STD X – FORCE, WORK, POWER AND ENERGY – EINSTEIN
About Course
FORCE
A Force is that physical cause which changes or tends to change either the size or shape or the state of rest or motion of the body.
From the point of view of an application, they are 2 types, Contact and Non-Contact forces. SI Unit of Force – Kg ms-2 or N (Newton).
Contact Forces | Non-Contact Forces
Frictional Force | Normal Reaction Force | Tension Force | Spring Force
Gravitational Forces | Electrostatic Force | Magnetic Force
Uniform Circular Motion
The movement of an object in a circular path, with a constant speed, is known as uniform circular motion.
A bike moving around a circular path is in a circular motion. The bike moving in a circular path with uniform speed is known as uniform circular motion.
Circular Motion
Motion of an object along a circular path.
Circular motion is an accelerated motion because the direction of the velocity changes continuously.
If a body moves on a circular path with uniform speed, it is called uniform circular motion.
The acceleration of this body is known as centripetal Acceleration which is directed towards the center of the circle.
WORK POWER AND ENERGY
Everyday meaning of work is some activity that requires physical or mental effort. But according to physics, the definition of work is more precise and unambiguous. In Physics, if a force displaces an object, the work is said to be done.
The SI unit of work done = Newton(N) X metre(m) = joule(J)Energy is the capacity to do work. Energy is the cause and work is an effect. Therefore both work and energy have the same units, which is joule (J) in the SI system and erg in the CGS system. Kinetic energy and potential energy are the two main types of energy.
Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done.
MACHINES
Simple machines can be regarded as the elementary “building blocks” of which all more complicated machines are composed. They can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.
Inclined Plane
An inclined plane is a sloping surface that behaves like a simple machine whose mechanical advantage is always greater than 1.
Pulley
A Pulley is one of the original simple machines.
The original primary use for pulleys was to make it easier to lift heavy items. A pulley is a simple machine made with a wheel and a rope, cord, or chain.
Pulleys can be found everywhere, helping us in making our tasks easier. In addition to lifting things, pulleys can be used singly or with many pulleys working together in order to transport people or things.
Single fixed pulley | Single movable pulley | Combination of pulleys | Block and tackle system
Levers
The axis, about which the lever turns, passes through a point of the lever which is called the fulcrum (F)
This point does not move, but remains fixed when the lever is in use
A lever is a rigid, straight or bent bar which is capable of turning about a fixed axis
Principle of lever
Moment of load about fulcrum = moment of effort about fulcrum
Course Content
FORCE – 11 MARCH 2023 – MOMENT OF FORCE, COUPLE
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23:23
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13:03
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04:12
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07:13
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21:36
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02:37
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03:43
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06:00
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13:04
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23:11
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QUESTION SET – FORCE – WORKSHEET – SET A
FORCE – 18 MARCH 2023 – CENTRE OF GRAVITY AND UNIFORM CIRCULAR MOTION
WORK,POWER AND ENERGY – 25 MARCH – WORK AND POWER
WORK POWER ENERGY – 01 MARCH – INTERCOVER OF ENERGY AND WORK ENERGY THEOREM
WORK POWER ENERGY – 08 – APRIL – BASED ON NUMERICALS
WORK POWER ENERGY – 22 – APRIL – BASED ON NUMERICALS
MACHINES 29 – APRIL – INTRODUCTION TO MACHINE, LEVER PULLY
MACHINE – 06 MAY – INTRODUCTION OF PULLEY – SINGLE FIXED PULLEY
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