physical quantities are force , velocity , displacement , acceleration and momentum

contact force - friction , air resistance , tension in popes and normal contact force

non-contact force - magnetic force , gravitational force and electrostatic force

represented by an arrow - the length show magnitude and direction show the direction of the quantity

sun and erath are attracted to each other by a non-contact force . force felt by both the sun and the earth

a chair exacts force from the ground whilst the ground pushes back the chair with the same force , equal force so felt by both chair and ground

only noticed on something really big like the gravitational force attached to a plant

on the surface of the plant it make all thing more towards the ground

weight of an object depends on the gravitational field at the location - weight changes in different locations e.g. earth or moon

a force measured in newtons using spring balance so it act at the centre of mass

the force attaching on an object due to it gravity - course the gravitational field around the earth

the closer you are to the mas the stronger the gravitational filed strength

amount of stuff in an objects and has the same value anywhere

increasing the mass increase the weight of an object they are direct proportionality

size of the arrow show the relative magnitudes of the force and the direction show the direction the forces acting on the objects

describe the force acting on an object e.g. skydiver weight pull him down where as the drag act in the opposite direction

number of forces acting act a single point can be replaced with a single forces - called resultant force

foce acting upon the same line has an overall effect found by adding those going in the same direction and subtracting any going the operate way

in real situation there at least two forces acting on an object along any direction

to make something move force is applied which needs energy aka work done is the energy transferred they are he same thing

push something along a hard surface your doing work against friction also the kinetic energy store due to friction because overall temperature increases

when force move an object through a distance energy is transferred and work id done on an object