PHYSICAL SCIENCES GRADE 11
NEWTON’S LAWS OF MOTION TEST 2
MARKS:40 TIME: 50 MINUTES
QUESTION 1: MUTIPLE CHOICE QUESTIONS
1.1 Which ONE of the following vector diagrams represents three forces acting on an object
simultaneously while the object moves at CONSTANT VELOCITY?
A. maintain its mass.
B. continue in a state of non-uniform motion.
C. remain at rest or in the state of uniform motion.
D. maintain its velocity when a non-zero net force is acting on it. (2)
1.2 The force diagram below shows the forces acting on a box.
N
W
Which ONE of the following equations for the magnitude of the normal force (N) is
CORRECT?
A. N = w + Fcosθ
B. N = w + Fsinθ
C. N = w − Fcosθ
D. N = w − Fsinθ (2)
1.3 The acceleration due to gravity on Earth is greater than that on the moon.
Which ONE of the following statements is correct?
A. The weight of the object on Earth is the same as that on the moon.
B. The mass of the object on Earth is the same as that on the moon.
C. The mass of the object on Earth is greater than that on the moon.
D. The weight of the object on Earth is less than that on the moon. (2)
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1.4 A learner pulls a block at a CONSTANT SPEED over a rough horizontal surface with a
force F. The force diagram below shows all the forces acting on the block.
X
F
Y
Z
Which ONE of the following relationships between the magnitudes of the F, X, Y and Z is
true?
A. F > Y and X = Z
B. F > Y and X < Z
C. F = Y and X = Z
D. F = Y and X < Z (2)
1.5. A person stands on a bathroom scale that is fixed to the floor of a lift, as shown in the
diagram below.
lift cable
lift
scale
The reading on the scale is largest when the lift moves …
A. upwards at a constant speed.
B. downwards at a constant speed.
C. upwards at an increasing speed.
D. downwards at an increasing speed. (2)
(10)
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QUESTION 2
2.1 State Newton’s second law of motion. (2)
2.2 A 6.4 N force pulls horizontally on a block of mass 1.5 kg. The block slides on a smooth
horizontal surface. The first block is connected by a horizontal string to a second block of
mass 0.93 kg on the same surface.
2.2.1Draw a free-body diagram for each block. (7)
2.2.2Determine the acceleration of the blocks. (7)
2.2.3Determine the tension in the string. (3)
2.2.4The mass of the first block is increased. State whether the tension in the string will
INCREASE, DECREASE OR STAY THE SAME. (1)
2.3 The metal head of a hammer is loose. To tighten it, you tap the hammer down onto the floor.
Should you tap the hammer WITH THE HANDLE END DOWN or WITH THE HEAD
END DOWN? Explain your answer. (4)
2.4 2.4.1 What do you understand by the term “apparent weight” of an object by referring to
motion in a lift. (2)
2.4.2 If you ride in an elevator moving upwards with a constant speed, is your apparent
weight the SAME AS, GREATER THAN OR LESS THAN your weight? Explain
the answer. (4)
(30)
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PHYSICAL SCIENCES GRADE 11
NEWTON’S LAWS OF MOTION TEST 1 MEMORANDUM
MARKS:39 TIME: 50 MINUTES
QUESTION 1
1.1 C/D ✓✓ (2)
1.2 D ✓✓ (2)
1.3 B ✓✓ (2)
1.4 C ✓✓ (2)
1.5 C ✓✓ (2)
QUESTION 2
2.1 The acceleration of an object is directly proportional to the net force acting on the object,
is in the direction of the net force, and is inversely proportional to the mass of the object.
(2)
2.2 2.2.1
(7)
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2.2.2
(7)
2.2.3 (3)
2.2.4 decrease (1)
2.3 Tap the hammer with the handle end down.✓The handle of the hammer comes to rest (4)
when it hits the floor,✓but the head continues to move downwards until a force acts on it
to bring it to rest. The force that acts on it is supplied by the handle, which results in the
head being wedged more tightly onto the handle.✓Since the metal head is heavy, the
wedging it onto the handle is big. ✓
2.4 2.4.1 The force exerted by the object on the floor of the liftwhen the lift is (2)
accelerating. ✓ ✓
2.4.2 Equal to your weight.✓If the elevator is moving in a straight line with a constant
speed, its acceleration is zero.✓Now, if the acceleration is zero, the net force must
also be zero.✓Hence, the upward force exerted by the floor of the elevator must be (4)
equal to the downward force of gravity on you.✓
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