Calculations - To lift an object at a constant speed, a force exerted on the object must be equal to its weight. The force exerted on an object can be calculated by:
(Force in newtons) = (mass in kilograms) (force of gravity)
- This equation can be written by using symbols:
F = mg
- Gravity (g) is 9.8 N / kg. - The amount of work done depends on the amount of exerted force and the distance over the applied force. When the force causes the object to move in the same direction as the force, the amount of work done can be calculated by using this equation:
(Work in joules) = (force in newtons) x (distance in metres)
- This equation can be written by using symbols:
W = Fd
- This equation also calculates how much energy is being spent, since the work done is equal to the energy spent.
- The force of gravity exerted on any mass near the surface of Earth can be calculated by:
(Force of gravity) = (mass of object in kilograms) x (the strength of the gravitational field of the Earth)
- To lift an object at a constant speed, a force exerted on the object must be equal to its weight. The force exerted on an object can be calculated by:
(Force in newtons) = (mass in kilograms) (force of gravity)
- This equation can be written by using symbols:
F = mg
- Gravity (g) is 9.8 N / kg.- The amount of work done depends on the amount of exerted force and the distance over the applied force. When the force causes the object to move in the same direction as the force, the amount of work done can be calculated by using this equation:
(Work in joules) = (force in newtons) x (distance in metres)
- This equation can be written by using symbols:
W = Fd
- This equation also calculates how much energy is being spent, since the work done is equal to the energy spent.- The force of gravity exerted on any mass near the surface of Earth can be calculated by:
(Force of gravity) = (mass of object in kilograms) x (the strength of the gravitational field of the Earth)
- This equation can be written by using symbols:
Fg = mg
- Gravity (g) is 9.8 N / kg.
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