Force, Work, Power, Energy (10)

Turning forces concept; moment of a force; forces in equilibrium; centre of gravity;

Uniform circular motion; Work, energy, power and their relation with force.; Different types of energy

Machines as force multipliers; load, effort, mechanical advantage, velocity ratio and efficiency; simple treatment of levers, pulley systems showing the utility of each type of machine.

Principle of Conservation of energy

Draw a diagram to show a block and tackle pulley system having a velocity ratio
The diagram below shows a pulley arrangement
The diagram below shows a claw hammer used to remove a nail
Two bodies A and B have masses in the ratio 5:1
Name the physical quantity which is measured in calories
Define couple. State the S.I. unit of moment of couple
A body of mass 10 kg is kept at a height of 5 m
A uniform meter scale is in equilibrium
Define moment of force
Define a kilowatt hour. How is it related to joule
A satellite revolves around a planet in a circular orbit
A pendulum has a frequency of 4 vibrations per second
Two pendulums C and D are suspended from a wire
Give one example of each when
A crane A lifts a heavy load in 5 seconds, whereas another crane B
Draw a graph between displacement from mean position and time
The figure below shows a simple pendulum of mass 200 g
Identify the class of the lever shown in the diagram below
State and define the S.I. unit of power
State the energy changes in the following cases while in use
With reference to the direction of action, how does a centripetal force
A block and tackle system of pulleys has velocity ratio 4
The diagram below shows a lever in use
Why is the motion of a body moving with a constant speed around a circular path said to be accelerated
Derive a relationship between S.I. and C.G.S. unit of work
A half metre rod is pivoted at the centre with two weights of 20 gf and 12 gf suspended at a perpendicular distance
A brass ball is hanging from a stiff cotton thread
The distance between two bodies is doubled
Why is a jack screw provided with a long arm
If the power of a motor be 100 kW
Which class of lever will always have MA > 1 and why
A uniform half metre rule balances horizontally on a knife edge
A boy uses a single fixed pulley to lift a load of 50 Kgf to some height
How does uniform circular motion differ from uniform linear motion
A pulley system with VR = 4 is used to lift a load of 175 kgf
Give an example of a non-contact force
How does the magnitude of this non-contact force
With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency
An effort is applied on the bigger wheel of a gear having 32 teeth
A boy weighing 40kgf climbs up a stair of 30 steps each 20cm high
A stone of mass ‘m’ is rotated in a circular path with a uniform speed
What kind of pulleys are A and B
A pulley system has three pulleys