Positive And Negative Work

Q.

A boy was playing with a spongy ball, compressing and releasing it. The work done by the boy on the ball and the ball on the boy respectively at the time of compressing is:

1. Positive, Negative

2. Negative, Positive

3. Positive, Positive

4. Negative, Negative

Q.

A boy tied a string to one of the ends of a box and started sliding the box on a playground. He then observed a circular track and rushed there and completed half revolution of the track with his box. The work done by friction on the box is _____.

1. negative

2. zero

3. positive

4. infinite

Q. The work done by a body is positive when the body displaces in the direction of force applied.

1. False
2. True

Q. What is the work done by a person pushing a rock which is unmoved?

1. Negative work
2. Positive work
3. Zero work
4. Work done cannot be defined

Q. The work done by net force can be negative, zero or positive.

1. True
2. False

Q. The work done is zero when the displacement is normal to the direction of force.

1. False
2. True

Q. The work done by net force can be negative, zero or positive.

1. True
2. False

Q. Match the types of work done with the corresponding direction of displacement with respect to force applied.

1. Same direction
2. No displacement
3. Oppposite direction

Q. The work done by a body is positive when the body displaces in the direction of force applied.

1. False
2. True