Work and Energy

Get the most by viewing this topic in your current grade. Pick your course now.

?
Examples
Lessons
  1. W=ΔEmech=Fd:\bold{W = \Delta E_{mech} = F_\parallel d:} Calculating work
    1. A 1170 kg car travels at 11.0 m/s.
      1. How much work needs to be done on the car to accelerate it to 24.0 m/s?
      2. What is the net force acting on the car that accelerates it, if the acceleration is uniform and happens over 95.0 m?
    2. A 5.50 kg box slides across a floor at 12.0 m/s. Friction slows the box to 2.00 m/s after is has travelled 13.0 m. Find the work done on the box and the force of friction acting on the box. 
    3. A 2.50 kg box is initially at rest at the top of a 30.0° slope and reaches a speed of 11.5 m/s when it slides 12.0 m down the slope. Find the force of friction acting on the box.
  2. W=ΔEmech=Fd:\bold{W = \Delta E_{mech} = F_\parallel d:} Calculating work with force applied at an angle
    A force of 885 N pulls on a box at an angle of 28.0° above the horizontal. 115 N of friction acts on the box as it slides 19.0 m. How much work does the 885 N force do on the box?