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Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies.
Given two bodies of equal mass,
Height of A = 20 m
Height of B = 30 m
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How can the work done be measured when force is applied at an angle to the direction of displacement?
Work done = Force × component of displacement in the direction of force
Work done, W = Fd cos θ
where,
θ is the angle between force and displacement
What is the main energy transformation that occurs in:
1. Photosynthesis in green leaves;
2. Charging of a battery
1) Light energy is converted into chemical energy.
2) Electrical energy to chemical energy
Which class of levers has a mechanical advantage always greater than one? What change can be brought about in this lever to increase its mechanical advantage?
Class II lever has a mechanical advantage always greater than 1.
To increase mechanical advantage effort arm must be increased and load arm must be decreased.
Write an expression to show the relationship between mechanical advantage, velocity ratio and efficiency for a simple machine?
Relation between mechanical advantage, velocity ratio and efficiency is, 
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