355754
Which of the following statement (s) is/are correct for work done to be zero? I. If the displacement is zero. II. If force applied is zero. III. If force and displacement are mutually perpendicular to each other.
1 Only I
2 Both I and II
3 Only II
4 I, II and III
Explanation:
The work done in displacing an object by applying force \(F\) is given by \(W=F \cdot s=F S \cos \theta\) So, work done will be zero, when \(F=0\) or \(S=0\) or \(0=90^{\circ}\)
PHXI06:WORK ENERGY AND POWER
355755
Assertion : Work done depends on angle between force and displacement. Reason : When the force retards the motion of a body, the work done is zero.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(W=F S \cos \theta\), Work done does depend on the angle \(\theta\) between force \(F\) and displacement \(S\). However, the reason provided is incorrect. When a force retards the motion of a body, work is still done, but it is negative because the force and displacement are in opposite directions. So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355756
A body of mass 1 \(kg\) moves from points \(A(2\;m,3\;m,4\;m)\) to \(B(3\;m,2m,5\;m)\). During motion of a body, a force \(F=(2 N) \hat{i}-(4 N) \hat{j}\) acts on it. The work done by the force on the particle during displacement is
355754
Which of the following statement (s) is/are correct for work done to be zero? I. If the displacement is zero. II. If force applied is zero. III. If force and displacement are mutually perpendicular to each other.
1 Only I
2 Both I and II
3 Only II
4 I, II and III
Explanation:
The work done in displacing an object by applying force \(F\) is given by \(W=F \cdot s=F S \cos \theta\) So, work done will be zero, when \(F=0\) or \(S=0\) or \(0=90^{\circ}\)
PHXI06:WORK ENERGY AND POWER
355755
Assertion : Work done depends on angle between force and displacement. Reason : When the force retards the motion of a body, the work done is zero.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(W=F S \cos \theta\), Work done does depend on the angle \(\theta\) between force \(F\) and displacement \(S\). However, the reason provided is incorrect. When a force retards the motion of a body, work is still done, but it is negative because the force and displacement are in opposite directions. So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355756
A body of mass 1 \(kg\) moves from points \(A(2\;m,3\;m,4\;m)\) to \(B(3\;m,2m,5\;m)\). During motion of a body, a force \(F=(2 N) \hat{i}-(4 N) \hat{j}\) acts on it. The work done by the force on the particle during displacement is
355754
Which of the following statement (s) is/are correct for work done to be zero? I. If the displacement is zero. II. If force applied is zero. III. If force and displacement are mutually perpendicular to each other.
1 Only I
2 Both I and II
3 Only II
4 I, II and III
Explanation:
The work done in displacing an object by applying force \(F\) is given by \(W=F \cdot s=F S \cos \theta\) So, work done will be zero, when \(F=0\) or \(S=0\) or \(0=90^{\circ}\)
PHXI06:WORK ENERGY AND POWER
355755
Assertion : Work done depends on angle between force and displacement. Reason : When the force retards the motion of a body, the work done is zero.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(W=F S \cos \theta\), Work done does depend on the angle \(\theta\) between force \(F\) and displacement \(S\). However, the reason provided is incorrect. When a force retards the motion of a body, work is still done, but it is negative because the force and displacement are in opposite directions. So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355756
A body of mass 1 \(kg\) moves from points \(A(2\;m,3\;m,4\;m)\) to \(B(3\;m,2m,5\;m)\). During motion of a body, a force \(F=(2 N) \hat{i}-(4 N) \hat{j}\) acts on it. The work done by the force on the particle during displacement is
355754
Which of the following statement (s) is/are correct for work done to be zero? I. If the displacement is zero. II. If force applied is zero. III. If force and displacement are mutually perpendicular to each other.
1 Only I
2 Both I and II
3 Only II
4 I, II and III
Explanation:
The work done in displacing an object by applying force \(F\) is given by \(W=F \cdot s=F S \cos \theta\) So, work done will be zero, when \(F=0\) or \(S=0\) or \(0=90^{\circ}\)
PHXI06:WORK ENERGY AND POWER
355755
Assertion : Work done depends on angle between force and displacement. Reason : When the force retards the motion of a body, the work done is zero.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(W=F S \cos \theta\), Work done does depend on the angle \(\theta\) between force \(F\) and displacement \(S\). However, the reason provided is incorrect. When a force retards the motion of a body, work is still done, but it is negative because the force and displacement are in opposite directions. So correct option is (3)
PHXI06:WORK ENERGY AND POWER
355756
A body of mass 1 \(kg\) moves from points \(A(2\;m,3\;m,4\;m)\) to \(B(3\;m,2m,5\;m)\). During motion of a body, a force \(F=(2 N) \hat{i}-(4 N) \hat{j}\) acts on it. The work done by the force on the particle during displacement is
