Question 1
A constant force
pushes a block along a horizontal frictionless surface. The block moves from rest
through a fixed distance.
What is the relationship between the final
speed v of the block and its mass m?
Reference: Past Exam Paper – June 2017 Paper 13 Q16
Solution:
Answer: C.
v2 = u2 + 2as
Since the block moves from
rest, u = 0.
v2 = 2as
So, v2 ∝ a
Since a constant force is
applied, F = ma, giving a = F/m
So, acceleration a ∝ 1/m
Replacing the relationship
a ∝ 1/m into the equation involving velocity,
v2 ∝ 1 / m
v ∝ 1 / √m
Kindly solve Mcq 26 of 9702/M/J2017/P13
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