What is the total
displacement of a student who walks 3 blocks east, 2 blocks north, 1 block west, and then 2 blocks south ? 0 2 blocks
east 2
blocks west 8
blocks 2.
A baseball pitcher throws a
fastball at 42 m/s. If the batter is 18 m from the pitcher, approximately how much time does
it take for the ball to reach the batter ? 1.9 s
2.3 s
0.86 s
0.43 s
3.
As a body falls near the surface of the Earth, its acceleration decreases increases remains the same
4.
A stone is dropped from a
bridge 45 meters above the surface of a river. Approximately how many seconds does the stone take
to reach the water's surface ? 1.0 s
10. s
3.0 s
22 s
5.
A 100 N force acts at a 30oangle to the horizontal. The magnitude of the vertical component of this force is
approximately 30. N
50. N
71 N
87 N
6.
What is the magnitude of the
net force acting on a 2000 kg car as it accelerates from rest to a speed of 15 m/s in 5.0 s ? 6000 N
20,000
N 30,000
N 60,000
N 7.
The magnitude of the
gravitational force of attraction between Earth and the Moon is approximately 2.1 x
1020 N 6.0 x
1024 N 6.7 x
10-11 N 7.8 x
1028 N 8.
How much work is done on a
downhill skier by an average braking force of 980 N to stop her in a distance of 10. meters ? 10. J
98 J
1000 J
9800 J
9.
A spring has a spring constant
of 120 N/m. How much potential energy is stored in the spring as it is stretched 0.20 meter ? 2.4 J
4.8 J
12 J
24 J
10.
A bicyclist accelerates from
rest to a speed of 5.0 m/s in 10. s. During the same 10. seconds, a car accelerates from a speed of
22 m/s to a speed of 27 m/s. Compared to the acceleration of the bicycle, the acceleration of
the car is less
greater
the same
11.
The work required to raise a
10. kg box from the surface of the earth to a height of 5.0 m is 50. J
100 J
200 J
490 J
12.
The work done in accelerating
an object along a frictionless horizontal surface is equal to the object's change in momentum
velocity
potential
energy kinetic
energy 13.
Which is a vector quantity ? power
weight
energy
mass
14.
As a baseball moves from a
distance of 3.0 m to a distance of 6.0 m above the earth's surface, the gravitational potential
energy of the ball-earth system decreases
increases
remains
the same 15.
If the distance between two
masses is tripled, the gravitational force between them becomes 1/9 as
great 1/3 as
great 3
times as great 9
times as great 16.
If an unbalanced force of 50.
N accelerates an object 20 m/s2, the mass of the object is 0.40
kg 2.5 kg
70. kg
1000
kg 17. A motor has an output of 1000 W. When the motor is working at full capacity, how much time will it require
to lift a 50 N weight 100 m ?5 s 10 s 50 s 100 s
18.
A basketball player who weighs 600 N jumps 0.5 m vertically off the floor. What is her kinetic energy just before hitting the floor ? 30 J
60 J
300 J
600 J 19.
Starting from rest, an object rolls freely down an incline that is 10 m long in 2 s. The acceleration of the object is approximately 0.5 m/s2
2 m/s2
5 m/s2
10 m/s2 20.
The work done on a 10.0 kg mass to give it a speed of 5.00 m/s is 50.0 J
2.00 J
125 J
250. J 21.
A net force of 12 N acting north on an object for 4.0 s will produce an impulse of 48 kg*m/s north
48 kg*m/s south
3.0 kg*m/s north
3.0 kg*m/s south 22.
A force of 3 N moves a 10 kg mass horizontally a distance of 3 m at constant velocity. The work done against friction is 6 J
9 J
3 J
30 J 23.
Two point masses that are equal are separated by a distance of 1 meter. If one mass is doubled, the gravitational force between the two masses would be 1/2 as great
2 times greater
1/4 as great
4 times greater 24.
Two horizontal forces act on a 1.0 kg wooden block as shown below.
If the block accelerates to the right at 2.0 m/s2, and F2 = 4.0 N, what is F1 ? -0.5 N
-1.0 N
-2.0 N
-4.0 N 25.
Two forces act concurrently on a point as shown below.
What is the magnitude of the resultant of these two forces ? 4.0 N
14 N
16 N
20. N 26.
The graph below shows the motion of an object traveling in a straight line.
What is the total distance traveled by the object ? 45 m
90. m
150 m
210 m 27.
As the angle between two concurrent forces of 5.0 N and 7.0 N increases from 0o to 180o, the magnitude of their resultant changes from 0 N to 35 N
2.0 N to 12 N
12 N to 2.0 N
12 N to 0 N
28.
A 20. kg mass moving at a speed of 3.0 m/s is stopped by a constant force of 15 N. How many seconds must the force act on the mass to stop it ? 0.20 s
1.3 s
5.0 s
4.0 s
29.
A crane raises a 200. N weight to a height of 50. m in 5.0 s. The crane does work at the rate of 8.0 x 10-1 W
2.0 x 101 W
2.0 x 103 W
5.0 x 104 W
30.
10 J of work are done in accelerating a 2.0 kg mass from rest across a horizontal frictionless table. The total kinetic energy gained by the mass is 3.2 J
5.0 J
10. J
20. J
