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# Contact and non-contact forces

Differences between contact and non-contact forces
by

## Kayla Moore

on 4 October 2017

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#### Transcript of Contact and non-contact forces

Forces
Contact Forces
Non-contact Forces
A force that can cause or change motion of an object by touching it. Motors and gears operate through
contact forces
.

non-contact forces are exerted through a field of influence
Frictional forces
Air resistance
Buoyancy
Gravitational Forces
Magnetic
Forces
A push or a pull
in a particular direction
Forces may cause acceleration (speeding up, slowing down, or change the direction of motion)
cannot be seen but their effects are felt
Electrical
Force that results when the two objects are not in physical contact with each other, yet are able to exert a push or pull
Density
: a measure of mass per volume. The average density of an object equals its total mass divided by its total volume.
D = m/v
Unit of measurement = g/cm3
Air resistance is the
frictional force
air exerts against a moving object.
As an object moves, air resistance
slows it down
.
The faster the object's motion, the greater the air resistance exerted against it.
A kind of non contact force, materials such as iron, nickel, cobalt and other magnets just need to be near the magnet to be attracted or repelled
Non-contact force of electrical charges.
The force of attraction between any two objects in the universe.
All objects have gravitational force.
The
mass
of an object and its
distance
determines the strength of its gravitational force!
Full transcript