Forces

Subdecks (8)

what are vectors
direction
magnitude
examples of scalars
mass
temp
energy
what are scalars
only have magnitude
what are examples of vectors
velocity
displacement
acceleration
force
momentum
in a vector diagram the length of an arrow = magnitude and the direction of the arrow = direction of vector quantity
what is displacement
direction of distance
what is a force
push or pull which acts on an object due to its interaction with another object
what 3 things can forces do
change the shape
change the speed
change the direction
what is a contact force
one object touches another to exert a force
what are examples of a contact force
friction - acts between 2 sliding surfaces, can act to stop something from moving
air resistance - acts upon a moving object through the air
tension - force exerted on a rope when we pull something
normal contact force - supports an object which is resting on a surface, ie a table on the floor
what is a non contact force
act between two forces which are physically seperated
examples of non contact forces
gravity
electrostatic forces - act between charged objects
magnetic forces - can attract iron and steel objects
how many N = 1 MN
1,000,000 N = 1 MN
what is weight
force acting on an object due to gravity
dependant on the gravitational field strength of that object - ie earth is 9.8 N/KG
How to calculate weight
Weight (N) = mass (kg) x gravitational field strength (n/kg)
what is the centre of mass
the single point of an object at which weight acts on