# MC Test Review Kinematics

Μηχανική

14 Νοε 2013 (πριν από 4 χρόνια και 8 μήνες)

158 εμφανίσεις

Multiple Choice Review

Kinematics 1D and 2D

CEDCB CBCAA BEACB CDCAB CA

Directions: Choose the best answer. Use g = 10 m/s
2

to make calculations easier.

Questions 1
-
3 relate to a

ball thrown straight upward with a speed of +12 m/s.

1
. What is the
ball’s acceleration just after it is thrown?

(A)

Zero

(B) 10 m/s
2

upward

(C) 10 m/s
2

downward

(D) 12 m/s
2
upward

(E) 12 m/s
2

downward

2
. How much time does it take for the ball to rise to its maximum height?

(A)

24 s

(B) 12 s

(C) 10 s

(D) 2 s

(E) 1.2 s

3
.
What is the approximate maximum height the ball reaches?

(A)

24 m

(B) 17 m

(C) 12 m

(D) 7 m

(E) 5 m

4.
Which two of the following pairs of graphs are equivalent?

(A)

(B)

(C)

(D)

(E)

5.
W
hich of the following is NOT true of a projectile launched from the ground at an angle?

(A)

The horizontal velocity is constant

(B)

The vertical acceleration is upward during the first half of the flight,

and downward during the second half
of the flight.

(C)

The horizontal acceleration is zero.

(D)

The vertical acceleration is 10 m/s
2

down
.

(E)

The time of flight can be found by horizontal distance divided by horizontal velocity.

x

t

v

t

0

0

0

0

0

x

t

v

t

x

t

v

t

x

t

v

t

x

t

v

t

6.
A projectile is launched horizo
ntally from the edge of a cliff 20 m high with an initial speed of 10 m/s. What
is the horizontal distance the projectile travels before striking the level ground below the cliff?

(A)

5 m

(B)

10 m

(C)

20 m

(D)

40 m

(E)

60 m

7
. A projectile is launched from
the
level ground
with a velocity of 40 m/s at an angle of 30

from the ground.
What will be the
magnitude of
vertical component of the projectile’s velocity just before it strikes the ground?
(sin 30

= 0.5, cos 30 = 0.87)

(A)

10 m/s

(B)

20 m/s

(C)

30 m/s

(D)

35 m/s

(E)

40 m/s

8.
Consider a

ball thrown up from the surface of the earth into the air at an angle of 30
o

above the horizontal.
Air friction is negligible. Just after the ball is released, its acceleration is:

a. Upwards 9.8 m/s
2

b. Upwards at 4.9 m/s
2

c. Downwards at 9.8 m/s
2

d. 0
m/s
2

e. None of these

9.
A baseball is tossed straight up into the air in the +y direction. Which of the following statements is true at
the point where the baseball reaches its greatest height?

(a) The velocity of the ball is 0 and the acceleration of
the ball is negative

(b) The velocity of the ball is 0 and the acceleration is 0

(c) The velocity of the ball is positive and the acceleration of the ball is negative

(d) The velocity of the ball is positive and the acceleration of the ball is 0

(e) The ve
locity of the ball is negative and the acceleration of the ball is negative

10.
An object that’s moving with constant speed travels once around a circular path. Which of the following
is/are true concerning this motion?

I.

The displacement is zero

II.

The average speed is zero

III.

The acceleration is zero

(a) I only

(b) I and II only

(c) I and III only

(d) III only

(e) II and III only

11.
Which graph of position x versus time t best represents a moving object with positive velocity
and positive ac
celeration, both in the x direction?

Questions
1
2
-
1
4 relate to five particles that start at x=0 at t = 0 and move in one dimension in
dependently of
one another. Graphs of the velocity of each particle versus time are shown below.

1
2. Which particle is farthest from the origin at 2 seconds?

(a) A

(b) B

(c) C

(d) D

(e) E

1
3. Which particle moves with a constant nonzero acceleration?

(a) A

(b) B

(c) C

(d) D

(e) E

1
4. Which particle is in its initial position at t =2
seconds?

(a) A

(b) B

(c) C

(d) D

(e) E

15. A spring
-
loaded gun is aimed horizontally and is used to launch
identical balls with different initial speeds. The gun is at a fixed position
above the floor. The balls are fired one at a time. If the speed
of the
second projectile is twice the speed of the first projectile fired, how is the
horizontal range (denoted R in the figure) affected?

(a) The range for both projectiles will be the same

(b) The range of the second projectile will be twice as large as
that of the first projectile.

(c) The range of the second projectile is about 1.4 times larger than that of the first projectile.

(d) The range of the second projectile is about 1.4 times larger than that of the first projectile.

(e) The range of the secon
d projectile will be smaller than that of the first projectile by a factor of 1.4

16.

An object moving horizontally with speed V falls off the edge of a vertical cliff

and lands a distance 2D
from the base of the cliff
. If it instead lands a distance
D fr
om the base of the cliff, how fast was it moving?
Assume air resistance is negligible.

(a) V

(b)

2 V

(c)
½ V

(d) 4 V

(e) It cannot be determined unless the height of the cliff is
known.

17.

1
8
.
The gr
aph describes the
velocity of an object

What type of motion could be represented by the graph?

(a) An object pushed horizontally on the ground and comes to a stop.

(b) An object pulled horizontally on the ground and finally speeds up

(c) An object tossed vertically into th
e air and falls back to the ground

(d) An object dropped vertically into the air and reaches a point below

(e) An object dropped vertically into the air hits the ground and bounces back up

19
.
A spark timer produced the tape pictured below. The object, mo
ving to the right, was

(a) slowing down

(b) accelerating then moving with constant speed

(c) moving with uniform motion

(d) traveling with constant velocity

(e) speeding up

2
0
.

2
1
. A bullet is shot vertically upward from a pistol
while on the flatbed of a pickup truck that is moving in a
straight line on a level, horizontal roadway at a speed of 20 m/s. If air resistance is negligible, what is the
bullet’s landing point?

(a) It lands in front of the truck, ahead of where it was lau
nched.

(b) It lands behind the truck, behind where it was launched.

(c) It lands in the flatbed of the truck, close to the point from which it was launched

(d) Its landing point is dependent on the bullet’s mass

(e) Its landing point is dependent on the va
lue of g

2
2
. A stone is thrown horizontally with a speed v off
a hillside cliff. The stone follows the path MNO as
shown. Which vector best represents the direction of
the acceleration of the stone at point N?