# Physical Science

1. A jogger jogs around a circular track with a diameter of 275 m in 15 minutes. What was the jogger’s average speed in m/s?

_________ m/s

2.   A group of college students eager to get to Florida on a spring break drove the 650-mi trip with only minimum stops. They computed their average speed for the trip to be 54.4 mi/h. How many hours did the trip take?

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__________ h

3.   An airplane flying directly eastward at a constant speed travels 289 km in 2.0 h.

(a) What is the average velocity of the plane?

_________ km/h

(b) What is its instantaneous velocity?

__________km/h

4. A ball is dropped from the top of a 87-m-high building. What speed does the ball have in falling 2.8 s?

__________ m/s

5. A race car goes around a level, circular track with a diameter of 1.00 km at a constant speed of 93 km/h. What is the car’s centripetal acceleration in m/s2?

________ m/s2

6. Which one of the following is always true about the magnitude of a displacement?

(a) It is less than or equal to the distance traveled

(b) It is equal to the distance traveled

(c)  It is greater than the distance traveled

(d) It is less than the distance traveled.

7. Distinguish between distance and displacement. How are these quantities associated with speed and velocity?

8. What changes when there is acceleration? Give an example.

9. A ball is dropped. Assuming free fall, what is its initial speed?
m/s_________

What is its initial acceleration?
m/s2________

What is the final acceleration?
m/s2________

10.  A motorboat starting from rest travels in a straight line on a lake.

(a) If the boat achieves a speed of 6.0 m/s in 14 s, what is the boat’s average acceleration?

magnitude_________  m/s2

direction (a) in the direction of a motion

(b) opposite to the direction of a motion

(b) Then, in 6.0 more seconds, the boat’s speed is 10 m/s. What is the boat’s average acceleration for the total time?

magnitude____________  m/s2

direction    (a) opposite to the direction of a motion

(b) in the direction of a motion

11. A gardener walks in a flower garden as illustrated in the figure below. What distance does the gardener travel?
m____________________

A coordinate plane has a horizontal axis labeled Distance (meters) and a vertical axis that is also labeled Distance (meters). A garden path is drawn on the coordinate system, and four arrows represent the path the gardener walks. The arrows are as follows:

• From (0,6) to (2,6),
• from (2,6) to (2,5),
• from (2,5) to (4,5),
• and from (4,5) to (4,3).

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