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 negative acceleration means that your object is _____. 

• not accelerating
• not moving
• speeding up 
• slowing down 

A positive acceleration means that your object is _____.

• not accelerating

• not moving

• speeding up

• slowing down

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 is defined as the CHANGE in 

• time it takes for one place to move to another place. 
• velocity of an object.
• distance divided by the time interval 
• velocity divided by the time interval 

Acceleration only takes place when things speed up. 

• True
• False

Which graph represents zero acceleration (constant velocity)?

• A
• B
• C
• D