1.       A person standing on a scale inside an elevator. Suddenly the elevator accelerates downwards. The person watching the reading of the scale will see

a)   The reading is the same as before.

b)   The reading is less than before.

c)   The reading is more than before.

d)   The reading is zero.

e)   The reading is decreasing at first then is increasing to the original number.

 

2.     A projectile is launched at an angle  to the horizontal with an initial velocity. In the absence of any air resistance, which of the following statements is correct?

a)   The horizontal velocity increases during the flight.

b)   The horizontal velocity remains constant during the flight.

c)   The horizontal velocity decreases during the flight.

d)   The vertical acceleration increases during the flight.

e)   The vertical acceleration decreases during the flight.

 

Questions 3—4 refer to the following graph below:

3.       The approximate acceleration between the time period 4−6 seconds is

a)      0 m/s2.

b)      2 m/s2.

c)       4 m/s2.

d)     6 m/s2.

e)      —6 m/s2.

 

 

Questions 3—4 refer to the following graph below:

4.       Which graph below best represents the displacement of the object in the time period 6 − 8 seconds?

a)       

b)      Text Box:

c)       Text Box:

d)     Text Box:

e)      Text Box:

Text Box:

 

5.       Ball A is projected horizontally at the same time as ball B is released and allowed to fall. If air resistance is negligible and both start from the same height, then

a)   A and B will reach the level ground at the same time.

b)   A will reach the level ground first.

c)   B will reach the ground first.

d)   we must know the mass of A and B to tell which will hit the ground first.

e)   we must know the density to tell which will hit the ground first.

 

 

6.       Which of the following is (are)   true of an object starting from rest and accelerating uniformly?

I.    Its kinetic energy is proportional to its displacement.

II.   Its speed is proportional to the square root of its displacement.

III. Its kinetic energy is proportional to the square of its speed.

IV. Its velocity is proportional to the square of the elapsed time.

a)   I, II, and III only

b)   I and II only

c)   II and IV only

d)   IV only

e)   I, II, III, and IV

 

7.       Ball A is projected vertically upward at the same time as ball B is projected horizontally. If air resistance is negligible and both start from the same height, then

a)   A and B will reach the level ground at the same time.

b)   A will reach the level ground first.

c)   B will reach the level ground first.

d)   we must know the mass of A and B to tell which will hit the ground first.

e)   we must know the density to tell which will hit the ground first.

 

8.       Ball A is dropped at the same time as object Y is projected vertically upward and object Z is projected horizontally. Air resistance is negligible. Which of the following is true?

a)   Ball A and B have the same downward acceleration, and it is greater than Z’s.

b)   Ball A and C have the same downward acceleration, and it is less than B’s.

c)   Ball B and C have the same downward acceleration, and it is greater than A’s.

d)   Ball C have the same downward acceleration, and it is less than A’s.

e)   Ball A, B, and C have the same downward acceleration.

 

 

 

 

 

Questions 9—10 refer to the following information:

The velocity of an object as it moves along a horizontal straight line is plotted against time as shown below.

9.       The distance traveled by the object during the first 2 seconds is

a)      2 m.

b)      4 m.

c)       8 m.

d)     16 m.

e)      24 m.

 

Questions 9—10 refer to the following information:

The velocity of an object as it moves along a horizontal straight line is plotted against time as shown below.

10.   Find the average speed of the object during the first 6 seconds, in meters per second.

a)      0

b)      1.33

c)       2.67

d)     3

e)      4

 

11.   A ball is projected vertically upward from the surface of Earth and reaches its maximum height in 4.0 seconds. Approximately what was the ball’s initial speed, in meters per second?

a)   0

b)   20

c)   40

d)   80

e)   100

 

12.   A ball is projected vertically upward from the surface of Earth and reaches its maximum height in 4.0 seconds. Approximately what is the maximum height, in meters, reached by the ball?

a)   0

b)   20

c)   40

d)   80

e)   100

 

Questions 13—14 refer to the following projectile motion:

A steel ball is projected horizontally from a certain height. It hits the ground in 10 seconds. Assume air resistance is negligible, and the initial speed of the object is 30 meters per second.

 

13.   Its acceleration during the third second is

a)      9.8 m/s2.

b)      3.2 m/s2.

c)       9.6 m/s2.

d)     32.7 m/s2.

e)      greater than that during the first second.

 

Questions 13—14 refer to the following projectile motion:

A steel ball is projected horizontally from a certain height. It hits the ground in 10 seconds. Assume air resistance is negligible, and the initial speed of the object is 30 meters per second.

 

14.   The horizontal distance traveled by the steel ball during the first 5 seconds is

a)      150 m.

b)      160 m.

c)       80 m.

d)     20.5 m.

e)      4.9 m.

15.   The graph above shows velocity y as a function of time r for a particle moving in a straight line. Graphs of displacement s versus time t that are consistent with the y vs. t graph above include which of the following?

I.II. III.

a)      I only

b)      III only

c)       I and II only

d)     II and III only

e)      I, II, and III

 

Questions 16-17 refer to the following information:

An object starts with a speed of 10 m/s and accelerates at −2 m/s2.

16.   How much time will pass until it comes to rest?

a)      2 s

b)      4 s

c)       5 s

d)     12 s

e)      20 s

 

Questions 16-17 refer to the following information:

An object starts with a speed of 10 m/s and accelerates at −2 m/s2.

17.   How far does the object travel before coming to rest?

a)      10 m

b)      25 m

c)       50 m

d)     75 m

e)      100 m

 

18.   An object starts from rest and accelerates at 3 m/s2. How far will it travel during the first 4 seconds?

a)   10 m

b)   12 m

c)   24 m

d)   36 m

e)   40 m

 

19.   A boy standing on a bridge throws a rock straight down and drops another rock to the river below. Neglecting air resistance, which statement best describes the situation just as the rocks reach the water?

a)   The acceleration of the thrown rock is greater.

b)   The acceleration of the dropped rock is greater.

c)   The acceleration of both rocks is the same.

d)   The average velocity of both rocks is the same.

e)   The final velocity of both rocks is the same.

 

20.   Water drips from a leaky ceiling fall at an interval of 0.4 seconds. As time passes, the distance between two consecutive drops of water

a)   decreases in a linear manner.

b)   increases in a linear manner.

c)   remains the same.

d)   decreases in a parabolic manner.

e)   increases in a parabolic manner.

 

21.   An object falls with constant acceleration near the Earth. Which statement best describes the velocity of the object?

a)   The velocity is constant.

b)   The velocity is decreasing.

c)   The velocity constantly changes in proportion to its weight.

d)   The velocity is not related to its acceleration.

e)   The velocity changes by the same amount each second.