physics exam

1. READ THESE INSTRUCTIONS FIRST
Do not use staples, paper clips, highlighters, and glue or correction fluid.
Write your name and surname in the spaces provided.
There is a multiple choice section and a written section on this exam.
Answer all eight multiple choice questions.
For each question there are four possible answers A, B, C, and D.
Choose the one you consider correct and circle your choice in soft pencil.
Each correct answer is worth 5 marks. No marks will not be deducted for a wrong answer.
Answer the three written problems using an ink pen.
Each problem is worth 20 marks.
Bonus Warm-up question (5 marks)
Which object is faster than the other and why?

2. 2
Which apparatus must be used?
A a measuring cylinder containing water and a ruler only
B a measuring cylinder containing water only
C an empty measuring cylinder and a ruler only
D a ruler only
2 The graph shows how the speed of an object changes with time.
12
8
4
0
0 2 4 6 8 10
speed
m/s
time/s
How far does the object travel in 10 seconds?
A 8m B 10m C 40m D 80m
3 A car travels at an average speed of 60km/h for 15 minutes.
How far does the car travel in 15 minutes?
A 4.0km B 15km C 240km D 900km
4 Which quantity is a force due to a gravitational field?
A density
B mass
C weight
D volume
5 The density of air is 1.2kg/m3
.
A room has dimensions 5.0m � 4.0m � 3.0m.
What is the mass of the air in the room?
A 0.02kg B 0.10kg C 50kg D 72kg
(5 marks)
(5 marks)
(5 marks)
(5 marks)1 A student measures the volume of a small irregularly-shaped stone.
(5 marks)

3. 3
6 A student measures the length of a spring. She then attaches different weights to the spring. She
measures the length of the spring for each weight.
The table shows her results.
weight/N length/mm
0 520
1.0 524
2.0 528
3.0 533
4.0 537
5.0 540
What is the extension of the spring with a weight of 3.0N attached to it?
A 4mm B 5mm C 12mm D 13mm
7 Which statement gives a complete description of any object that is in equilibrium?
A There are no forces acting.
B There is no resultant force.
C There is no resultant force and no resultant turning effect.
D There is no resultant turning effect.
8 The diagram shows a lamp.
lampshade
pole
base
centre of mass
ground
Changing which feature increases the stability of the lamp?
A a larger lampshade
B a longer pole
C a heavier base
D a higher centre of mass
(5 marks)
(5 marks)
(5 marks)

4. 1 A train of mass 5.6 � 105
At time t = 0s, a resultant force acts on the train and it starts to accelerate forwards.
Fig. 1.1 is the distance-time graph for the train for the first 120s.
0
0
1000
2000
3000
4000
5000
20 40 60 80 100
time t /s
distance/m
120
Fig. 1.1
(a) (i) Use Fig. 1.1 to determine:
1. the average speed of the train during the 120s
average speed = ...........................................................
2. the speed of the train at time t = 100s.
speed = ...........................................................
4
kg is at rest in a station. [20 marks]

5. [Turn over
(ii) Describe how the acceleration of the train at time t = 100s differs from the acceleration
at time t = 20s.
.......................................................................................................................................
.......................................................................................................................................
.......................................................................................................................................
(b) (i) The initial acceleration of the train is 0.75m/s2.
Calculate the resultant force that acts on the train at this time.
resultant force = ...........................................................
(ii) At time t = 120s, the train begins to decelerate.
State what is meant by deceleration.
...........................................................................................................................................
.......................................................................................................................................
5

6. 2 Fig. 2.1 shows a uniform plank AB of length 2.0m suspended from two ropes X and Y.
0.5m
1.5m
rope X
A B
W = 210N
rope Y
P Q
Fig. 2.1
The weight W of the plank is 210N. The force in rope X is P. The force in rope Y is Q.
(a) State, in terms of P, the moment of force P about B.
...............................................................................................................................................
(b) Calculate:
(i) the moment of W about B
moment = ...........................................................
(ii) the force P
force P = ...........................................................
(iii) the force Q.
force Q = ...........................................................
6
[20 marks]

7. a) What is the acceleration?
i. between 0 and 2s
ii. between 2 and 4s
iii. between 4 and 5s
b) What is the distance traveled?
i. between 0 and 2s
ii. between 2 and 4s
iii. between 4 and 5s
7
3. Use the following graph of a moving toy car to solve the below questions. [20 marks]

8. Speed = distance / time (if the speed is constant)
Average speed = distance / time (if the acceleration is constant)
Acceleration = change in speed / time
_____________________________________________________________________
The equations of uniformly accelerated motion can be written in terms of s, u, v, a, t:
V = u + a.t
S = � (u + v).t
S = � a.t2
+ u.t
V2
= u2
+ 2.a.s
_____________________________________________________________________
Net force = mass x acceleration
Moment = force x perpendicular distance
Density = mass / volume
Pressure = force / area = fluid density x gravity x depth