Here, on this page, you can use a web-based Mechanical Energy Calculator. It separately calculates total Potential energy and total Kinetic energy. Then adds them and shows total Mechanical energy. Mechanical Energy Calculator Mass (kg): Velocity (m/s): Height (m): Calculate Reset How to use the calculator? Enter 3 input values, Mass (in kg), Velocity (in […]
In this post, we have a set of Class 9 Physics Work and Energy Numericals with solutions. We will first see a list of formulas, and then we will solve a set of work and energy numericals.
Here, we will discuss the Energy unit used while counting food calories.
Question: Write on Second Class Lever Mechanical Advantage
We will now solve a set of numerical problems based on the kWh calculation formula. In other words, basically, these numericals are related to the calculation of the consumption of electrical energy (part of the procedure to produce electric bills).
Commercial unit of energy class 9. The commercial unit (or trade unit) of energy is kilowatt-hour which is written in short form as kWh. Kilowatt-hour is usually used as a commercial unit of electrical energy.
There are different ways energy is stored. Hence, it can be said that there are different types of energy stores.
Calculating Electrical Energy consumption & Units like KW-h
Electric power of an electrical appliance or circuit tells us the rate at which electrical energy is consumed by it per unit time. This is denoted by P and measured using the SI unit of power watt or one joule per second. For example, a bulb of 100 watts power consumes electrical energy at the […]
In mechanics, we can also express power in terms of force and velocity.
In this post, we will list and solve a set of Conservation of Energy problems. These are basically numerical problems that need to be solved using the principle of Conservation of Energy.
Solar energy is converted into electricity using photovoltaic (PV) cells or concentrating solar power plants. Photovoltaic cells convert sunlight directly into electricity. solar energy for home Individual photovoltaic (PV) cells are combined in modules of about 40 cells to form a solar panel; 10 to 20 solar panels are used to power a typical home. […]
Let’s see how Fishing rod acts as a specific class of lever, and why it is used. When we use a fishing rod to cast a line, the rod works as a class 3 lever. Fulcrum and load are at 2 opposite ends of the fishing rod. Effort (force) is applied in between fulcrum and […]
Crowbar – One of the simplest kinds of lever is the crowbar, which is a class 1 lever. We use a crowbar to lift very heavy objects off the ground. The fulcrum of the crowbar is in between the effort and the load. The distance between fulcrum and effort(force applied) is called the effort arm, […]
All three classes of levers make work easier, but they do so in different ways. In this post, we will discuss a few distinguishing pointers of three types of levers. And, these pointers will help to compare three classes of levers structurally and functionally. Compare levers belonging to three classes – In a first-class lever, […]
Some of the machines you use every day are made up of several simple machines. Two or more simple machines that operate together form a compound machine. Look at the can opener in Figure 1. Compound machine – a can opener To open the can, you first squeeze the handles together. The handles act as […]
Gear as a Simple Machine – Many machines make use of gears. Gears can be used to increase or decrease the rotational effects of a force.
In this post, we will discuss three types of pulleys, and how they operate, and how they differ in their operation and utilities. The types we will discuss are (1) Fixed Pulleys, (2) Movable Pulleys, (3) the Block and Tackle.
In this post, we will briefly mention the equations valid for elastic collisions. We can use these equations to solve numerical problems related to elastic collisions. The Equation for the conservation of momentum (for elastic collision) Now, to solve problems involving one-dimensional elastic collisions between two objects, we can use the equation for the conservation […]
The image below shows a list of equations and formulae from the chapter “Energy” of the GCSE Physics syllabus. This is also helpful for all other equivalent boards like CBSE, ISC, ICSE. Equations to learn from Energy chapter of physics syllabus
In this post, we will first find out what the efficiency of a machine means, and then we will solve numerical problems using the concept and formula of the efficiency of machines. If a machine, such as an electric motor, is used to raise a load, electrical energy must be provided to the motor. This […]
In this post, we will draw different types of Potential Energy Diagrams. Each of these diagrams is based on a specific equation of potential energy. For elementary courses and the College Board exams, the most important types of potential energy are gravitational potential energy and spring potential energy, also known as “harmonic oscillator potential energy.” […]
Energy is defined as the capacity to do work. The various forms of energy can be classified as:• Mechanical (kinetic and potential)• Heat• Radiant (electromagnetic)• Chemical (potential)• Sound• Electrical/magnetic• Nuclear In the following sections, we will discuss each of the above-mentioned forms of energy. Mechanical energy Mechanical energy includes both kinetic and potential energy. Friction […]
In this post, we will derive the equation of the total energy of an orbiting body, and then will solve a numerical problem using the formula derived. Derive the formula of the total energy of an orbiting body (or satellite) To calculate the total energy of an orbiting body (say a satellite) we have to […]
In this post, we will briefly discuss the science behind the operating principle of the microwave oven. This marvelous invention somehow heats only the soft parts of the food and leaves the inorganic and hard materials, like ceramic and the surfaces of bone, at approximately the same temperature. A neat trick, indeed, but how is […]
In this post, we will solve a few interesting numerical problems based on specific heat capacity. Learn more about Specific heat capacity here. Solving numerical problems using specific heat capacity formula Question 1] A tank holding 30 kg of water is heated by a 3 kW electric immersion heater. If the specific heat capacity of […]
Here, we will see how the Load-extension graph of a body can help us to calculate the energy stored in a deformed material. We will take two Load-extension graphs for this. Energy stored in a deformed material that obeys Hooke’s law The first load-extension graph (figure 1a) belongs to a body that obeys Hooke’s law, […]
Let’s discuss the application of forces to change the shape of an object and the concept of elasticity related to this shape change. We will cover the stretching of spring as a case study. If one force only is applied to an object then the object will change speed or direction. If we want to […]
In this post, we will discuss how the conservation of energy is maintained in levers and other machines. A machine is a device used to multiply forces or simply to change the direction of forces. The concept that underlies every machine is the conservation of energy. A machine cannot put out more energy than is […]
A pulley is a grooved wheel with a rope, chain, or cable running along the groove. A pulley can change the direction of the input force or increase the output force, depending on whether the pulley is fixed or movable. A system of pulleys can change the direction of the input force and make the […]
In some situations, the use of conservation of energy can be a much simpler method to solve projectile motion problems than using the kinematics equations. Solving projectile motion problems makes use of the fact that Ek + Ep = constant at every point in the object’s flight (assuming no loss of energy due to friction). […]
In this post, we will discuss how transfers between kinetic energy and potential energy happen in a simple pendulum. We will also discuss Energy Conservation in a Simple Pendulum. Finally, we will derive the equation for the maximum speed of the pendulum bob. How Transfer between KE and PE happens in a simple pendulum? A […]
Energy is transferred or transformed from one energy form to another via an energy pathway. In this post, we will briefly discuss the following topics: (a) different forms of energy (b) different mechanisms of energy transformation or conversion or transfer (c) Numerical problems related to energy conversion or transformation with the solution. Here let’s quickly […]
Let’s find out some important one-liner definitions from the work-energy-machine chapter in physics. work, energy, simple machine – definitions Note: Here is the link to one useful post in this blog where you will find a good collection of solved numerical problems on energy conversion or transformation.
Of all simple machines, the mechanical advantage is easiest to calculate for pulleys. To find out the mechanical advantage of a Pulley, simply count the number of ropes supporting the load. That is the IMA or Ideal Mechanical Advantage of Pulley. Once again we have to exert force over a longer distance to multiply force. To […]
Here we enlist important key equations or formulas from the Work, Energy, Power & Simple Machines chapter. Equations related to Work, Power and the Work-Energy Theorem Let’s examine how doing work on an object changes the object’s energy. We will use cases related to a piece of rock to apply different equations from work & […]
The screw shown in the Figure is actually a lever attached to a circular inclined plane. The lever part of these screws is a screwdriver. The distance between screw threads is called pitch and has the symbol P. L is the radius of the screw head surface. The effort is applied at the screw head surface with a turning effect using […]
This Gravity and Mechanical energy Notes [PDF] is primarily for the 10th grade physics syllabus of different international boards. This also covers the class 10 physics syllabus on Gravity and Mechanical energy for boards like ICSE, CBSE, etc. This physics class note covers the theoretical as well as the numerical part of this important chapter. […]
This Work-Energy-Power Notes [PDF download] is primarily for the grade 12 or 12th-grade syllabus of different international boards. This also covers the class 11 physics syllabus on work, energy, and power for boards like ICSE, CBSE, etc. This physics class note covers the theoretical as well as the numerical part of this important chapter. We […]
A wedge is a simple tool in the shape of a triangle. In other words, a wedge is simply two inclined planes back to back. Figure 1 shows the simple formulas for calculating the IMAs of these machines. The mechanical advantage formula for a wedge is dependent on its geometry: IMA = L/t MA of a wedge = […]