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- The force acting on an object due to the pull of gravity from a massive object like a planet. The force acts towards the centre of the planet and is measured in newtons (N). of an object is the gravitational force between the object and the Earth. The weight of an object depends upon its mass and the gravitational field strength.
www.bbc.co.uk/bitesize/guides/z6x48xs/revision/2Gravitational forces - Gravity and weight - 3rd level Science ...
People also ask
What is weight & gravitational force?
What is the force of gravity on an object?
What is the difference between weight and force of gravity?
What is weight in physics?
How does gravitational force affect distance between objects?
Why is weight a consequence of the universal law of gravitation?
Mar 4, 2015 · Weight is a quantity that you measure for a particular object, while gravity is a measure of how curved is the spacetime where that object is living. To understand better this difference, think about a light beam traveling along the space.
- 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)
Jul 21, 2022 · Weight is the force generated by the gravitational attraction of the earth on the airplane. We are more familiar with weight than with the other forces acting on an airplane, because each of us have our own weight which we can measure every morning on the bathroom scale.
Oct 17, 2024 · Weight, gravitational force of attraction on an object, caused by the presence of a massive second object, such as the Earth or Moon. 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.
- The Editors of Encyclopaedia Britannica
Feb 3, 2023 · All objects having mass attract each other with force known as the gravitational force. It is quite noticeable in astronomical objects such as Sun, Earth, and Moon that have enormous masses. The reason is that the force is proportional to the products of the objects’ masses.
The units of force are newtons, the units of mass are kilograms, and therefore the units of the gravitational field must be newtons over kilograms, or people will say it newtons per kilogram. So, let’s review the fundamental features of this gravitational field.
The weight of an object is the gravitational attraction between Earth and the object. The gravitational field is represented as lines that indicate the direction of the gravitational force; the line spacing indicates the strength of the field.
