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# MOTION - PowerPoint PPT Presentation

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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Presentation Transcript

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

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

K1 1. Rewrite formula

K2 2. Put in knowns

Uk 3. Do math

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

K1 1.

K2 2.

UK 3.

Formula 4.

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

K1 1.

K2 2.

UK 3.

Formula 4.

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?

K1 1.

K2 2.

UK 3.

Formula 4.

K1 1.

K2 2.

UK 3.

Formula 4.

K1 1.

K2 2.

UK 3.

Formula 4.

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

2 m/s?

K1 1.

K2 2.

UK 3.

Formula 4.

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.

∆ 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– Vi A = ∆V

t t

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?

K1 1.

K2 2.

K3 3.

UK 4.

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?

K1 1.

K2 2.

K3 3.

UK 4.

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?

K1 1.

K2 2.

K3 3.

UK 4.

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?

K1 1.

K2 2.

K3 3.

UK 4.

Formula