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Therefore, doing positive work will result in an increase of kinetic energy. This relationship is called the work-energy theorem. Q14. A tennis ball (mass = 0.06 kg) is hit straight upward with an initial speed of 50 m/s. How high would it go if air resistance is negligible? Solve this using the work-energy theorem.
Work-‐Energy Theorem Practice. Relation between KE and W: The work done on an object by a net force equals the change in kinetic energy of the object: W = ΔKE. This relationship is called the work-‐energy theorem. (Adapted from: http://theory.uwinnipeg.ca/physics/work/node3.html)
Topic: The Basics of Work, Energy, and Power. Objectives: To describe the conditions under which positive and negative work are done and to use the work equation to calculate the amount of work done.
work, the body gaining energy has work done on it. Work is given by the force multiplied by the displacement through which the force acts, or: where F = force (N), d = displacement (m)
4.1 Use the work-energy theorem to calculate the magnitude of the velocity of the bullet -block system immediately after the bullet strikes the block, given that the frictional force between the block and surface is 10 N. (5) 4.2 State the principle of conservation of linear momentum in words. (2)
The work energy theorem states that the change in (a) kinetic energy of a particle is equal to the work done on it by the net force. (b) kinetic energy of a particle is equal to the work done by one of the forces acting on it.
Work-Energy Theorem Practice Problems. 1. A squirrel (mass 0.9 kg) is running across the road at a speed 4.0 m/s. What is the squirrel’s kinetic energy? 2. A kangaroo is hopping about downtown Sydney, looking for some grub. If its legs exert a force of 760 N and his legs push a distance of 40 cm, how much work do the kangaroo’s legs do? 3.
