 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? ___ Click to see answer. 200 divided by 3 = 66.666 rounded to the nearest tenth is 66.7 mph 2. A marble traveled 90 centimeters in 1.23 seconds. How fast was it going? ___ Click to see answer. 90 divided by 1.23 = 73.170731 rounded to the nearest tenth is 73.2 cm/sec 3. It took an eyeball 0.45 seconds to travel 60 centimeter. How fast was it going? Click to see answer. 60 divided by 0.45 = 133.33333 rounded to the nearest tenth is 133.3 cm/sec 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? ___ Click to see answer. 200 divided by 3 = 66.666 rounded to the nearest tenth is 66.7 mph NORTH 2. A marble traveled 90 centimeters South in 1.23 seconds. What was its velocity? ___ Click to see answer. 90 divided by 1.23 = 66.66666 rounded to the nearest tenth is 66.7 cm/sec SOUTH 3. It took an eyeball 0.45 seconds to travel 60 centimeters EAST. What was its velocity? Click to see answer. 60 divided by .45 = 133.3333 rounded to the nearest tenth is 133.3 cm/sec EAST 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? 