Motion and Graphing Review

Motion

An object is in
MOTION if its
distance from a

REFERENCE point is

CHANGING

Un objeto está en MOVIMIENTO
si su distancia desde un punto de
REFERENCIA está CAMBIANDO

RELATIVE

This is why we say that motion is

relative. It depends on your

REFERENCE POINT
Your point of view

Your frame of reference

Por eso decimos que el movimiento es
relativo. Depende de tu PUNTO DE
REFERENCIA Tu punto de vista
Tu marco de referencia

Reference Points

What makes a good Reference Point?

1. Objects Fixed on Earth
2. Objects that are moving IF we are in them
3. We always assume the reference point is STATIONARY!

Siempre asumimos que el punto de
referencia está ESTACIONARIO, NO EN
MOVIMIENTO.

Multiple Choice

Greg is on a scooter and eating an ice-cream cone. (He is very talented.) The ice-cream is not moving in reference to the

• Scooter

• Earth

• Sun

• Trees

Multiple Choice

Greg is still holding his ice-cream as he is riding past Miranda at 4mph. Miranda sees the ice-cream and thinks that it looks yummy. BUT it is moving at 4 mph in reference to what?

• to her

• to Greg

• to the skateboard

Multiple Choice

A person on a plane would use what as a reference point?

• The plane

• The Sun

• The Earth

• The bus

Multiple Choice

A person standing at the airport and watching a plane fly would use what as a reference point?

• The plane

• The Sun

• The Earth

• The bus

Is it moving?

Is a girl riding 2 mph on a

skateboard moving in reference

to the trees around her?

YES!

in reference to the skateboard?

NO!

Speed

The distance an object moves

per unit of time.

Speed it a type of RATE.

A rate tells you a change that

occurs in time.

¡La distancia es importante para determinar si
algo está en movimiento! ¡Medimos la distancia
en metros, m! Unidad SI!

Finding Speed, Distance, and Time

Speed

A ball rolls 10 meters in 20 seconds.
What was its speed?

S = D / T
S = 10 m / 20 s
S = 0.5 m/s

Example
A ball is rolling at a speed of
10 m/s for 34 seconds. How

far does it travel.

What are you solving for?
Speed, Distance or Time?

Solve it!

Distance!

d = s x t
= 10 m/s x 34 s
= 340 m

Example
A ball is rolling at a speed of

2 m/s for 100m. How long

does it take?

What are you solving for?
Speed, Distance or Time?

Solve it!

Time!

t = d/s
= 100 m / 2 m/s
= 50 s

Multiple Choice

What is the speed of an object that travels 400 m in 50 seconds?

• 2000 m/s

• 450 m/s

• 350 m/s

• 8 m/s

The SLOPE of the graph

indicates the speed!

● The steeper the graph, the faster the

speed. Object A is STEEPER than the
rest of the lines (it would be more fun
to roll down!) so the object is going
FASTER!

● The flatter the graph, the slower the

speed. Object C has the FLATTEST
line so object is going the SLOWEST.

A

B

Distance(m)

C

Multiple Choice

A ball rolls 100 meters at a rate of 2 m/s. How long did this take?

• 200 seconds

• 50 seconds

• 20 seconds

• 50 meters

A STRAIGHT LINE means the

motion is CONSTANT and

UNCHANGING.

No speeding up or slowing

down.

NO ACCELERATION!

Speeding up

Slowing down

When you see a curve

on the graph it

indicates that the

object is either

SPEEDING up or

SLOWING down.

Velocity is different from speed. It

has TWO parts:

The first part is SPEED.

The second part is DIRECTION.

velocity is speed in a direction.
Graph B shows velocity moving constantly

AWAY from the reference point -

the POSITIVE direction.

Graph C shows velocity moving constantly

TOWARD the reference point -

the NEGATIVE direction.

Up
North
Toward
Forward

Down
South
Away
Backwards

Multiple Choice

Which graph shows constant motion?

Multiple Choice

Who has a faster speed?

• A

• B

• Same speed

• You cannot tell but B went further.

Multiple Choice

What matches this graph?

• Slowly away, fast back

• Quickly away, slowly back

• Quickly back, slowly away

• slowly back, quickly away

Multiple Choice

What matches this graph?

• Slowly away, fast back

• Quickly away, slowly back

• Quickly back, slowly away

• Slowly back, quickly

  away

Multiple Choice

What shows STOPPED motion?

Multiple Choice

What shows Slowing Down?

Multiple Choice

What shows Speeding up?