11.3 Acceleration

1.What is acceleration?

• the rate at which speed increases

• the time an object’s velocity increases

• the rate at which displacement changes

• the rate at which velocity changes

A sports car can accelerate from 0 m/s to 28 m/s in four seconds. What is the acceleration of the car?

• 24 s

• 7 m/s²

• 27 m/s

• 27 m/s²

If you were to sketch a distance-time graph and a speed-time graph for an object experiencing constant acceleration, what would they look like?

• Both graphs would be linear (straight lines), with the distance-time graph being steeper.

• Both graphs would be linear (straight lines), with the speed-time graph being steeper.

• Both graphs would be nonlinear (curved).

• The speed-time graph would be linear (straight lines); the distance-time graph would be nonlinear (curved).

Which of the following is an example of negative acceleration?

• Mike starts riding his bike and uses the pedals to go from 0 km/h to 20 km/h.

• Mike pedals up a hill and gradually slows from 20 km/h to 5 km/h.

• Mike sits on his bike at the top of the hill and rests.

• Mike coasts downhill without pedaling, going from 0 km/h to 15 km/h.

The acceleration of an object at a specific point in time is the :

• instantaneous acceleration

• momentary acceleration

• positive acceleration

• numerical acceleration

TRUE or FALSE: If an object experiences a steady velocity change in a straight line, it is undergoing constant acceleration.

• TRUE

• FALSE

In terms of speed and directions, in what ways can an object accelerate?

• change in speed only

• change in direction only

• change in speed or direction

• constant speed and direction

What is the acceleration of an object in free fall due to Earth's gravity?

• 9.8 m/s²

• 9.8 m/s

• 39.2 m/s

• 19.6 m/s²

TRUE or FALSE: A horse on a carousel that is moving at a constant speed is accelerating.

• TRUE

• FALSE

How do you find the 'change in velocity' when calculating the acceleration of an object?

• Final velocity - Initial velocity

• Initial velocity - final velocity

• Final velocity - time

• Initial velocity - distance