In Motion

Displacement

100

An exact moment in time

Time Instant

200

Has both size and direction

Vector

300

Same speed all the time

Uniform Motion

400

t = tf - ti

tf = 15 s

ti = 10 s

5 s

500

V = d / t

d = -10 m

t = 2 s

-5 m/s

Acceleration

100

An object is speeding up towards the right

both signs are +

200

An object is speeding up to the left

both signs are negative

300

An object is slowing down to the right

signs are opposite

400

A = V / t

V = +70 m/s

t = 10 s

+7 m/s²

500

A = V / t

V = -200 m/s

t = 5 s

-40 m/s²

Force

100

Forces are unbalanced

the object moves

200

The Mass of an Object Decreases

Force decreases

300

The force increases

Acceleration increases

400

F = ma

m = 10 kg

a = +10 m/s²

+100 N

500

F = ma

m = 9 kg

a =-5 m/s²

-45 N

Momentum

100

Crumple Zones

Reduce Momentum

200

Roll Cages

Reduce Momentum

300

Objects in the car colliding after the first collision

Second Collision

400

p = m

m = 5 kg

v = +5 m/s

+25 kgm/s

500

p = mv

m = 10 kg

v = -90 m/s

-900 kgm/s

Impulse

100

Netting on an aircraft carrier

Impulse over longer time

200

Car crashes into brick wall

Impulse is large and quick

300

Impulse

Force to stop momentum

400

I = F / t

F = 10 N

t = 2 s

20 Ns

500

I = F / t

F = 3 N

t = 500 s

1500 Ns