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A student is comparing the properties of mass and weight. Which statement correctly
distinguishes between these two quantities?
a. Mass is a vector quantity; weight is a scalar quantity
b. Mass is the amount of matter in an object; weight is the force due to gravity acting on
an object
c. Mass changes with location; weight remains constant
d. Mass is measured in newtons; weight is measured in kilograms
✔️ Correct Answer: B
Rationale:
Mass is the amount of matter in an object and is a scalar quantity measured in kilograms.
Weight is the force due to gravity acting on an object and is a vector quantity measured
in newtons. Option A is incorrect because mass is scalar and weight is vector. Option C is
incorrect because mass remains constant while weight changes with location. Option D is
incorrect because mass is measured in kilograms and weight in newtons.
What is the approximate value of gravitational field strength on Earth?
,a. 9.81 m/s²
b. 9.81 N/kg
c. Both a and b
d. Neither a nor b
✔️ Correct Answer: C
Rationale:
The gravitational field strength on Earth is approximately 9.81 m/s² (acceleration due to
gravity) or 9.81 N/kg (force per unit mass). These are equivalent units. Options A and B
are both correct, making Option C the comprehensive answer.
An object has a mass of 50 kg. What is its weight on Earth?
a. 50 N
b. 490.5 N
c. 5.1 N
d. 500 N
✔️ Correct Answer: B
Rationale:
Weight = Mass × Gravity = 50 kg × 9.81 m/s² = 490.5 N. Option A is incorrect because it
confuses mass with weight. Option C is incorrect because it divides instead of multiplies.
Option D is incorrect because it uses an approximate value of 10 m/s².
A 60 kg astronaut travels to the Moon where gravity is approximately one-sixth of Earth's
gravity. Which statement about the astronaut is correct?
a. The astronaut's mass decreases to 10 kg
b. The astronaut's weight decreases to approximately one-sixth of Earth weight
c. The astronaut's mass increases to 360 kg
d. The astronaut's weight remains the same
✔️ Correct Answer: B
, Rationale:
Mass is constant regardless of location, but weight depends on gravitational field
strength. On the Moon, gravity is weaker, so the astronaut weighs less. Option A is
incorrect because mass does not change. Option C is incorrect because mass does not
increase. Option D is incorrect because weight changes with gravity.
Two forces of 5 N and 12 N act on an object in the same direction. What is the resultant
force?
a. 7 N
b. 12 N
c. 17 N
d. 5 N
✔️ Correct Answer: C
Rationale:
When forces act in the same direction, the resultant force is the sum of the forces: 5 N +
12 N = 17 N. Option A is incorrect because it subtracts the forces. Option B is incorrect
because it ignores the 5 N force. Option D is incorrect because it ignores the 12 N force.
Which of the following is a vector quantity?
a. Distance
b. Speed
c. Velocity
d. Mass
✔️ Correct Answer: C
Rationale:
Velocity is a vector quantity because it has both magnitude and direction. Distance,
speed, and mass are scalar quantities with magnitude only. Options A, B, and D are
incorrect because they are scalar quantities.