Activator Define acceleration in your own words. Give an example of when you have experienced acceleration in your life.

a Acceleration vf - vi t The rate of change of velocity Change in velocity over a change in time Unit of distance / (unit of time)2 (m/s)/s = m/s2 vf - vi change in velocity vf - vi a acceleration = t time a t

Acceleration

Acceleration Acceleration is not only an increase, but also a decrease in velocity Three ways to accelerate Speed up – positive acceleration Slow down – negative acceleration Change direction – you can feel this acceleration as you turn a corner in a car – your body is being “pushed” toward the outside of the curve

Acceleration

Rearrange the equation Q: a F: I: vf vi Ra: t

Rearrange the Equation Q: t F: I: vf vi Ra: a

1. You are interested in a new sports car that can go from 0 m/s to 120 m/s in 12 s. What is the acceleration of the car? Q Ra I C F

2. What is the acceleration of a vehicle that changes its velocity from 100 m/s to a dead stop in 10s? Q Ra I C F

3. During a race, a sprinter increases from 5. 0 m/s to 7 3. During a race, a sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25s.  What is the sprinter’s average acceleration during this period? Q Ra I C F

4. A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration? Q Ra I C F

5. A car traveling at 7. 0 m/s accelerates 2 5. A car traveling at 7.0 m/s accelerates 2.5 m/s2 to reach a speed of 12.0 m/s. How long does it take for this acceleration to occur? Q Ra I C F

6. You are traveling in a car that is moving at a velocity of 20 m/s 6. You are traveling in a car that is moving at a velocity of 20 m/s. Suddenly, a car 10 meters in front of you slams on its brakes. At that moment, you also slam on your brakes and slow to 5 m/s. Calculate the acceleration if it took 2 seconds to slow your car down. Q Ra I C F

7. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds 7. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration? Q Ra I C F

8. A car starts from a stoplight and is traveling with a velocity of 10 m/s east in 20 s. What is the acceleration of the car? Q Ra I C F

9. A ball rolls down a ramp for 15 s 9. A ball rolls down a ramp for 15 s. If the initial velocity of the ball was 0.8 m/s and the final velocity was 7 m/s, what was the acceleration of the ball? Q Ra I C F

10. A meteoroid changed velocity from 1 km/s to 1. 8 km/s in 0. 03 s 10. A meteoroid changed velocity from 1 km/s to 1.8 km/s in 0.03 s. What is the acceleration of the meteoroid? Q Ra I C F

11. The space shuttle releases a space telescope into orbit around the Earth. The telescope goes from being stationary to traveling at a speed of 1700 m/s in 25 s. What is the acceleration of the telescope? Q Ra I C F

12. A ball is rolled at a velocity of 12 m/s 12. A ball is rolled at a velocity of 12 m/s. After 36 seconds, it comes to a stop. What is the acceleration of the ball? Q Ra I C F