U3 physics forces

Force

a push or pull, usually when it comes in contact with another object

Requirment for forces

one object exerts force onto another, exception is gravity

Non contact forces

• gravitational forces

• electromagnetic force

How to draw forces

depicted as arrows, no people, only box to show the object

force is vector or scalar

vector

two parts of a force

magntiude and length, how strong of a push or pull and length of the arrow is equal to the magnitude

Units

newtons (N) = force

if an object is not moving you show it by

having two arrows that are the same size

what force acts on an object

gravity is always acting and it’s straight down

what ever else is touching the object usually exerts a force on it

F_a = F_aap

applied force, exterted by another object or person

normal force

force exerted by surface on object

object is always perpendicular to the surface and outward

Free body diagram components

draw all the force vectors acting on an objetc

vector arrows are shown pointing away from the object