High School Physics + more
A machine is any device that makes work easier by changing a force. A machine can do this by increasing the output force, or by increasing the output distance, and sometimes by changing the direction of the input force.
Deriving equations of Gravitational Potential Energy (1)with planet’s surface as the zero level & (2)infinity is chosen as the zero level, 1] If we choose a planet’s surface as the zero level or reference, Gravitational Potential Energy Ep at x has a positive value.
If infinity is chosen as the zero level, Ep has a negative value.
Gravitational potential energy Ep = (mg) × h = mgh (if we choose a planet’s surface as the zero level or reference).
Gravitational potential energy Ep can be expressed as Ep = – G m1m2 / r (if infinity is chosen as the zero level).
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 […]
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 […]
How to Calculate the Mechanical Advantage of Wheel and Axle?
Answer: Mechanical Advantage of Wheel and Axle = M.A = Radius of the wheel/radius of the axle = R/r.
As R > r, the MA of the wheel and axle is always greater than 1.
Here we will obtain or derive an expression for the potential energy stored in the spring, also known as the 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 ΔL are proportional, F = kΔL, where k is a constant. We, therefore, derive the equation of the potential energy of a spring, also known as the elastic potential energy as follows: PE=(1/2)kx2 where k is the spring’s force constant and x is the displacement from its undeformed position.elastic potential energy represents the work done on the spring and the energy stored in it as a result of stretching or compressing it a distance x . The potential energy of the spring PEs does not depend on the path taken; it depends only on the stretch or squeeze x in the final configuration.
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 […]
In this post, we will find the relation between kinetic energy and momentum. We will also derive the momentum-kinetic energy equation or p=√(2mk) equation. This momentum-KE equation presents the relation between momentum(p) and kinetic energy(K). momentum-kinetic energy equation | p=√(2mk) The relation between momentum(p) and kinetic energy(K) of an object of mass m can be […]
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 […]
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 […]
In this post, we will find out the difference between Ideal Mechanical Advantage (IMA) and Actual Mechanical Advantage (AMA). The ratio of load to effort is known as mechanical advantage. ∴ Mechanical advantage (M.A) =Load (W)/Effort (E). If a large load is lifted with a small effort, then the mechanical advantage is greater than one. […]
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 […]
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 […]
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 […]
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, […]
What is the Work done by Gravity on an object having Horizontal circular motion? Is it positive, negative, or zero work?
The mechanical advantage of an inclined plane is calculated as the ratio of the length of the incline and the height of the incline. It can also be calculated using the value of 1/(sin θ), where θ is the angle of inclination.
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 […]
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 […]
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 […]
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, […]
In this post, we will first state the Relationship between mechanical advantage, velocity ratio, and efficiency. Then we will derive the relationship between mechanical advantage, velocity ratio, and efficiency of a machine.
Here you will find Numerical Problems based on Lever’s mechanical advantage. Try to solve and if required refer to the solutions given. We will continuously add newer problems. Formula Used Mechanical Advantage = Effort arm / Load armMechanical Advantage = Load/effort To get the Concepts of fulcrum location for 3 types of levers: read about […]
The Velocity Ratio of a machine and the Velocity Ratio Formula are the topics of this physics article. Also, we will see how the value of the Velocity Ratio varies in the case of speed multiplier machines and Force multiplier machines. Velocity Ratio | Definition of Velocity Ratio The velocity ratio of a machine is […]
In this post, we will define Power (in physics), and list down different formulas of power. We will also solve a sample numerical using the power formula and concept.
What are the types of lever? The types of levers are First Class lever, Second Class lever, and Third Class lever.
In this post, we will talk about the Mechanical advantage formula (MA formula) for different simple machines. Mechanical advantage Formula | MA formula The Mechanical advantage formula (MA formula) can be written as follows: (1) Mechanical Advantage MA = output force/input force (2) Mechanical Advantage MA = resistance force/effort force. The machine uses this resistance […]
In this post, we will find out (a) how to find the weight of a freely falling body (b) How the velocity of a freely falling body changes every second 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 (e) Applicability of Law of conservation of energy for free fall (e) how distance traveled per second varies
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 applied. Work done by a force depends on the 3 parameters: (a) the force applied (b) The […]
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 as per the formula, it’s the ratio of load and effort. The formula of the mechanical advantage(MA) of a lever […]
