Learning objective
Define and calculate the work of a constant and a variable force.
Explain the sign of work through the angle between force and displacement.
Master the concepts of average and instantaneous power and the formula $P = Fv$.
Learn to calculate efficiency.
Expected outcomes
Can find the work of a force from $A = Fs\cos\alpha$ and as the area under the $F(x)$ graph.
Calculates the work of gravity, the elastic force and friction.
Determines the power and efficiency of a machine and converts between J, W and kW·h.
Activities
Lecture
Lecture · 1 h 15 min ·
required
Problem solving: mechanical work, power and energy
Practice · 1 h 15 min ·
required
Final test
Test · 20 min ·
required
· pass ≥ 70%
Completion conditions
- Lecture
- Problem solving: mechanical work, power and energy
- Final test — at least 70%