Therefore, the horizontal friction force F fric is the only net force acting on the body to get work done. 2) A man is pushing a lawn mower across his yard. In general, if a strong force causes an object to move very far, a lot of work is done, and if the force is small or the object doesnt move very far, only a little work is done. The work done by the tractor to move the wagon the given distance was 12 000 000 J, which can also be stated as mega-Joules: 12.0 MJ. We know from Newtons second law equation, F ma (substituting now for F). W Fd(1) W (12 000 N)(1000 m) W 12 000 000 Nm. We know that the Work done by force (F) is equal to the change in kinetic energy. The normal force and gravitational force, which act perpendicularly, cancel each other since they are opposite. The work can be found using the formula: W Fd cos. In the more general case where the electric field and angle can be changing, the expression must be generalized to a line integral: More detail on variable field The work done by friction formula is obtained using net forces and also a work-energy theorem. If the distance moved, d, is not in the direction of the electric field, the work expression involves the scalar product: In the case of constant electric field when the movement is directly against the field, this can be written Now we can find the work done by using the work formula. Solution: As given in the question: Force, F 10 N, Displacement, d 2 m, (So, W (Work done) F times d ) i.e. Solution: In this situation, the force is at the angle of 60o with respect to its movement. Q.1: Compute the work done if 10 N of force acts on the body showing the displacement of 2m in the direction of the force. The change in voltage is defined as the work done per unit charge against the electric field. Work done by an electric force by transfering a charge in an electric field is equal to the difference of potential energies between the starting position A and the final position B. Work formula is used to compute work done, force or displacement in any problem. HyperPhysics***** Electricity and Magnetism This association is the reminder of many often-used relationships: More general case
The electric field is by definition the force per unit charge, so that multiplying the field times the plate separation gives the work per unit charge, which is by definition the change in voltage. Work Done by Electric field Work and Voltage: Constant Electric Field The case of a constant electricfield, as between charged parallelplate conductors, is a good exampleof the relationship between workand voltage.
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