PHYSICS MIDTERMS

distance

length of a path an object takes to from A to B

displacement

shortest distance between x and x0

speed

how fast an object moves in unit time

velocity

the rate at which a body changes its poisiton

acceleration

change in velocity with respect to time

uniform motion

when a body covers equal distances in equal intervals of time without changing its direction

slope of d/t graph

speed

d/t graph (straight line)

object is at rest away from the body

d/t graph (oblique)

object is in uniform motion

d/t graph (decreasing oblique)

object is coming back to its original position, uniform motion

d/t graph (triangle)

object has travelled some distance and is coming back to its original position

v/t graph (line on x axis)

object is at rest

v/t graph (straight line parallel to x axis)

object is at uniform motion

v/t graph (oblique)

object is at uniform acceleration

v/t graph (exponential curve)

object is at increasing acceleration

v/t graph (decreasing exponential curve)

object is at decreasing acceleration

v/t graph: area below the graph

distance covered by the body

|v/t graph (line on x axis)

object is at rest

|v/t graph (lines parallel to x axis)

objects are at uniform velocity

|v/t graph (decreasing/increasing oblique)

objects are at uniform acceleration

|v/t graph (1st quadrant to 4th)

object decreased its velocity and changed its direction

|v/t graph: area below the graph

displacement

|v/t graph: slope

acceleration

1st equation of motion

v=u+at

2nd equation of motion

s = ut + ½ at² or s=ut+0.5at^2

3rd equation of motion

v^2=u^2+2as

force

interaction between matter

effects of force

change in position, shape/size, direction

1st law of motion

a body in rest will stay in rest and a body in motion will stay in motion unless an external, unbalanced, force acts upon it

Inertia

property of a body where in a body continues to remain in its own state/resist to change

mass and inertia

higher the mass, higher the inertia

2nd law of motion

The rate of change in momentum of a body is directly proportional to an external unbalanced force

momentum

p=m|v

3rd law of motion

any action has an equal and opposite reaction

sound

a form of energy which gives us the sensation of hearing