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scalar
a quantity that has a magnitude only
vector
a quantity that has a magnitude and direction which is usually represented as an arrow
name 2 forces
push and pull
non contact forces
a force made when objects are physically separated
contact forces
a force made when objects are physically touching
what are forces measured in?
newtons (N)
equation for weight
mass (kg) x gravitational field strength (N/kg)
the weight and mass of an object are __________ proportional
directly
what is the difference between mass and weight?
mass → amount of matter in an object
weight → force of gravity acting on an object
equation for force
mass (kg) x acceleration (m/s²)
what happens to an object if forces are balanced?
the resultant force is zero
the object stays at rest or moves at constant speed
resultant force
overall force on an object
when a force causes an object to move through a distance, ______ is _______ on the object
work is done
1 newton meter =
1 joule
work done against friction
when an object is moved along a rough surface
what does work done against friction produce?
heat (thermal energy)
equation for work done
force applied (f) x distance (m)
mechanical work
a force which causes an object to move
transferring energy to the kinetic energy store of the object
gravitational work
a force which lifts up an object
transferring energy to the gravitational potential store of the object
