Chapter 8: Forces In Action Flashcards
No cantact force
When with no contact a object may move
Contact force
When one object makes contact with another
Gravity
A pulling down force. This is a non contact force
Permanent magnets
These keep their magnetic forces when away from other magnets
Temporary magnets
These lose their magnetism when away from other magnets
Repulsion
A force in which objects move away from each other
Attraction
A force in which objects are pulled closer together
Force
A push or pull in a particullar direction. they occur around us all the time. Exzamples are pushing a door open, pushing a handle or pulling open your locker
Magnetic fields
They are Areas where the magnetic force acts
Domains
Domains are little magnets that determin if a item will be magnetic or not
Non magnetic domains
The domains inside a object are facing different dirrections so they cancel each other out
Magnetic domains
Domains that face the same dirrection making the object magnetic
Electro magnet
A magnet that when is touched with electricity from a battery has its domains lineup
Atoms
Very small objects that make up things and the atoms match that item by having the sam ppe property
Neucleus
The inside cell that acts as a control point
Electrons
very light, negatively charged particles inside an atom . Electrons move around the central nucleus of an atom
Negative electric charge
A atom that more electrons than protons
Protons
Heavy but tiny objects in a necleus that have a positive electrical charge
Positive electrical charge
A atom that has fewer electrons than protons
Neutrons
Tiny but heavy particals in a necleus that has no electrical charge
Neutral
A object with a even amount of protons and electrons
Static electricity
The build up of energy in one place
Insulators
Materials that wont allow electricity to go through them
Conducters
Materials that allow electricity to go through them
Lightning rod
A conductive metal rod attached to buildings so the lightning hits the rod and not the building
Mass
The measure of the amount in a object
Wieght
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 mas
Newton
The unit for measuring forces
Air resistance
The force of the air pushing at a object through the air
Terminal speed
The constant speed reached by a falling body. A body reaches terminal speed when the force of gravity pulling it down is balanced by the air resistance pushing against it
Boyance
The force which keeps and object 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
