Forces Flashcards
Forces are a
push and pull motion
Force is measured in
Newtons
A scalar quantity is
one which only has a magnitude (size).
A vector quantity has
both magnitude and direction
examples of scalar quantities
distance, speed, mass, time, temperature
examples of vector quantities
displacement, velocity, acceleration, forces, momentum
Displacement
A single straight line from the start point to end point.
distance
the total path travelled by an object
Arrows can be used to represent vector quantities such as forces (vector diagrams):
Length of arrow corresponds to …
The direction of the arrow represents …
- the size of quantity.
- the direction at which the quantity is acting.
Contact forces
The force which is exerted between objects that are in physical contact with each other
Non-contact forces
The force exerted between two objects which are separated from each other
Examples of contact forces
friction, air resistance, normal forces, tension
examples of non-contact forces
Gravity, electrostatic, magnetism
Gravity is
the force of attraction between any 2 objects that have a mass
The higher the mass,
the stronger the force of gravity
Earth gravitational field strength
9.8N/kg
Moon gravitational field strength
1.6 N/kg
Why does the moon have a lower gravitational field strength than Earth?
It is 6 times lighter than the Earth.
Mass
The amount of matter an object has (kg).
Weight
The force exerted by an object (N).
Weight (N)=
mass (kg) x Gravity (N/kg)
Resultant force is
the overall force that acts on an object. An object can have multiple forces acting on it, but the resultant force is the single force after cancelling the forces.
forces acting in the same direction
adding forces together
forces acting in opposite directions
subtract the opposing forces