Chapter 8: Forces Flashcards
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 Force
The force (a push or pull) that acts between magnets (including the Earth) and magnetic objects.
Electro Static Force
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
(noun) a push, pull or twist. Forces are measured in newtons (N). (verb) to push, pull or twist
Temporary Magnets
A magnet that stays magnetic only while it touches a permanent magnet, or one that is magnetic for a very short time
Permanent Magnets
A magnet that retains its magnetic effect for many years
Repulsion
An opposing force
Magnetic Force
The force (a push or pull) that acts between magnets (including the Earth) and magnetic objects
Atoms
A very small particle that makes up all things. Atoms have the same properties as the objects they make up
Negative Charged
The charge on an atom or object with more electrons than protons
Positively Charge
The charge on an atom or object with fewer electrons than protons
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
