STEP 1: Draw a diagram or add all the forces to the diagram given in the question
STEP 2: If the line of action of the force is at an angle to the direction of motion, find the component of the force parallel to the direction of motion
STEP 3: If necessary, resolve the forces acting in the direction of motion to find the magnitude of the force acting on the object
STEP 4: Use W = Fs to find the work done by the force on the object
Calculate the work done against friction as the child pulls the box 5 metres along the floor.
A crate of mass 10 kg is pushed 6 metres up a rough ramp inclined at 15° to the horizontal by a force F N. The crate moves with constant speed along the line of greatest slope. The coefficient of friction between the container and the ramp is 0.2 as shown in the diagram below.
Read the question carefully to decide if the point of application of the force is acting in the direction of motion. Always draw a diagram or add to the diagram given in the question. Check to see if there are any resisting forces.