electric charges at rest. We experience electrostatic forces when we pull off a jumper and our hair stands on end
Force
A push, pull or twist. Forces are measured in newtons (N)
Mass
A measure of the amount of material in an object of substance
Weight
A measure of the size of the gravity force pulling an object towards the centre of a massive body, such as the Earth. The weight of an object depends on the object’s mass
Newton
The unit for measuring forces
Air resistance
The force of air pushing on an object as the object moves through the air
Buoyancy
A force which keeps objects floating
Surface Tension
The ‘firmness’ of the surface of a liquid created by the attraction between particles at the surface. The surface acts like an elastic skin
