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

Straight line path from start to finish, shortest distance.

Tells how far and gives a direction.

Measures the change in an object’s position.

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

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

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.

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.

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 refers to a change in one of two things…

Speed, or how fast you are moving.

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.

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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