7/27/2019 Physics Test 1 Form 4
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PHYSICS TEST 1 FORM 4 DATE:__________
NAME: ________________________ CLASS: __________
2.7 Safety Features In Vehicles: Diagram below shows a model of
a school bus.
Explain the modification to the bus to help to improve the
safety of the passengers and will be
more comfortable.
Emphasize your explanation in the following aspects:
(i) the shape of the bus body (ii) safety features of the
busSUGGESTED SOLUTIONS
1. Present the answers in table form.2. Each fact must be
followed by an explanation/reason.
3. Give short and accurate answer.
1 mark is given for one modification and 1 mark is given for
explanation. You can write more
than that. Marks are not deducted for incorrect answers. Make
sure that your answers are logic
and acceptable by common sense. The examiners will not judge
your grammar and linguistic
arts; they will judge the facts only.
1.A wooden dowel is fitted in a hole through a wooden block as
shown in figure. Explain whathappen when we
(a) strike the top of the dowel with a
hammer,____________________________________________________________________(2
marks)
(b)hit the end of the dowel on the
floor.____________________________________________________________________(2
marks)
MODIFICATIONS EXPLANATION
(1 mark) (1 mark)
(1 mark) (1 mark)
(1 mark) (1 mark)
(1 mark) (1 mark)
(1 mark) (1 mark)
7/27/2019 Physics Test 1 Form 4
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2. Car A of mass 100 kg traveling at 30 m s-1
collides with Car B of mass 90 kg traveling at 20 m s-
1in front of it. Car A is pulled by Car B after collision.
Determine the common velocity of Car A
and B after collision.
____________________________________________________________________(2
marks)
3. A trolley of mass 4 kg moves at 3 m s-1
and collide with a trolley of mass 2 kg which is movingin the
opposite direction at 1 m s
-1. After the collision, both trolleys move together with
the
same velocity. What is their common velocity?
____________________________________________________________________(2
marks)
4. A riffle of mass 5.0 kg fires a bullet of mass 50 g with a
velocity of 80 m s-1
.Calculate the recoil
velocity. Explain why the recoil velocity of a riffle is much
less than the velocity of the bullet.
____________________________________________________________________(2
marks)
5. Label the action force.
6. A trolley of mass 30 kg is pulled along the ground by
horizontal force of 50 N. The opposing
frictional force is 20 N. Calculate the acceleration of the
trolley.
___________________________________________________________________(2
marks)
7. A 1000 kg car is travelling at 72 km h-1
when the brakes are applied. It comes to a stop in a
distance of 40 m. What is the average braking force of the
car?
____________________________________________________________________(2
marks)
8. A force of 20 N is applied for 0.8 s when a football player
throws a ball from the sideline.
What is the impulse given to the ball?
____________________________________________________________________(2
marks)
9. A stuntman in a movie jumps from a tall building an falls
toward the ground. A large canvas
bag filled with air used to break his fall. How is the impulsive
force reduced?
____________________________________________________________________(2
marks)
10. What is meaning of
a.
inertia_____________________________________________________________(1
mark)
b. The principle of conservation of momentum
____________________________________________________________________(1
mark)
c.
Impulse______________________________________________________________(1
mark)
Stationary object
