Acceleration

Acceleration is

• the rate at which velocity changes.

• the change in velocity

• the rate of change

• when you speed up only

Velocity has two components

(pick 2 below)

• direction

• change in speed

• speed up

• slow down

What does it mean when a change in velocity is negative?

• The object is speeding up.

• The object is slowing down.

• The object is changing direction.

• The object is falling down.

A roller coasters accelerates from an initial speed of 6.0 m/s to a final speed of 70 m/s over 4 seconds. What's the acceleration?

• 24 m/s²

• 18 m/s²

• 16 m/s²

• 16 m/s

A car accelerates from a standstill to 70 m/s in 10 seconds.  What is the acceleration?

• 0.7m/s²
• 7m/s²
• 14m/s²
• none of the above

The SI unit for acceleration is

• mph
• ft/sec²
• m/s²

In each of the following cases, determine where the car has no acceleration ?

• A car shortly after a stoplight turns green.
• A car approaching a red light
• A car with the cruise control set at 80 km/h
• A car turning a curve at a constant speed

Which graph represents the greatest acceleration?

• A
• B
• C
• D

Which graph represents zero acceleration (constant velocity)?

• A
• B
• C
• D

A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?

• -7.5 m/s
• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi//hr