2.1 Speed, velocity and acceleration

How do you calculate average speed?

• distance divided by time

• time divided by speed

• speed divided by time

• total distance divided by total time

Speed in a given direction

• acceleration

• speed

• velocity

• average speed

Change in speed or velocity over a specific amount of time

• acceleration

• velocity

• average speed

• speed

What are the units for acceleration?

• m/s²

• m

• sec

• s/m

A stopped car begins moving and reaches a speed of 25m/s in 5 seconds. What is its acceleration?

• +25m/s²

• -0m/s²

• +5m/s²

• 5m/s

George rides his scooter 32 m in 20 s. What is his speed?

• 2 m/s^2

• 1.6 m/s

• 3.2 m/s

• 52 m/s

A car traveling 36 m/s slows to a stop in 9 s. What is the car's acceleration?

• 3 m/s^2

• - 3 m/s^2

• 4 m/s^2

• - 4 m/s^2

A kid is sledding down a hill going 2 m/s. 5 s later he is going 12 m/s. What is his acceleration?

• 7 m/s^2

• 10 m/s^2

• 3 m/s^2

• 2 m/s^2

To calculate velocity you need to know:

• distance and time only

• distance, time and direction

• distance and direction only

• distance, time and temperature

A cyclist is riding on the Silver Comet Trail traveling at 5 m/s. She increases her speed to 14 m/s in 3 s. What is her rate of acceleration?

• 3 m/s^2

• - 3 m/s^2

• 9 m/s^2

• - 9 m/s^2