AP
Physics -
Multiple Choice - Identify the choice that best completes the statement or answers
the question.
1. If F = 4.0 N and m = 2.0 kg, what is the
magnitude a of the acceleration for the block
shown below? The surface is frictionless.
|
a. |
5.3 m/s2 |
|
b. |
4.4 m/s2 |
|
c. |
3.5 m/s2 |
|
d. |
6.2 m/s2 |
|
e. |
8.4 m/s2 |
2. The tension in a string from which a 4.0-kg object is suspended
in an elevator is equal to 44 N. What is the acceleration of the elevator?
|
a. |
11 m/s2 upward |
|
b. |
1.2 m/s2 upward |
|
c. |
1.2 m/s2 downward |
|
d. |
10 m/s2 upward |
|
e. |
2.4 m/s2 downward |
3. A 2.0-kg block slides on a frictionless 25° inclined
plane. A force of 4.6 N acting parallel to the incline and up the incline is
applied to the block. What is it’s acceleration?
|
a. |
1.8 m/s2 up the incline |
|
b. |
2.3 m/s2 up the incline |
|
c. |
6.6 m/s2 down the incline |
|
d. |
1.8 m/s2 down the incline |
|
e. |
2.3 m/s2 down the incline |
4. A 1.5-kg object has a velocity of 5j m/s at t =
0. It is accelerated at a constant rate for five seconds after which it has a
velocity of (6i + 12j) m/s. What is the magnitude
of the resultant force acting on
the object during this time interval?
|
a. |
3.8 N |
|
b. |
3.2 N |
|
c. |
2.8 N |
|
d. |
4.3 N |
|
e. |
4.6 N |
5. Only two forces act on a 3.0-kg mass. One of the forces is 9.0
N east, and the other is 8.0 N in the direction of 62° north of west.
What is the magnitude of the acceleration of the mass?
|
a. |
2.0 m/s2 |
|
b. |
2.4 m/s2 |
|
c. |
3.3 m/s2 |
|
d. |
2.9 m/s2 |
|
e. |
5.7 m/s2 |
6. The total force needed to drag a box at constant speed across a
surface with coefficient of kinetic friction mk is least when the force is applied at an angle q such that
|
a. |
sinq = mk. |
|
b. |
cosq = mk. |
|
c. |
tanq = mk. |
|
d. |
cotq = mk. |
|
e. |
secq = mk. |
7. A 5.0-kg mass sits on the floor of an elevator that has a
downward acceleration of 1.0 m/s2. On top of the 5.0-kg mass is an
object of unknown mass. The force of the elevator on the 5.0-kg mass is 80 N
up. Determine the unknown mass.
|
a. |
3.3 kg |
|
b. |
2.4 kg |
|
c. |
1.6 kg |
|
d. |
4.1 kg |
|
e. |
5.0 kg |
8. A block is pushed across a horizontal surface by the force
shown. If the coefficient of kinetic friction between the block and the surface
is 0.30, F = 20 N, q = 30°, and M = 3.0 kg, what is the
magnitude of the acceleration of the block?
|
a. |
2.8 m/s2 |
|
b. |
2.3 m/s2 |
|
c. |
1.8 m/s2 |
|
d. |
3.3 m/s2 |
|
e. |
5.4 m/s2 |
9. Two blocks in contact with each other are pushed to the right
across a rough horizontal surface by the two forces shown. If the coefficient
of kinetic friction between each of the blocks and the surface is 0.30,
determine the magnitude of the force exerted on the 2.0-kg block by the 3.0-kg
block.
|
a. |
15 N |
|
b. |
25 N |
|
c. |
11 N |
|
d. |
22 N |
|
e. |
33 N |
MULTIPLE CHOICE ANSWERS:
1. ANS: C
2. ANS: B
3. ANS: D
4. ANS: C
5. ANS: D
6. ANS: D
7. ANS: D
8. ANS: C
9. ANS: D