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- Weight is a consequence of the universal law of gravitation: any two objects, because of their masses, attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
www.britannica.com/science/weight
People also ask
What is the weight force of gravity?
Why is weight a consequence of the universal law of gravitation?
Is weight a force or a density?
What is the difference between weight and density?
How did physics understand the force of gravity?
How is weight measured in physics?
weight = mass × gravity. Weight, like other forces, is measured in newtons. When one measures the weight of an object in an elevator, one is required to look at weight as the measure of the sum or difference of the acceleration of gravity and of the surface the object is resting on.
- Overview
- What is weight?
- Is weight different from mass?
- Example 1: Airplane weight
- Example 2: Finding mass
Weight is another word for the force of gravity.
What is weight?
Weight W is just another word for the force of gravity Fg . Weight is a force that acts at all times on all objects near Earth. The Earth pulls on all objects with a force of gravity downward toward the center of the Earth. The magnitude of the force of gravity can be found by multiplying the mass m of the object by the magnitude of the acceleration due to gravity g=+9.8m s2 .
[Why isn't g negative?]
This force of gravity Fg=mg (or "weight") is exerted on all objects by the Earth regardless of which way those objects are moving, and what other forces are exerted on the objects. In other words, there will be a gravitational force of magnitude mg exerted downward on all objects near the Earth whether they are falling down, flying up at an angle, sitting at rest on a table, or accelerating upward in an elevator. There may be other forces that contribute to the acceleration of the object, but the force of gravity is always present.
[What if we go into outer space?]
Weight W is just another word for the force of gravity Fg . Weight is a force that acts at all times on all objects near Earth. The Earth pulls on all objects with a force of gravity downward toward the center of the Earth. The magnitude of the force of gravity can be found by multiplying the mass m of the object by the magnitude of the acceleration due to gravity g=+9.8m s2 .
[Why isn't g negative?]
This force of gravity Fg=mg (or "weight") is exerted on all objects by the Earth regardless of which way those objects are moving, and what other forces are exerted on the objects. In other words, there will be a gravitational force of magnitude mg exerted downward on all objects near the Earth whether they are falling down, flying up at an angle, sitting at rest on a table, or accelerating upward in an elevator. There may be other forces that contribute to the acceleration of the object, but the force of gravity is always present.
[What if we go into outer space?]
Yes, weight is different from mass. Weight W is the force of gravity Fg exerted on an object. Mass m is a measure of the inertia of the object (i.e. how much it resists changes in velocity). They are related since larger masses will have larger weights due to W=mg . For example, a mass of 2kg will have a weight of magnitude W=(2 kg)(9.8m s2)=19.6 N .
The weight of an object will change if the object is brought farther away from Earth, or placed on a different planet, since the force of gravity on the object will change. However the mass of the object will remain the same regardless of whether the object is on Earth, in outer space, or on the Moon.
An airplane of mass 4,500 kg is taking off, flying through the air accelerating forward and upward. There is a thruster force of 6,700 N on the plane in the direction of motion and an air resistance force of 4,300 N .
What is the force of gravity on the airplane during takeoff?
The force of gravity is always nothing more nor less than mg regardless of any other forces or accelerations involved. So we can find the force of gravity on the plane (i.e. weight) by simply using,
Fg=mg(use the formula for weight)
An African forest elephant has a weight of 25,000 N .
What is the mass of the African forest elephant?
Weight is another word for the force of gravity mg . We can solve for the mass using the formula W=Fg=mg.
W=mg(use the formula for weight)
25,000 N=m(9.8 m s2)(plug in values for weight and g)
m=25,000 N(9.8 m s2)(solve for mass m)
Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
Oct 23, 2024 · Newton’s law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them. Isaac Newton put forward the law in 1687.
This is how we will deal with weight force and gravitational forces in this class, but I thought it relevant to bring up why the moon goes around the earth, how this is connected to falling objects, because it demonstrates the power of fundamental ideas.
