Work, Energy and Power — Flashcards
ICSE · Class 11 · Physics
40 flashcards for Work, Energy and Power (ICSE Class 11 Physics) to test yourself on key terms and facts. Part of the ICSE Class 11 Physics syllabus.
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State the scientific definition of work.
Answer
Work is said to be done only when a body acted upon by a force moves actually through some distance in the direction of the force. If there is no displacement, work is zero.
Why is no work done when a coolie carries a load on his head and walks on a horizontal platform?
Answer
The force is vertical, but the displacement is horizontal. The angle between force and displacement is 90 degrees, so W = F s cos 90 degrees = 0. The coolie may feel effort, but the mechanical work ag…
A force of 12 N acts on a body and moves it 5 m in the same direction. Find the work done.
Answer
Given: F = 12 N, s = 5 m, theta = 0 degrees Formula: W = F s cos theta Step 1: W = 12 N x 5 m x cos 0 degrees Step 2: W = 60 J Answer: 60 J…
A force of 20 N acts at 60 degrees to the displacement of 4 m. Find the work done.
Answer
Given: F = 20 N, s = 4 m, theta = 60 degrees Formula: W = F s cos theta Step 1: W = 20 N x 4 m x cos 60 degrees Step 2: cos 60 degrees = 1/2 Step 3: W = 20 x 4 x (1/2) J Step 4: W = 40 J Answer: 40 J…
State the work done by a variable force.
Answer
W = integral from x1 to x2 of F(x) dx. The work done is equal to the area under the force-position graph between x1 and x2.
A variable force F(x) acts along the x-axis from x1 to x2. What does the area under the force-position graph represent?
Answer
The area under the force-position graph represents the work done by the variable force. For a spring or any changing force, this area gives the total work from the initial to final position.
State the dimensional formula and SI unit of work.
Answer
Dimensional formula of work: [M L^2 T^-2] SI unit: joule (J) Also, 1 joule = 1 newton x 1 metre.
Convert 3 joule into erg.
Answer
Given: 1 J = 10^7 erg Step 1: 3 J = 3 x 10^7 erg Answer: 3 x 10^7 erg…
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