acceleration

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes
• It doesn't
• It slows down
• Its speeds up  

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

• A car speeds up after a stoplight turns green.

• A car slows down as it approaches a red light

• A car with the cruise control set at 80 km/h going down a straight highway

• A car turning a curve at a constant speed

The SI unit for acceleration is

• mph

• ft/sec

• m/s²

• m/s

When are you undergoing an acceleration in a car? (Choose all that are correct)

• speed up

• slow down

• make turns

• constant speed

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

• 24 m/s²
• 18 m/s²
• 16 m/s²
• 16 m/s

A box sliding down an inclined plane attains a velocity of 27 m/s in 3 seconds from rest.  Find the acceleration.

• 30 m/s
• 24 m/s²
• 9 m/s²
• 81 km/hr

A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.

• 2.2m/s²
• 7.0m/s²
• 5.7m/s²
• 70m/s²

The picture of the position vs. time graph shows an object that is...

• accelerating/speeding up
• moving at a constant speed 
• not moving 
• accelerating/slowing down. 

Acceleration only takes place when things speed up. 

• True
• False

Which graph represents zero acceleration (constant velocity)?

• A
• B
• C
• D