What is work done, pressure and energy? please this time ans and also ans previous ques.
Answers
Work:-
Definition Work is said to be done when a force applied to an object moves that object.
Formula We can calculate work by multiplying the force by the movement of the object.
W = F × d
Unit The SI unit of work is the joule (J).
Energy
Definition In physics, we can define energy as the capacity to do work.
Formula For the potential energy the formula is
P.E. = mgh
Unit The SI unit of energy is joules (J), which is named in honour of James Prescott Joule.
Work is said to be done when a body or object moves with the application of external force. We can define work as an activity involving a movement and force in the direction of the force. For example, a force of 30 newtons (N) pushing an object 3 meters in the same direction of the force will do 90 joules (J) of work.
Formula of Work:-
When we kick a football, we are exerting an external force called F and due to this force (kick), the ball moves to a certain distance. This disposition of ball from position A to B is known as displacement (d). This work is said to be done and can be calculated as W = F × d
Work = Force × Displacement = F × d
Power:-
Definition Power can be defined as the rate at which work is done i.e. energy converted.
Formula The formula for power is
P = W/t
Unit The unit of power is watt (W).k
Energy:-
Definition In physics, we can define energy as the capacity to do work.
Formula For the potential energy the formula is
P.E. = mgh
Unit The SI unit of energy is joules (J), which is named in honour of James Prescott Joule.
Pressure:-
Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid. The pressure exerted on a floor by a 42-pound box the bottom of which has an area of 84 square inches is equal to the force divided by the area over which it is exerted; i.e., it is one-half pound per square inch. The weight of the atmosphere pushing down on each unit area of Earth’s surface constitutes atmospheric pressure, which at sea level is about 15 pounds per square inch. In SI units, pressure is measured in pascals; one pascal equals one newton per square metre. Atmospheric pressure is close to 100,000 pascals.
Explanation:
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