Mathematically, the concept of work done W equals the force f times the distance (d), that is W = f. d and if the force is exerted at an angle θ to the displacement, then work done is calculated as
W = f . d cos θ
.
What are the three work formulas?
Those three quantities are force, displacement and the angle between the force and the displacement. The work is subsequently calculated as force
•displacement•cosine(theta)
where theta is the angle between the force and the displacement vectors.
What is the formula to calculate the work done?
The formula for work is ,
work equals force times distance
. In this case, there is only one force acting upon the object: the force due to gravity. Plug in our given information for the distance to solve for the work done by gravity.
What is current formula?
The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as
I = V/R
. The SI unit of current is Ampere (Amp).
What is energy formula?
The energy stored in an object due to its position and height is known as potential energy and is given by the formula:
P.E. = mgh
.
Unit
. The SI unit of energy is Joules (J).
What is formula for mass?
Mass is always constant for a body. One way to calculate mass:
Mass = volume × density
. Weight is the measure of the gravitational force acting on a mass.
What is work and its examples?
Work is force applied over distance. Examples of work include
lifting an object against the Earth’s gravitation, driving a car up a hill, and pulling down a captive helium balloon
. Work is a mechanical manifestation of energy. The standard unit of work is the joule (J), equivalent to a newton – meter (N · m).
How do we calculate energy?
In classical mechanics, kinetic energy (KE) is
equal to half of an object’s mass (1/2*m) multiplied by the velocity squared
. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s
2
.
What is Ohm’s law state?
Ohm’s law states that
the current through a conductor is proportional to the voltage across the conductor
. … V=IR where V is the voltage across the conductor and I is the current flowing through it.
What is resistivity formula?
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l;
ρ = RA/l
. … Thus, in the metre-kilogram-second system, the unit of resistivity is ohm-metre.
What are types of current?
There are two kinds of current electricity:
direct current (DC) and alternating current (AC)
. With direct current, electrons move in one direction. Batteries produce direct current. In alternating current, electrons flow in both directions.
Does energy have a formula?
| P.E. Potential Energy | h Height |
|---|
What is E mc2 used for?
Mass can be converted into pure energy
.
This is the second meaning of the equation, where E = mc
2
tells us exactly how much energy you get from converting mass. For every 1 kilogram of mass you turn into energy, you get 9 × 10
16
joules of energy out, which is the equivalent of 21 Megatons of TNT.
What is the formula for volume in science?
Density offers a convenient means of obtaining the mass of a body from its volume or vice versa; the mass is equal to the volume multiplied by the density (M = Vd), while the volume is
equal to the mass divided by the density (V = M/d)
.
What is the SI unit of mass?
The SI unit of mass is
the kilogram (kg)
. … Thus, the SI unit of the quantity weight defined in this way (force) is the newton (N).
What is the formula of time?
The formula for time is given as
[Time = Distance ÷ Speed]
. To calculate the speed, the time formula will be molded as [Speed = Distance Travelled ÷ Time].
