Work is the force exerted on an object times the distance over which the force is exerted:
W = Fx
, where W is the work in Nm = Joule. Work done to lift an object of mass m a height h: W = Fgh = mgh.
How do you calculate work done by mass?
Let us calculate the work done in lifting an object of mass m through a height h, such as in Figure 1. If the object is lifted straight up at constant speed, then the force needed to lift it is equal to its weight mg. The work done on the mass is then
W = Fd = mgh.
How do you find work given distance?
Work can be calculated with the equation:
Work = Force × Distance
. The SI unit for work is the joule (J), or Newton • meter (N • m). One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.
How do you calculate work?
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 the formula for work when force and distance are known?
Physicists provide an exact mathematical definition of their notion of work. In words: Work is equal to the force that is exerted times the distance over which it is exerted. In equation form:
work (joules) = force (newtons) x distance (meters)
, where a joule is the unit of work, as defined in the following paragraph.
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.
How do you solve for powers?
To solve basic exponents,
multiply the base number repeatedly for the number of factors represented by the exponent
. If you need to add or subtract exponents, the numbers must have the same base and exponent.
What is work and its unit?
Work is force applied over distance. … Work is a mechanical manifestation of energy. The standard unit of work is
the joule (J)
, equivalent to a newton – meter (N · m). This reduces to one kilogram-meter squared per second squared (kg · m
2
/s
2
or kg · m
2
· s
– 2
) in base International System of Units (SI) units.
What is transferred when work is done?
To do work requires that an agent exert a force on an object over a distance. When work is done,
energy
is transferred from the agent to the object, which results in a change in the object’s motion (more specifically, a change in the object’s kinetic energy).
What is Newton formula?
Newton’s second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass,
F = ma
, is the basic equation of motion in classical mechanics.
How can we find work done when force is variable?
- The work done by a constant force of magnitude F on a point that moves a displacement d in the direction of the force is the product: W = Fd.
- Integration approach can be used both to calculate work done by a variable force and work done by a constant force.
How do we calculate energy?
The formula that links energy and power is:
Energy = Power x Time
. The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second.
What is gravity’s formula?
The one most people know describes Newton’s universal law of gravitation:
F = Gm
1
m
2
/r
2
, where F is the force due to gravity, between two masses (m
1
and m
2
), which are a distance r apart; G is the gravitational constant.
What is the formula of time?
To solve for time use the formula for time,
t = d/s
which means time equals distance divided by speed.
What is area formula?
| Table 2. Area Formulas | Shape Formula Variables | Square A =s2 s is the length of the side of the square. | Rectangle A=LW L and W are the lengths of the rectangle’s sides (length and width). | Triangle A=12bh b and h are the base and height |
|---|
What are the 3 equations for power?
We now have three equations for electrical power, with two derived from the first using the Ohm’s law equation. These equations are often used in problems involving the computation of power from known values of electric potential difference (ΔV), current (I), and resistance (R).
