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Chapter 2 Review

Choose the best answer to each question and write the appropriate letter in the space provided.

1)  As an object falls freely in a vacuum, its __________.
A) acceleration increases.
B) velocity increases.
C) both A and B
D) none of the above

 Write True or False in the space provided.
2)  The SI unit of velocity is the meter.

3)  The rate at which velocity changes with time is called acceleration.

 On a separate sheet of paper, answer the following questions.

4)  Write a short paragraph explaining the difference between speed and velocity, and give examples of both.

 Choose the best answer to each question and write the appropriate letter in the space provided.

5)  One-half second after starting from rest, a freely falling object will have a speed of about __________.

A) 10 m/s.
B) 20 m/s.
C) 5 m/s.
D) 2.5 m/s.
E) none of the above

 6)  An object travels  8 meters in the first second of travel,  8 meters again during the second second of travel, and  8 meters again during the third second. Its acceleration is __________.

A) 32  m/s to power of (2).
B) 8  m/s to power of (2).
C) 0  m/s to power of (2).
D) 16  m/s to power of (2).
E) none of the above

 7)  A ball is thrown straight up. At the top of its path its instantaneous speed is __________.
A) 0 m/s.
B) about 10 m/s.
C) about 5 m/s.
D) about 50 m/s.
E) about 20 m/s.

 8)  The vertical height attained by a basketball player who achieves a hang time of a full  1 second is about __________.
A) 0.8 m.
B) 2.5 m.
C) 1 m.
D) more than 2.5 m.
E) 1.2 m.

 Write True or False in the space provided.
9)  When we discuss the motion of something, its motion is described relative to the motion of something else. ________

 Choose the best answer to each question and write the appropriate letter in the space provided.
10)  When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's acceleration __________.

A) is usually greater for taller players (but not always).
B) depends on launch speed.
C) varies with body orientation.
D) depends on all the above.
E) is g; no more, no less.

 11)  Suppose you are in a car that is going around a curve. The speedometer reads a constant  30 miles per hour. Which of the following is NOT true?

A) Your direction is constantly changing.
B) You and the car are accelerating.
C) Your velocity is constant.
D) Your acceleration is constant.
E) Your speed is constant.

 12)  One possible unit of speed is __________.
A) kilometers per hour.
B) miles per hour.
C) light years per century.
D) all of the above.
E) none of the above.

 Answer the following questions in the space provided. Show all work.
13)  If a projectile fired beneath the water, straight up, breaks through the surface at a speed of  16 m/s, to what height above the water will it ascend?

 Write True or False in the space provided.
14)  When a car rounds a corner at a constant speed, its acceleration is zero. _______

 Choose the best answer to each question and write the appropriate letter in the space provided.
15)  Acceleration is defined as the CHANGE in __________.

A) distance divided by the time interval.
B) velocity divided by the time interval.
C) time it takes to move from one place to another place.
D) velocity of an object.
E) time it takes to move from one speed to another speed.

 Answer the following questions in the space provided. Show all work.
16)  A skateboarder starting from rest accelerates down a ramp at  4.0 m/s to power of (2)for  4.0 s. What is the final speed of the skateboarder?

 Write True or False in the space provided.
17)  Average speed is defined as the time it takes for a trip divided by the distance. _______ 

Choose the best answer to each question and write the appropriate letter in the space provided.
18)  Suppose a car is moving in a straight line and steadily increases its speed. It moves from  35 km/h to  40 km/h the first second and from  40 km/h to  45 km/h the next second. What is the car's acceleration?
 A) 40 km/h\'97s
 B) 45 km/h\'97s
 C) 10 km/h\'97s
 D) 5 km/h\'97s
 E) 35 km/h\'97s

 19)  In the absence of air resistance, objects fall at constant __________.
 A) distances each successive second.
 B) velocity.
C) speed.
D) acceleration.
E) all of the above

 Answer the following questions in the space provided. Show all work.

20)  A stone is dropped from a cliff. After it has fallen  40 m, what is the stone's velocity? _____________

 21)  An apple falls from a tree and  0.5 second later hits the ground. How fast is the apple falling when it hits the ground? _____________

 Write True or False in the space provided.

22)  Even though a car is slowing down, it is still accelerating, in the most general definition of acceleration. _______

 23)  Velocity is different from speed in that velocity is speed in a given direction. _______

 Answer the following questions in the space provided. Show all work.

24)  You toss a ball at  30.0 m/s straight upward. How much time will the ball take to reach the top of its path? _____________

 25)  What vertical distance can a person with a  0.8-s hang time jump? _____________

 26)  A jet on an aircraft carrier can be launched from 0 to  50 m/s in  2.0 seconds. What is the acceleration of the jet? _____________

 Choose the best answer to each question and write the appropriate letter in the space provided.

27)  Suppose a jumper claims a hang time of  2 seconds. Then that jumper must be able to jump a vertical distance of __________.
 A) 2 m.
 B) 5 m.
 C) 4 m.
 D) 1 m.
 E) 3 m.

 Answer the following questions in the space provided. Show all work.

28)  What speed must you toss a ball straight up so that it takes  4.0 s to return to you?  _____________

 29)  Starting from rest, a car undergoes a constant acceleration of  6.0 m/s2. How far will the car travel in the first second?  _____________

 On a separate sheet of paper, answer the following questions.

30)  Write a short paragraph on how fast things fall on earth. Compare this to motion on the moon, where the acceleration due to gravity is about  1.6 m/s to power of (2).

 


If you have any questions, please email Ms. Cummings