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
A pendulum has a frequency of 4 vibrations per second
Define moment of force
Define a kilowatt hour. How is it related to joule
Two pendulums C and D are suspended from a wire
A satellite revolves around a planet in a circular orbit
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
A brass ball is hanging from a stiff cotton thread
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
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
A boy weighing 40kgf climbs up a stair of 30 steps each 20cm high
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 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