Physics - forces + work done (forces)

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