WorksheetsAP Physics 1: Dynamics
Total questions: 15
Worksheet time: 8mins
Name
Class
Date
1.
A ball of mass m is suspended from two strings of unequal length as shown above. The magnitudes of the tensions T1 and T2 in the strings must satisfy which of the following relations?
a)
T1 = T2
b)
T1 > T2
c)
T1 < T2
d)
Tl + T2 = mg
2.
Which of the following correctly indicates the magnitudes of the forces acting up and down the incline?
a)
20 N down the plane, 16 N up the plane
b)
4 N down the plane, 4 N up the plane
c)
0 N down the plane, 4 N up the plane
d)
10 N down the plane, 6 N up the plane
3.
A horizontal, uniform board of weight 125 N and length 4 m is supported by vertical chains at each end. A person weighing 500 N is hanging from the board. The tension in the right chain is 250 N.
a)
125 N
b)
250 N
c)
375 N
d)
625 N
4.
Which of the following describes where the person is hanging?
a)
between the chains, but closer to the left-hand chain
b)
between the chains, but closer to the right-hand chain
c)
Right in the middle of the board
d)
directly below one of the chains
5.
A wooden box is first pulled across a horizontal steel plate as shown in the diagram A. The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B. How does the force required to overcome friction in the inclined case (B) compare to the horizontal case (A)?
a)
the frictional force is the same in both cases
b)
the inclined case has a greater frictional force
c)
the inclined case has less frictional force
d)
the frictional force increases with angle until the angle is 90º, then drops to zero
6.
When the frictionless system shown above is accelerated by an applied force of magnitude the tension in the string between the blocks is
a)
F
b)
2/3 F
c)
½ F
d)
1/3 F
7.
A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle of θ with the horizontal, as shown above. The normal force exerted on the block by the surface has magnitude
a)
greater than W
b)
greater than zero but less than W
c)
equal to W
d)
0
8.
Two massless springs, of spring constants k1 and k2, are hung from a horizontal support. A block of weight 12 N is suspended from the pair of springs, as shown above. When the block is in equilibrium, each spring is stretched an additional 24 cm. Thus, the equivalent spring constant of the two-spring system is 12 N / 24 cm = and k2?
a)
k1 = k2 = 0.25 N/cm
b)
1/k1 + 1/k2 = 1/(0.5 N/cm
c)
k1 – k2 = 0.5 N/cm
d)
k1 + k2 = 0.5 N/cm
9.
A student pulls a wooden box along a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following must be true?
a)
P > f and N < W.
b)
P > f and N = W.
c)
P = f and N > W.
d)
P = f and N = W.
10.
The 10.0 kg box shown in the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:
a)
acceleration to the left.
b)
acceleration to the right.
c)
constant speed and constant velocity
d)
constant speed but not constant velocity
11.
A 6.0 kg block initially at rest is pushed against a wall by a 100 N force as shown. The coefficient of kinetic friction is 0.30 while the coefficient of static friction is 0.50. What is true of the friction acting on the block after a time of 1 second?
a)
Static friction acts upward on the block
b)
Kinetic friction acts upward on the block
c)
Kinetic friction acts downward on the block.
d)
Static friction acts downward on the block.
12.
A crate of toys remains at rest on a sleigh as the sleigh is pulled up a hill with an increasing speed. The crate is not fastened down to the sleigh. What force is responsible for the crate’s increase in speed up the hill?
a)
the contact force (normal force) of the ground on the sleigh
b)
the force of static friction of the sleigh on the crate
c)
the gravitational force acting on the sleigh
d)
no force is needed
13.
A box slides to the right across a horizontal floor. A person called Ted exerts a force T to the right on the box. A person called Mario exerts a force M to the left, which is half as large as the force T. Given that there is friction f and the box accelerates to the right, rank the sizes of these three forces exerted on the box.
a)
f < M < T
b)
M < f < T
c)
M < T < f
d)
f = M < T
14.
When the speed of a rear-drive car is increasing on a horizontal road, what is the direction of the frictional force on the tires?
a)
backward on the front tires and forward on the rear tires
b)
forward on the front tires and backward on the rear tires
c)
forward on all tires
d)
backward on all tires
15.
A spaceman of mass 80 kg is sitting in a spacecraft near the surface of the Earth. The spacecraft is accelerating upward at five times the acceleration due to gravity. What is the force of the spaceman on the spacecraft?
a)
4800 N
b)
4000 N
c)
3200 N
d)
800 N
100 %
