How do you calculate weight and height?
Body Mass Index is a simple calculation using a person’s height and weight. The formula is BMI = kg/m2 where kg is a person’s weight in kilograms and m2 is their height in metres squared. A BMI of 25.0 or more is overweight, while the healthy range is 18.5 to 24.9. BMI applies to most adults 18-65 years.
How is work done calculated?
Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton. meter (N. m).
What is transferred when work is done?
Work is the measure of energy transfer when a force (F) moves an object through a distance (d). So when work is done, energy has been transferred from one energy store to another, and so: energy transferred = work done.
What is the symbol of work done?
symbol J
What is positive work done?
When force and displacement are in the same direction, the work performed on an object is said to be positive work. Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.
In which situation is work done?
Work is done whenever a force or a component of a force results in a displacement. No component of the force is acting in the direction of motion when the book is moved horizontally with a constant velocity. The force and the displacement are independent. No work is done by the hand on the book.
What is work done class 9?
Work done on an object is defined as the product of the magnitude of the force acting on the body and the displacement in the direction of the force. W = F.s. If a force acting on a body causes no displacement, the work done is 0. For example, pushing a wall.
How is Class 9 work calculated?
Work Done
- Work Done. •
- Work done = force × distance.
- = F × s. 1 Joule = 1 Newton × 1 metre.
- • Work done by a force acting obliquely is equal to W = F cos θ × s. •
- Energy. •
- Power. •
What do you mean by free fall class 9?
When an object is dropped from a certain height, it begins to fall towards Earth’s surface under the influence of gravitational force. Such a motion of an object is called free fall.
What you mean by free fall?
In Newtonian physics, free fall is defined as the motion of an object where gravity is the only force acting upon it. A skydiver may be pulled towards earth by gravity, but they are also affected by air resistance, a force opposing their downward movement.
What is Free Fall explain with example?
Examples of objects in free fall include: An object dropped at the top of a drop tube. An object thrown upward or a person jumping off the ground at low speed (i.e. as long as air resistance is negligible in comparison to weight).
What do you mean by free fall very short answer?
A free falling object is an object that is falling under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. Free-falling objects do not encounter air resistance.
What is the example of zero work?
1) A simple example of zero work is when you stand holding a bag in your hands and do not move it. Your hands apply a force on the bag to balance the force of gravity exerted on it but since there is no displacement of the bag, the work done on it by you (your force) and also the gravity is zero.
When we can say no work is done?
Plus zero degrees over here. But if the displacement that is when we are applying force over here, if the body goes up instead of going this side then with heater becomes the angle between the force and the displacement becomes 90 degrees if that happens, then the work is not done.
What is no work done?
No work, as understood in this context, is done unless the object is displaced in some way and there is a component of the force along the path over which the object is moved. Holding a heavy object stationary does not transfer energy to it, because there is no displacement.
What is no work force give example?
Zero work is defined when force and displacement are perpendicular to one another and when force or displacement is zero. Example: The force acts in a downward direction, When we hold an object and walk, When displacement operates in the forward direction.
What happens to the body on which work is done?
The total work done is equal to change or increase in Kinetic energy. If kinetic energy increases, potential energy decreases… So,the total energy will be constant… It won’t change….
When work is done on the body its energy?
It is only something that one object does to another. Work changes the amount of mechanical and internal energy possessed by objects. When work is done on a system or object, energy is added to it. When work is done by a system or object, it gives some of its energy to something else.
When is work done?
In summary, work is done when a force acts upon an object to cause a displacement. Three quantities must be known in order to calculate the amount of work. Those three quantities are force, displacement and the angle between the force and the displacement.