Laws Of Motion Question 3
Question: Assertion: Pulling a lawn roller is easier than pushing it. Reason: Pushing increases the apparent weight and hence the force of friction.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: A
Solution:
Suppose the roller is pushed .
The force F is resolved into two components, horizontal component FH which helps the roller to move forward, and the vertical component acting downwards adds to the weight.
Thus weight is increased.
But in the case of pull [fig ] the vertical component is opposite to its weight.
Thus weight is reduced.
So pulling is easier than pushing the lawn roller.
