Physics - FORCES AND MOTIONS

Distance - Time Graphs

Velocity - Time Graphs

what is drag

= air resistance

the friction that slows things down

First Law of Motion

when an object is moving at a constant velocity, the forces on it are balanced

Second Law of Motion

if an object is accelerating or decelerating, the forces on it are unbalanced

Third Law of Motion

if object A exerts a force on object B, then object B will exert an opposite force on object A

give the definition of a vector quantity

the physical quantity that has both directions as well as magnitude

give the definition of a scalar quantity

the physical quantity that only has magnitude

what is Hooke’s law

if you apply a force to a spring, then the force stretches the spring

the amount of force you apply is proportional to the stretch (up to a certain point)

equation for stopping distances

stopping distance = thinking distance + braking distance

what is thinking distance affected by

• reaction time

• the speed at which you are going

• tiredness…

what is reaction distance affected by

• conditions (road, vehicle)

• speed at which you are going

• mass of the vehicle