Mrs. Deringer

Speed, Velocity, and Acceleration

The distance the object goes in a given period of time is its speed. If the speed of an object is in a specific direction, it is called velocity. The change in velocity over a period of time is the acceleration of the object.

Create your own line graph link.

Speed

The distance traveled divided by the time taken to travel the distance"

Speed = Distance divided by Time:

For example,

If a marble traveled 60 cm. in 0.85 seconds, you would divide 60cm. by 0.85 = 70.588. Then you can round to the nearest tenth

70.6 cm/sec.

Try these practice problems for calculating speed:

1. A car traveled 200 miles in 3 hours. How fast was it going?

2. A marble traveled 90 centimeters in 1.23 seconds.

How fast was it going?

3. It took an eyeball 0.45 seconds to travel 60 centimeter.

How fast was it going?

Click on the Screen to watch a movie on Speed.

VELOCITY

Speed + Direction

If a marble traveled 60 cm. NORTH in 0.85 seconds, you would divide 60cm by 0.85 seconds = 70.588 cm/sec. and finally add the direction (NORTH) and round to the nearest tenth. Your final answer for velocity would be .

70.6 cm/sec. North

1. A car traveled 200 miles North in 3 hours. What was its velocity?

2. A marble traveled 90 centimeters South in 1.23 seconds.

What was its velocity?

3. It took an eyeball 0.45 seconds to travel 60 centimeters EAST.

What was its velocity?

Click on Screens to Watch movies on Velocity.

Acceleration - In science, acceleration means to

speed up, ,

slow down or

change direction.

 

Are you scientifically accelerating if . .

1. you are spinning in a circle?

2. you are speeding up?

3. you are slowing down?

4. you are changing your direction?