# MOTION - PowerPoint PPT Presentation

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MOTION. To say something is truly moving, you have to observe how it changes relative to a reference point. How far an object travels will be measured in meters. DISTANCE. The actual path an object travels. The object may turn and curve. DISPLACEMENT.

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MOTION

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#### Presentation Transcript

MOTION

To say something is truly moving, you have to observe how it changes relative to a reference point.

How far an object travels will be measured in meters.

DISTANCE

The actual path an object travels

The object may turn and curve.

• DISPLACEMENT

Straight line path from start to finish, shortest distance.

Tells how far and gives a direction.

Measures the change in an object’s position.

5 Meters

3 Meters

4 Meters

DISTANCE

DISPLACEMENT

DIRECTION

LENGTH OF

ACTUAL PATH

METERS

STAIGHT LINE

The speed of an object can be determined if we know

The distance an object travels

And the time it takes to go this distance.

If I identify the direction in which that object travels, I am now taking about its velocity.

3 m/s __________________

speed_

velocity

3 m/s due North __________________

speed

5.6 m/s __________________

velocity

5.6 m/s out the door______________

To calculate how fast an object is moving we need to measure

Distance (D) in meters

Time (T) in seconds

Velocity = Distance

Time

V = D

T

A wheelchair racer finishes a 132 m race in 18s. What is his speed?

K11. Rewrite formula

K22. Put in knowns

Uk3. Do math

Find the velocity of a swimmer who swims 110 m toward the shore in 72 seconds.

K11.

K22.

UK3.

Formula4.

Find the velocity of a baseball thrown 38 m from third base to first base in 1.7s.

K11.

K22.

UK3.

Formula4.

Distance

(D)

Velocity

(V)

Time

(T)

If a cheetah can run at a maximum velocity of 29m/s towards its prey for 28 seconds, how far does it run?

K11.

K22.

UK3.

Formula4.

If you can run at a rate of 12 m/s, how far would you go in 3 seconds?

K11.

K22.

UK3.

Formula4.

A crow covers a distance of 120 m in 8 seconds. How fast does it fly?

K11.

K22.

UK3.

Formula4.

How far can a matchbox car travel in 8 seconds, if it travels at a speed of

2 m/s?

K11.

K22.

UK3.

Formula4.

Acceleration

Acceleration refers to a change in one of two things…

Speed, or how fast you are moving.

Direction in which you are moving.

Centripetal acceleration

Occurs during circular motion.

Time (T) seconds, for which the object travels.

Initial Velocity (Vi), or starting velocity of an object

Final Velocity (Vf), or the ending velocity of the object.

We will use the symbol delta(∆)to indicate the change in velocity of an the object.

If the change in velocity is positive, we will say that the object is speeding up.

If the change in velocity is negative, we will say that the object is slowing down.

We find the change in velocity by subtracting the initial velocity from the final velocity.

∆ V = Vf – Vi

CHANGE = FINAL – INITIAL

IN VELOCITY VELOCITY VELOCITY

The unit for acceleration is

meter or m/s2

second2

Change in

Acceleration= Velocity

time

A = Vf– ViA = ∆V

tt

Change in Velocity

(∆V)

Acceleration

(A)

Time

(T)

What is the acceleration of a car that starts at rest and gets to a speed of 29.4 m/s in 45 seconds?

K11.

K22.

K33.

UK4.

Formula

What is the acceleration of a toy travelling at a rate of 6 m/s if it comes to a stop in 2 seconds?

K11.

K22.

K33.

UK4.

Formula

What is the acceleration of a bird who takes off from a nest and 7 seconds later is travelling at a rate of 9 m/s?

K11.

K22.

K33.

UK4.

Formula

How long will it take for a person on bike to accelerate from rest to 15 m/s if the rate of acceleration is 10 m/s2?

K11.

K22.

K33.

UK4.

Formula