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Here goes the list of our posts on Energy Physics and related topics and subtopics.

#### What is a machine and How Machines Make Work Easier?

When we hear the word machine, images of power tools or construction equipment come into our minds. While these are certainly some examples of machines, devices as simple as hammers and screws are also machines. Why are simple tools like hammers and screws considered to be machines? Because like all machines, they also change forces and make work easier. What ...

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#### Gravitational potential energy – concepts & equations when reference varies from the planet’s surface to infinity

Gravitational potential energy, Ep, is the energy of a mass due to its position within a gravitational field. This energy can be released (and converted into kinetic energy) when the body is allowed to fall.In this post, let's find out the concepts & equations when reference varies from the planet's surface to infinity. We will discuss & derive 2 equations: ...

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#### What is the Law of Conservation of Energy and how to derive its equation?

The Law of conservation of energy states that the total energy of an isolated system remains constant. Now in this post, we will discuss this in detail, write its statement, and then derive an equation expressing this law of conservation of energy. So let's begin. Law of Conservation of Energy - Explanation As per the work-energy equation the total energy ...

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#### electronvolt – what is electronvolt(eV) and how is eV related to Joule?

The SI unit of energy joule is too large a unit of energy for the microscopic world. A more convenient unit of energy for the microscopic world is the electronvolt, eV. eV by the way is not part of the SI system. What is electronvolt? | Define electronvolt We define the electronvolt as the work done when a charge equal ...

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#### How to Calculate the Mechanical Advantage of Wheel and Axle?

In this post, we will calculate the mechanical advantage of Wheel and Axle. Now, what is the 'wheel and axle'? The wheel and axle is a simple machine that consists of a wheel attached to a strong cylindrical axle. The radius of the wheel (R) is greater than the radius of the cylindrical axle (r). The wheel and the axle ...

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#### Derive an expression for the potential energy of elastic stretched spring

Here we will obtain or derive an expression for the potential energy of elastic stretched spring. This energy is also known as elastic potential energy. To get this equation, we'll calculate the work done to stretch or compress a spring that obeys Hooke’s law. Hooke’s law states that the magnitude of force F on the spring and the resulting deformation ...

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#### Derivation of Kinetic Energy Equation in a minute | Derive Translational KE equation

The energy possessed by a moving body due to its motion is known as Kinetic Energy. Here we will derive the translational kinetic energy equation which goes like this: K = (1/2) mV2. So let's BEGIN. How to derive the equation of Kinetic Energy? | Derive Translational KE equation Let's take an object of mass m which is at rest ...

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#### What is the Relation between momentum and kinetic energy? | How to derive the momentum-KE equation?

The relation between momentum(p) and kinetic energy(K) of an object of mass m can be expressed with this equation: p = (2mK)(1/2)That means the square root of 2mK gives us the momentum value. Now let's derive the equation that gives the relationship between momentum and kinetic energy. Derive an equation to show the relationship between momentum and kinetic energy | ...

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#### Work-Kinetic Energy Theorem with the Derivation of mathematical expression

Work-Kinetic Energy Theorem with derivation: In this post, we will discuss the special relationship between work done on an object and the resulting kinetic energy of the object and come up with the statement of the work-kinetic energy theorem. We will also see how to derive the equation of the work-kinetic energy theorem.Everyday experience supports this theorem. If we see ...

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#### What is Negative Work? | Friction does negative work – How?

A sign with a vector quantity denotes direction. But, Work is a scalar quantity. So a negative sign with it (i.e. a negative work) has no connection with its direction. Then what is negative work? When work done by an external force on a mass reduces the energy of that mass then we say that the work done is negative ...

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#### Difference between Ideal Mechanical Advantage (IMA) and Actual Mechanical Advantage (AMA)

The ratio of load to the effort is known as mechanical advantage.∴ Mechanical advantage (M.A) =Load (W)/Effort (E). If a large load is lifted with small effort, then the mechanical advantage is greater than one.The effort applied to the machine is used to run the machine parts, to overcome friction, and to do useful work. Thus, the total load is ...

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#### What type of lever is standing on toes? | second class lever in our body

Standing on toes acts as a second class lever (also known as class II or type 2 lever). This is an example of the presence of a lever mechanism in the human body.The foot acting as a lever arm with calf muscle supplying an upward effort, the weight of the body acting as a downward load, and the ball of ...

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#### What type of lever acts when we nod our head? | Nodding of Head as Lever

The nodding of the head acts as a first-class lever (also known as class I or type 1 lever). In this lever, the skull acts as the lever arm. Pivot is the place where our skull meets the top of our spine. And the neck muscles at the back of the skull provide the force (effort) to lift our head ...

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#### What is the use of a lever if its mechanical advantage is more than 1, equal to 1 and less than 1?

If the mechanical advantage of a lever is more than 1, a lever can act as a Force Multiplier. That means using that lever more load can be overcome by applying less amount of effort. Example, Crowbar, Bottle opener, nutcracker If the mechanical advantage of a lever is less than 1, a lever can act as a speed Multiplier. That ...

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#### Comparison of Scissors & shears with their mechanical advantage

Explain why scissors for cutting cloth may have blades longer than handles, but shears for cutting metals have short blades and long handles. - to explain this we need a comparison of Scissors & shears with their mechanical advantage.Scissors and shears apparently may look identical. Both of them belong to the class I lever, having the fulcrum in between load ...

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#### What is the Work done by Gravity on an object having Horizontal circular motion?

What is the Work done by Gravity on an object having Horizontal circular motion? Is it positive, negative, or zero work?We will set up a quick experiment for easy observation. How to set up an experiment to find out work done by gravity on a horizontally circulating object? Let’s tie a piece of stone to one end of a string ...

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#### Mechanical Advantage of Inclined Plane with formula

Mechanical Advantage of Inclined Plane - this is what we will cover in this post. An inclined plane is a simple machine that makes our life easier. But how to find out the Mechanical advantage (MA) of an inclined plane and what is its formula - this is what we will discuss here. In a nutshell, the mechanical advantage of ...

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#### What Is Potential Energy?

What Is Potential Energy?Potential energy is a form of stored energy - it is the energy possessed by a body at rest due to its position or size or shape. By doing work, forces act to increase and decrease the kinetic energy of objects within a system. If the kinetic energy that’s removed can be stored and recovered later, the ...

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#### Forces acting on a mass sliding down an inclined plane – using vector resolution

In this post, we will discuss the forces acting on a mass sliding down an inclined plane. To do this we will take the help of the concepts of Vector Resolution. Here we are not considering the presence of friction. Forces acting on a mass sliding down an inclined plane The first step when setting up the problem is to ...

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#### Work Energy Power – Worksheet problem solution (Q6)

A 10 kg ball is dropped from a height of 10 m. Find (a) the initial potential energy of the ball, (b) the kinetic energy just before it reaches the ground, and (c) the speed just before it reaches the ground. (a) The initial PE = mgh = 10. 9.8 . 10 = 980 J (b) The KE just before ...

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#### Numerical on Work Energy Power solved worksheet class 10 ICSE, CBSE

This post is focused on Numerical Problems on Work, Energy, Power with solutions, and a problem worksheet for you. This is very useful for high school students studying Physics, more precisely for class 10 students of ICSE, CBSE, international boards like IGCSE, state boards, etc.) Numerical Problems on Work, Energy, Power | class 10 ICSE, CBSE | solved i] Find ...

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#### Equation of Efficiency that relates mechanical advantage and velocity ratio of an ideal machine

In this post, we will find out the equation of Efficiency that relates mechanical advantage and velocity ratio of an ideal machine. Equation of Efficiency that relates mechanical advantage and velocity ratio of an ideal machine The efficiency of a machine = Work output / Work input .... (1)Now, Work output = Load x displacement of the load ..... (2)And ...

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#### Numerical Problems on Lever’s mechanical advantage & velocity ratio

Here you will find Numerical Problems on Lever's mechanical advantage & velocity ratio. Try to solve and if required refer to the solutions given. We will continuously add newer problems. Numerical Problems on Lever's mechanical advantage & velocity ratio 1 ) Calculate the mechanical advantage of a class 2 lever such that the length of the rod is 2 meter ...

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#### What is the Velocity Ratio formula of a machine?

Velocity Ratio Formula is the topic of this physics notes. Here we will see what Velocity Ratio (V.R.) is and then quickly state its formula or equation. V.R. is a term related to a machine that gives an idea of whether there is any speed gain or force multiplication or direction change of the effort for that machine. V.R. lets ...

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#### What Is Power? – concepts and units

Power is the rate at which work is done or the rate at which energy is supplied or used. The SI units for power are joules per second, which is defined to be a watt (W), so 1 W = 1 J/s. There are other popular units like Kilowatt and Horse-power. 1 kilowatt = 1000 Watt and 1 Horse-power = ...

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#### Types of levers

Types of levers - Levers are classified according to the relative positions of fulcrum, load, and effort points in the lever body. We will discuss different types of levers with examples in this post. So, let's start. How many types of levers are available? On the basis of the location of fulcrum, load, and effort in the lever body, levers ...

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#### Mechanical advantage Formula of simple machines

In this post, we will talk about the Mechanical advantage formula for different simple machines. Just to give you a quick heads up, the Mechanical Advantage of a machine is the ratio of output force and the input force. In other words, it is the ratio of Load and Effort. Now to understand these in details we need to understand ...

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#### Free fall, Acceleration due to Gravity and Kinetic Energy

In this post we will find out (a) how to find weight of a freely falling body (b) How velocity of a freely falling body changes if we ignore air drag force (air resistance)? (c) Why do we feel weightless during freefall (d) Kinetic energy of a body under free fall How to find the Weight of the body during ...

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#### Work done by a force

In Physics Work is done by a force only if the object on which the force is applied makes a displacement. Without this displacement, work done is zero irrespective of the force you have applied. Work done by a force depends on the 3 parameters: (a) the force applied (b) The displacement and (c) The angle between the line of ...

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#### Mechanical Advantage of a Lever with Formula

This post explains what the Mechanical Advantage of a lever is and finds out its formula. This also covers the general description of Lever terminologies.The mechanical advantage of a lever is the ratio of the load the lever overcomes and the effort a person or system applies to the lever to overcome some load or resistance. In simple words and ...

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