G9 (Acceleration and Constant Acceleration)

Velocity has two components

(pick 2 below)

• direction

• change in speed

• speed up

• slow down

Acceleration is

• the rate at which velocity changes.

• the change in velocity

• the rate of change

• when you speed up only

In science, acceleration refers to

• increasing speed

• decreasing speed

• changing direction

• increasing speed only

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.

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 of the following is a unit for acceleration?

• km/s
• m/s²
• mi/hr
• ft

What is the final velocity of a rocket that travels for 4 seconds, has an initial velocity of 12 km/s and an acceleration of 2 km/s²?

• -4 km/s

• 10 km/s

• 20 km/s

• -10 km/s

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds
• 35 seconds
• 0.3 seconds
• 3.3 seconds

Which of the following is not accelerating?

• a ball being juggled

• a woman walking at 2.5 m/s along a

  straight road

• a satellite circling Earth

• a braking cyclist

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.