intro to force and motion

force

a push or a pull of an object

contact force

a push or a pull on one object by another that is touching it

non contact force

a force that one object can apply to another object without touching

gravity

is an attractive force that exists between all objects that has a mass.

mass

is the amount of matter in an object

weight

is the gravitational force exerted on an object

friction

is a force that resists the motion of the surfaces that are touching

rolling friction

occurs between 2 surfaces in motion and one is a wheel, ball, roller

sliding friction

when one slid surface slides over another ex:writing or skating

static friction

surfaces in contact are at rest ex:book on table

fluid/air friction

relates to objects moving in fluid or air ex:swimming

lubricants

used to reduce friction

-wax on bowling lane or greace on car parts.

arrows are used to represent force

strength and direction

formula

mass*Acceleration

mass

is not a force

force

a vector measurement, it has both strength and direction

net force

the combination of all the forces acting on an object

balanced force

forces acting on an object that combine and form a net force of 0

unbalanced force

forces acting on an object that combine and form a net force of 0

Newtons first law of motion

the net force on an object is zero, the motion of the object does not change.

Interia

the tendency of an object to resist a change in its motion