pls answer quickly...........
Answers
Answer:
Known :
Force (F) = 20 N
Displacement (s) = 2 m
Angle (θ) = 0
Wanted : Work (W)
Solution :
W = F d cos θ = (20)(2)(cos 0) = (20)(2)(1) = 40 Joule
Read : Electrostatic force - problems and solutions
2. A force F = 10 N acting on a box 1 m along a horizontal surface. The force acts at a 30o angle as shown in figure below. Determine the work done by force F!
Work done by a force – problems and solutions 2
Known :
Force (F) = 10 N
The horizontal force (Fx) = F cos 30o = (10)(0.5√3) = 5√3 N
Displacement (d) = 1 meter
Wanted : Work (W) ?
Solution :
W= Fx d = (5√3)(1) = 5√3 Joule
3. A body falls freely from rest, from a height of 2 m. If acceleration due to gravity is 10 m/s2, determine the work done by the force of gravity!
Known :
Object’s mass (m) = 1 kg
Height (h) = 2 m
Acceleration due to gravity (g) = 10 m/s
Wanted : Work done by the force of gravity (W)
solution:
W = F d = w h = m g h
W = (1)(10)(2) = 20 Joule
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