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The push force has the same direction as the displacement of the object because the push force does a positive work. In another hand, the friction force has the opposite direction with a displacement of the object so that the friction force does a negative work. Work done by push force :
State the condition when the work done by a force is (a) positive, (b) negative. Explain with the help of examples.
High school physics. NEW. Hands-on science activities. NEW. AP®︎/College Biology; ... Work example problems. Work can be negative! Conservation of energy. Work/energy problem with friction. Intro to springs and Hooke's law. Potential energy stored in a spring.
1. Friction: When an object moves against a surface, friction acts in the opposite direction to the motion, causing negative work. For example, when you slide a book across a table, the frictional force between the book and the table does negative work on the book, slowing it down. 2.
See a collection of solved examples for this topic on our website buzztutor.com. Example 1. A box is dragged horizontally across a floor by a 100 N force acting parallel to the floor. What is the work done by the force in moving it through a distance of 8 m. F = 100 N. S = 8 m. Since F and S are in the same direction,
We can now determine the work done by the force of friction: And we find that the force of friction did negative work (it reduced the kinetic energy of the skier).
For an incorrect statement, the opposite is true: the net work done to the particle must be zero or negative. Positive work is done so this is incorrect.
