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Forces and motion definitions

Terms in this set (25)

Contact Force
A force between two objects that are touching
Non-contact force
A force between two objects that are not touching
Balanced forces
Opposite forces that are of equal size
Unbalanced forces
Opposite forces of unequal size
Resultant/Net Force
The overall force acting on an object
Average speed
The rate of change of distance travelled in a certain amount of time ( ms-1 )
Acceleration
The rate of change of speed in a certain amount of time ( ms-2 )
Deceleration
A decrease in speed ( negative acceleration value )
Constant speed
Speed remains the same over a period of time
Stationary
The object is not moving
Displacement
The distance something moved relative to the starting point
Force
A force is a push or a pull
Weight force
Force acting on an object's mass due to gravity acting towards the center of the Earth
Support force
The force provided by a surface that acts against weight force to prevent objects falling through the surface
Air resistance
A force that opposes motion due to the surface of the moving object colliding with air particles
Friction
A force that opposes motion due to the surface of 2 objects moving in opposite directions. Heat and sound are products of friction.
Drag
A term for air resistance and friction
Thrust
A force that causes an object to move
Lift
An upwards force caused by the movement of air across wings
Tension
A force provided by a string/wire/rope on the object that is hanging from it
Buoyancy
The force provided by a liquid in the upwards direction so that the object floats
Electrostatic
A force between oppositely charged particles
Magnetic
The force that occurs between poles in a magnet
Terminal velocity
When the speed reaches a point where drag force = weight force and the object stops accelerating
Mass
The amount of matter that makes up an object ( kg )
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