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WEEK EIGHT
DYNAMICS
CONTENT
(a) Work, Power and Energy: Impulse and momentum.
(b) Projectiles: Trajectory of projectiles; greatest height reached; Time of flight; Range and Projection along inclined plane.
SUB TOPIC: WORK, POWER AND ENERGY: IMPULSE AND MOMENTUM.
Work, Power and Energy
Work: the work done (W) is defined as the product of the force (F) and the displacement or distance (d) must be in the direction of the force.
⇒ Workdone (W) = Force (F) displacement (d). ⇒W = F . The unit of work is Joule (J).
Examples:
- How much work is done by a force of 18N that moved a load of 500kg through a displacement of 6m?
Solution:
F = 180N d = 6m ⇒ W = fd = 180(6) = 1080J.
- A particle whose mass is 34kg is acted upon by a force. If the particle moves an upward distance of 100m in the line of action of the force, find the workdone. (take g = 10m/s2 .
Solution: f = ? m = 34kg g = 10m/s2
F = mg = 34(10) = 340N
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