Science 20F Cluster 3 In Motion

The tortoise moved slowly and steadily. The hare ran quickly, then fell asleep near the finish line. Identify the following quantities as scalar or vector, respectively: the average velocity of the tortoise during the entire race, the acceleration of the hare during the first 2 minutes of the race and the time it takes for the tortoise and the hare to finish the race.

• vector, vector, scalar
• scalar, scalar, vector
• vector, scalar, vector
• scalar, vector, scalar

If the acceleration of an object is in the opposite direction as the velocity, which of the following happens?

• the object speeds up
• the object slows down
• the object remains at rest
• nothing happens to the object

Suppose an object moving forward changes its velocity from 15 m/s to 6m/s. What is the change in velocity?

• -21m/s
• -9m/s
• 9 m/s
• 21 m/s

Acceleration is represented by the slope of a

• velocity-time graph
• position-time graph
• distance-time graph
• acceleration-time graph

A meteor goes from +1.0 km/s to 2.2. km/s in 0.04s. What is its acceleration?

• 0.03 km/s2
• 30 km/s2
• 55 km/s2
• 80 km/s2

Which of the following units is associated with?

• s
• m
• km
• m/s

Which of the following describes a scalar quantity?

• it has direction only
• it has magnitude only
• it is the size of a quantity
• it has both direction and magnitude

Use the following motion diagram representing a ball moving across a horizontal table to answer the question. Which of the following statements are descriptions of the motion of the ball? I - The ball is in uniform motion. II - The ball is moving from left to right. III - The displacement between t1 and t2 is the same as the displacement between t2 and t4.

• I and II only
• I and III only
• II and III only
• I, II, and III

The average velocity of a plane was 600 km/h [N]. How long did it take the plane to travel 120km?

• 0.2 min
• 5 min
• 12 min
• 5.0 h

A Canada goose flew 860km from Washington to British Columbia with an average velocity of 30.5 m/s [N]. Approximately how long did it take the goose to make its journey?

• 0.04 h
• 7.8 h
• 28.2 h
• 469.9 h