Force, Momentum, Energy Test 2008
Name:
For the following questions, assume that the
gravitational field strength near the surface of the
Earth is 10 N kg-1.
Question 1
What is the magnitude of the net force that gives a
mass of 3.0 kg an acceleration of 5.0 ms-2?
A
0.6 N
B
1.7 N
C
5N
D
15 N
Question 2
Calculate the magnitude of the acceleration
produced when a net force of 100 N acts on a mass
of 5.0 kg.
A
100 ms-2
B
20 ms-2
C
5 ms-2
D
0.05 ms-2
Question 3
A single force of 25 N acts on a box and gives it an
acceleration of 4.0 m s–2. What is the mass of the
box? Ignore the effect of friction.
A
100 kg
B
25 kg
C
6.25 kg
D
1.6 kg
Question 6
What is the magnitude and direction of the thrust
provided by the rocket motor?
A
1.2 ×104 N
B
2 ×104 N
C
2.8 ×104 N
D
2 ×105 N
Questions 7 and 8 refer to the following
information.
Ella is pulling a 20 kg wagon along on level ground,
as shown in the following diagram.
The wagon moves with a constant velocity. The
rope makes an angle of 60 with the horizontal. Ella
applies a force of 120 N along the rope.
Question 7
What is the magnitude of the net force acting on the
wagon?
A
B
C
D
0N
60 N
104 N
120 N
Questions 4 to 6 refer to the following information.
A rocket has a mass of 800 kg. It is accelerating
upwards at 25 m s 2 near the surface of the Earth.
Question 8
Calculate the value of the horizontal resistance
forces acting on the wagon.
Question 4
What is the weight of the rocket?
A
2 ×104 N
B
8000 N
C
80 N
D
2 ×102 N
A
B
C
D
Question 5
What is the magnitude of the net force acting on the
rocket?
A
1.2 ×104 N
B
2 ×104 N
C
2.8 ×104 N
D
2 ×105 N
0N
60 N
104 N
120 N
Questions 9 to 11 refer to the following
information.
Evan has to push a van along a level road. The car
has a mass of 850 kg. Evan applies a horizontal
force of 120 N and resistance forces acting on the car
total 70 N. This situation is shown in the diagram
below.
Question 9
What is the magnitude of the net horizontal force
acting on the car?
A
50 N
B
70 N
C
120 N
D
190 N
Question 12
Determine the acceleration of the ship and the boat.
A
2.0 ms-2
B
1.6 ms-2
C
1.5 ms-2
D
1.1 ms-2
Question 13
Calculate the force that the ship applies to the boat.
A
300 N
B
550 N
C
800 N
D
1000 N
Questions 14 to 16 refer to the following
information.
The following graph shows how the magnitude of
the force of air resistance acting on an object as it
falls vertically through air varies with the distance
that it has fallen.
Question 10
Calculate the magnitude of the car’s acceleration.
A
0.06 ms-2
B
0.08 ms-2
C
0.14 ms-2
D
0.22 ms-2
Question 11
If the car starts from rest, calculate the speed of the
car if Evan pushes it with a constant force for a
distance of 20 m.
A
1.5 ms-1
B
1.8 ms-1
C
2.4 ms-1
D
3.0 ms-1
Questions 12 and 13 refer to the following
information.
A ship is towing a boat as shown in the following
diagram.
The ship has a mass of 2.0  103kg and the boat has
a mass of 500 kg. The thrust of 4.0  103 N is applied
on the ship by the water. Resistance forces of 1000
N act on the ship and 250 N act on the boat.
The object travels with a constant speed after falling
a distance of 80 m.
Question 14
What is the net force acting on the object after
falling a distance of 80 m?
A
0N
B
10 N
C
mg N
D
160 N
Question 15
What is the mass of the object?
A
0 kg
B
1kg
C
m kg
D
16kg
Question 16
What is the acceleration of the object after it has
fallen a distance of 30 m?
A
0 ms-2
B
5 ms-2
C
7.5 ms-2
D
10 ms-2
Questions 21 to 22 refer to the following
information.
A model car of mass 1.2 kg is initially at rest. It is
acted upon by a force that varies with time as
shown in this graph.
Questions 17 to 20 refer to the following
information.
A 0.50 kg ball travelling at 20 ms-1 east hits a wall
and bounces back at a velocity of 16 ms-1 west. The
ball is in contact with the wall for 2.5  10-2 s.
Question 17
What is the initial momentum of the ball?
A
2 Ns
B
8 Ns
C
10 Ns
D
18 Ns
Question 18
What is the change in momentum of the ball?
A
0 Ns
B
2 Ns
C
18 Ns
D
720 Ns
Question 19
What is the impulse on the ball?
A
0 Ns
B
2 Ns
C
18 Ns
D
720 Ns
Question 20
What is the magnitude of the force exerted on the
ball by the wall?
A
0N
B
18 N
C
80 N
D
720 N
Ignore resistance forces.
Question 21
What is the magnitude of the impulse acting on the
model car?
A
5.6 Ns
B
7.2 Ns
C
8 Ns
D
11.2 Ns
Question 22
What is the final speed of the model car?
A
6 ms-1
B
7.2 ms-1
C
8.24 ms-1
D
9.3 ms-1
Question 23
Calculate the kinetic energy of a car of mass 800 kg
travelling at 20 m s–1.
A
800 J
B
8000 J
C
16000 J
D
160000 J
Question 24
Calculate the gravitational potential energy of a 60
kg diver relative to the water at a height of 3.0 m
above the water.
A
20 J
B
60 J
C
600 J
D
2700 J
Questions 25 to 29 refer to the following
information.
A box of mass 2.0 kg is at rest on a horizontal
frictionless floor. A force of 10 N acts on the box for
a period of 2.0 s.
Question 25
Calculate the acceleration of the box.
A
1 ms-2
B
2 ms-2
C
2.5 ms-2
D
5 ms-2
Questions 30 to 32 refer to the following
information.
A roller coaster trolley of mass 200 kg rolls from rest
at the top of a section of track. This is shown in the
figure below.
The horizontal section of the track is 5.0 m below
the top of the track. The speed of the trolley on the
horizontal section was measured to be 8.0 m s–1.
Question 26
How far did the box travel while the force was
being applied?
A
2m
B
4m
C
10 m
D
20 m
Question 27
How much work was done on the box by the force?
A
2J
B
20 J
C
40 J
D
100 J
Question 28
What is the final kinetic energy of the box?
A
2J
B
20 J
C
40 J
D
100 J
Question 29
Calculate the final speed of the box.
A
1 ms-1
B
5 ms-1
C
10 ms-1
D
20 ms-1
Question 30
What is the gravitational potential energy of the
trolley at the top of the track relative to the
horizontal section?
A
1 × 103 J
B
2 × 103 J
C
1 × 104 J
D
2 × 104 J
Question 31
Calculate the kinetic energy of the trolley on the
horizontal section of the track.
A
2.5 × 103 J
B
6.4 × 103 J
C
2.5 × 104 J
D
6.4 × 104 J
Question 32
How much energy was lost to the environment as
the trolley moved down the track?
A
3.6 × 103 J
B
6.4 × 103 J
C
3.6 × 104 J
D
1.64 × 104 J