Forces Flashcards
acceleration
How quickly speed increases or decreases.
air resistance
The force on an object moving through the air that causes it to slow down (also known as drag).
average speed
The overall distance travelled divided by overall time for a journey.
balanced (forces)
Forces acting on an object that are the same size but act in opposite directions.
Contact force
Force that acts by direct contact, e.g., friction.
Distance- time graph
A graph that shows how far an object moves each second.
driving force
The force that is pushing or pulling something.
Equilibrium
State of an object when all forces are balanced.
Field
The region where other objects feel a gravitational force.
Friction
Force opposing motion which is caused by the interaction of surfaces moving over one another. It is called ‘drag’ if one is a fluid.
Gravitational field strength
The force from gravity on 1 kg (N/kg).
Gravity
A non-contact force that acts between two masses
Interaction pair
When two objects interact there is a force on each one that is the same size but in opposing directions.
Kilogram
A unit of mass, symbol kg.
Mass
The amount of stuff in an object (kg).
metres per second
A unit of speed.
Newton
Unit for measuring forces (N).
Newtonmeter
A piece of equipment used to measure weight in newtons.
Non- contact force
Force that acts without direct contact, e.g., magnetism
pull
A type of force.
push
A type of force.
relative motion
Different observers judge speeds differently if they are in motion too, so an object’s speed is relative to the observer’s speed.
resistive force
Any force that acts to slow down a moving object.
resultant force
Single force that can replace all the forces acting on an object and have the same effect. Calculated by taking the small force away from the bigger force acting in opposite directions.
