WHAT IS A FORCE?
The push or pull of an object is considered a force. Push or pull come from the objects interacting with one another. Invisible action leading to the motion of an object to a new position from its original position is called Force. It is a vector product, as it has both magnitude and direction.ย ย
Magnitude is the amount of force applied, while the direction is the course of action.
FORMULA OF FORCE:
Mathematically, the force can be expressed as :
F=ma
Where m is the mass of the objectย
a is the accelerationย
F is the force appliedย
Acceleration a is given by,
a = v/t
where v is the velocity of the object,
t is the total time
F =mv/t
Inertia formula is termed asย
p =mv
Therefore,ย ย
F = p/tย
= dp/dt
WHAT DO YOU MEAN BY POWER?
Power is the amount of energy transferred or converted per unit of time. The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft.
From the definition of the power, one watt is equal to one Joule of work done per second. So if P represents the Power in Watts, ฮEย is the change in energy and ฮtย is the time taken in seconds.
FORMULA OF POWER:
Mathematically it can be represented as,
P = W/t
= ฮEย / t
Where,
P is the power ( Watts)
W is the work done (J)
ฮEย is the energy transferred (J)
t is the time (s)
Difference between force and power:
| BASIS FOR COMPARISON | FORCE | POWERย |
| Definitionย | Force is an interaction between two bodies that maintain or change the motion of the body. | Power is the amount of energy transferred or converted per unit of time. |
| Measuring unitย | Newton | Watts |
| Symbolic representationย | F | P |
| Formulaย | F =ma | P =W/t |
| Nature of quantityย | Vector quantityย | Scalar quantity |
| Types | There are two types of forces in nature:โขContact force: Forces that act on a body either directly or through a medium are called contact forces. They include โขMuscular force โขMechanical force โขFrictional forceโขNon-contact force: Forces that act through spaces without making direct contact with the body are non-contact forces. | The power is classified into โขDC power: DC power is defined as the product of the voltage and current. It is produced by the fuel cell, battery, and generator. โขAC power: It is an instantaneous power in an electric circuit that is the rate of flow of energy past a given point of the circuit. In the alternating circuit, energy storage elements such as inductors and capacitors may result in periodic reversals of the direction of energy flow. |
| EXAMPLESย | There are many forces observed in day-to-day life.ย โขGravitational forceย โขNormal forceโขFrictional forceย โขAir dragย โขSpring forceโขThrustโขElectric and magnetic forceย | Examples of power : Sunlight reaches Earth’s surface carries a minimum power of about 1.3kilowatts per square meter (kW/m2) |
