Work, energy, power. Chapter II review
Answers are for parents and teachers.
1
A force of 120 N moves a body 6 m. Work in J?
720
2
A 5 kg body at 8 m (g = 10 N/kg). Potential energy in J?
400
3
A 2 kg body at 6 m/s. Kinetic energy in J?
36
4
A motor does 5000 J in 25 s. Power in W?
200
5
Write six formulas from Chapter II with their units in a table.
Sample: v = s : t (m/s); F = m · g (N); p = F : S (Pa); F_A = ρ · g · V (N); A = F · s (J); N = A : t (W).