GRADE 11 TERM 1
50 MARKS
1 HOUR
PHYSICAL SCIENCES TEST
MARCH 2023
Section A multiple choice
Question 1
1.1 Two objects of masses m and 2m are arranged as shown in the diagram
below:
Which ONE of the changes below will produce the GREATEST increase in
the gravitational force exerted by the one mass on the other.
A
halve the smaller mass.
B
double the larger mass.
C
halve the distance between the masses.
D
double the distance between the masses.
(2)
1.2 Which ONE of the following forces ALWAYS acts perpendicular to the surface
on which an object is placed?
A
normal force
B
tension force
C
frictional force
D
gravitational force (2)
1.3 Which ONE of the following statements regarding inertia of an object is
CORRECT?
The inertia of an object …
A
is greater if its mass is smaller.
B
increases as the applied force on the object increases.
C
is the resistance to any change in its state of motion.
D
increases as the frictional force on the object increases. (2)
1.4 Three force X,Y and Z act at point O and are in equilibrium.
GRADE 11 TERM 1
50 MARKS
1 HOUR
PHYSICAL SCIENCES TEST
MARCH 2023
Which of following statements is incorrect.
A.
B.
C.
D.
The vector sum of all forces is zero
X is equal to the resultant of Y and Z
Z is the equilibrant of X and Y
The resultant of X , Y and Z is zero (2)
[10]
Section B
QUESTION 2
An object of mass 44,65 kg is suspended vertically in the air by TWO forces Fl
and F2 as shown in the sketch below:
F2 makes an angle of 60 0 with the vertical as shown
2.1
Fl and F2 are classified as vectors. Define a vector.
(2)
2.2 The object can be suspended vertically by a SINGLE FORCE instead of F1 and
F2
2.2.1 Provide a suitable name for this single force that can replace F1 andF2 (1)
2.2.2 Calculate the magnitude of this single force.
(3)
2.3
The vertical component of Fl has a magnitude of 262, 54 N. Calculate the
magnitude of F2
(5)
[11]
QUESTION 3
GRADE 11 TERM 1
50 MARKS
1 HOUR
PHYSICAL SCIENCES TEST
MARCH 2023
3.1 A skier in the diagram below, initially at rest, has just begun descending a 30°
slope
Assuming that the coefficient of kinetic friction (µK) is 0,10.
3.1.1
3.1.2
3.1.3
Draw a free-body diagram of all the forces acting on the skier.
Calculate her acceleration down the slope
(5)
Calculate the magnitude of the velocity she will reach after 4,0 s.
(3)
(3)
3.2 A system of two objects, an elevator and a counterweight, suspended by a
pulley and light cable is shown in the diagram below
The mass of the elevator with four people inside is 1 150 kg and its mass is 850 kg
when empty. The mass of the counterweight is 1 000 kg.
Ignore the mass of the pulley and the mass of the cable.
3.2.1
3.2.2
3.2.3
3.2.4
Define Newton’s Second Law of motion in words.
(2)
Draw a force diagram for all the forces acting on the elevator. (2)
Calculate the acceleration of the elevator.
(6)
Calculate the tension in the cable.
(3)
[23]
QUESTION 4
GRADE 11 TERM 1
50 MARKS
1 HOUR
PHYSICAL SCIENCES TEST
MARCH 2023
4.1 State in words, Newton’s Law of Universal Gravitation.
(2)
4.2 Calculate the magnitude of the gravitational force that the Moon exerts on the
Earth if the distance between their centres is 3.86 x108 m.
(4)
The Moon has a mass of 7.34x10 22 kg.
[6]
TOTAL:50 MARKS