Negative Work
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Q. 71.A force f=10+2x acts on a particle moving in straight line on x axis. The work done by this force during a displacement from x=0 tox=3m is
Q.
The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:
(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.
(b) work done by gravitational force in the above case,
(c) work done by friction on a body sliding down an inclined plane,
(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity.
(e) work done by the resistive force of air on a vibrating pendulum in bringing it to rest.
Q. 2. A car is moving on a rough horizontal road.
i)Draw Free Body diagram of the car.
ii) Discuss the nature of work done by each
iii Force acting on the car.
Q. a rigid body is acted upon by a horizontal force which is inversely proportional to the distance covered s . the work done by this force is proportinal to
Q. What should be the angle of banking of a circular track of radius 600m which is designed for cars at an average speed of 180km/h ?
Q. 1 . Is external force always necessary for work to be done ?
2. Why is work done by a varying force
during a round trip not necessarily zero?
3. The position (x) of a particle of mass 1kg moving along x-axis at time t is given by (x=1by 2 t2) metre. Find the work done by force acting on it in time interval from t=0 to t=3s.
2. Why is work done by a varying force
during a round trip not necessarily zero?
3. The position (x) of a particle of mass 1kg moving along x-axis at time t is given by (x=1by 2 t2) metre. Find the work done by force acting on it in time interval from t=0 to t=3s.
Q. Forces can do negative work.
- False
- True
Q. 
The applied force F is enough to move, both block A and B together.The frictional force between A nad B does ________ work on A and _________ work on B.
The applied force F is enough to move, both block A and B together.The frictional force between A nad B does ________ work on A and _________ work on B.
- positive, positive
- positive, negative
- negative, negative
- negative, positive
Q. Forces can do negative work.
- False
- True
Q. Assertion : A body is moved from x=2 to x=1, under a force F=4x, the work done by the force is negative.
Reason: Force and displacement are in opposite directions.
Reason: Force and displacement are in opposite directions.
- Both Assertion and Reason are true and the Reason is correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but the Reason is false
- Assertion is false but the Reason is true
Q. The Undertaker brags about stopping a moving car with bare hands. To prove himself he stands infront of a moving car coming towards him and surprisingly stops the car in 10 seconds after initial contact.The work done by him in this duration will be
- positive
- negative
- zero
- can't be said.
