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



DISTANCE changes relative to a

The actual path an object travels

The object may turn and curve.


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 changes relative to a

3 Meters

4 Meters


DISTANCE changes relative to a

DISPLACEMENT

DIRECTION

LENGTH OF

ACTUAL PATH

METERS

STAIGHT LINE


The changes relative to a speed of an object can be determined if we know


The changes relative to a distance an object travels


And the changes relative to a time it takes to go this distance.


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


3 m/s __________________ changes relative to a

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 changes relative to a

Distance (D) in meters

Time (T) in seconds


Velocity = changes relative to a Distance

Time

V = D

T


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

K1 1. Rewrite formula

K2 2. Put in knowns

Uk 3. Do math

Formula 4. Write answer


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 to first base in 1.7s.

(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.


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

K1 1.

K2 2.

UK 3.

Formula 4.


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

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.


Acceleration travels at a speed of


Acceleration refers to a change in one of two things… travels at a speed of

Speed, or how fast you are moving.


Direction travels at a speed of in which you are moving.

Centripetal acceleration

Occurs during circular motion.


Time (T) seconds, travels at a speed of 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 travels at a speed of delta(∆)to indicate the change in velocity of an the object.


If the change in velocity is travels at a speed of positive, we will say that the object is speeding up.


If the change in velocity is travels at a speed of negative, we will say that the object is slowing down.


We travels at a speed of find the change in velocity by subtracting the initial velocity from the final velocity.


∆ V = travels at a speed of Vf – Vi

CHANGE = FINAL – INITIAL

IN VELOCITY VELOCITY VELOCITY


The unit for acceleration is travels at a speed of

meter or m/s2

second2


Change in travels at a speed of

Acceleration = Velocity

time

A = Vf– Vi A = ∆V

t t


Change in Velocity travels at a speed of

(∆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


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