# Linear Motion (Grades 11-12)

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## Linear Motion

1.

Velocity is a quantity because it includes both and .

2.

Speed is an always-positive quantity represented by a scalar.

- True
- False

3.

What is the definition of acceleration?

- An object's resistance to motion
- How fast
- How much stuff (matter) is in an object
- The change in velocity over time

4.

A car drives 12km east, then turns and drives 2km west. What is its displacement?

- 14km, east
- 10km, east
- 14km, west
- 10km, west

5.

If a car travels 5 km in 2 minutes, what is its average speed?

- 30 km/hr
- 50 km/hr
- 100 km/hr
- 150 km/hr

6.

If a car travels at an average speed of 50kms/hr, how much time would it take to complete a trip of 75 kilometers?

- 30 mins
- 50 mins
- 60 mins
- 90 mins

7.

A body traveling at constant speed changes its direction without a change in its velocity.

- True
- False

8.

If a body goes from 10m/s to 50m/s in 8 seconds, what is its acceleration?

- [math]1.25m/s^2[/math]
- [math]5m/s^2[/math]
- [math]6.25m/s^2[/math]
- [math]40m/s^2[/math]

9.

An object's velocity is defined as its , which includes a direction and a magnitude.

- speed
- distance/time
- displacement/time
- acceleration/time

10.

If the acceleration of an object is negative, its velocity .

- will be increasing.
- will be decreasing.
- will be zero.
- will be constant.

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