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Friday, November 10, 2017

A constant force pushes a block along a horizontal frictionless surface. The block moves from rest through a fixed distance.




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

2 comments:

  1. Kindly solve Mcq 26 of 9702/M/J2017/P13

    Please urgent.

    ReplyDelete
    Replies
    1. go to
      http://physics-ref.blogspot.com/2019/06/a-pipe-of-length-100-cm-is-open-at-both.html

      Delete

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