Class 10 FRANK Solutions Physics Chapter 1.4 - Work, Energy, Power and Their Relation with Force
Access Frank Solutions for ICSE Class 10 Physics Chapter 1.4 Work, Energy, Power and their Relation with Force at TopperLearning. Revise chapter terms such as work, power, watt, joule and more through our Physics solutions. Find out whether work done is a vector quantity or a scalar quantity. Through the chapter solutions, our experts also guide you in solving simple calculations on work done using the relevant formula.
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Work, Energy, Power and Their Relation with Force Exercise 37
Solution 1
Force
Solution 2
Yes
Solution 3
Joule
Solution 4
Work
Solution 5
1N, 1m in its own direction
Solution 6
When no net force is applied, the work done which is the dot product of force and displacement is zero.
Work, Energy, Power and Their Relation with Force Exercise 38
Solution 7
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Solution 9
Solution 10
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Solution 15
It is equal to the product of force and the displacement of the point of application of the force in the direction of force.
Solution 16
(i) the magnitude and direction of the applied force, and
(ii) the displacement it produces.
Solution 17
Solution 18
Solution 19
Solution 20
When the angle between the direction of motion and that of the force is 90°;
W = Fd cos 90° = 0
When the angle between the direction of motion and that of the force is 0°;
W = Fd cos 0° = Fd
Hence in the second case, when the angle is 0°; the work done is more.
Solution 21
The displacement of the man and suitcase is along the horizontal direction. Thus, the angle between the displacement and the force of gravity is 90°;
Thus, W = Fd cos 90° = 0
Hence, no work is done against gravity in this case.
Solution 22
Solution 23
W = Fd cos 900 = 0
Solution 24
1 kJ = 103 joules
Solution 25
Solution 26
1 joule of work is said to be done when a force of 1 newton displaces a body through 1 metre in its own direction.
Solution 27
1 joule = 107 erg
Thus the ratio is 107: 1
Solution 28
Solution 29
Solution 30
Applied force, displacement in the direction of the applied force.
Solution 31
(i) In free fall of a body of mass m, under gravity from a height h, the force of gravity (F=mg) is in the direction of displacement (=h) and the work done by the gravity is mgh.
(ii) A coolie lifting a load does work against gravity.
Solution 32
(i) the magnitude and direction of the applied force, and
(ii) the displacement it produces.
Solution 33
Solution 34
Or, W = mgh
Solution 35
Thus, W = Fd cos 900 = 0
Hence, no work is done against gravity in this case; however some work is done against friction.
Solution 36
Solution 37
Solution 38
The SI unit of work is 'joules' and that of power is 'watt'.
Solution 39
(a) joule, watt
(b) power, energy
(c) work
(d) 107
(e) 746
Solution 40
Work, Energy, Power and Their Relation with Force Exercise 39
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Solution 42
Power