Search results
Work Practice Problems Show all work! No naked numbers! 1) Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do? 2) How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200N? 3) Alex applies 350 N of force to move his stalled car 40 m, how much work did Alex do?
Use the work-energy theorem to calculate a force, a displacement, or a speed for an object moving across a horizontal surface. Includes 9 problems.
This collection of problem sets and problems target student ability to use energy principles to analyze a variety of motion scenarios.
Review the units of work, energy, force, and distance. Use the equations for mechanical energy and work to show what is work and what is not. Make it clear why holding something off the ground or carrying something over a level surface is not work in the scientific sense.
type. The amount of energy transformed (∆E) is called work W. The body losing energy does 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) KE = ½ mv2 Work = Change in Energy = Force × displacement
The graph of force vs. position depends on the particular spring you used, but for most springs will be a straight line. This corresponds to Hooke’s law, or F = – kx, where F is the force applied by the spring when it is stretched a distance x. k is the spring constant measured in N/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)
