Year 12 Physics
Work, energy and power
Work done by a force, kinetic and gravitational potential energy, conservation of energy, power and efficiency.
Work, energy and power free practice
No timer and no account needed. Check each answer as you go, then read the explanation.
1. A 20 N horizontal force pushes a box 4.0 m across a floor. Friction exerts a constant 5.0 N force opposing the motion. How much net work is done on the box?
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