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What does pressure mean in physics?
What is the weight force of gravity?
How is weight measured?
How much pressure is exerted on an object?
What is weight in science & engineering?
Is weight a scalar quantity?
Weight is the size of the force of gravity acting on an object. Weight is a force and so is measured in newtons (N). Weight is measured using a newton spring balance.
- Pressure guide for KS3 physics students
Key points. Pressure is a measure of how concentrated (or...
- Pressure guide for KS3 physics students
Key points. Pressure is a measure of how concentrated (or spread out) a force is. The amount of pressure exerted on an object depends on the force applied and the surface area it is spread...
Weight is the force exerted by gravity on an object, measured in units like pounds or kilograms, while pressure is the force exerted over an area, measured in units like pascals or psi. Difference Between Weight and Pressure. Table of Contents. ADVERTISEMENT. Key Differences.
- 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)
Pressure is the force per unit perpendicular area over which the force is applied. In equation form, pressure is defined as \ (F=PA\). The SI unit of pressure is pascal and \ (1\, Pa = 1 \space N/m^2\).
Brokk Toggerson. This section is available as both video and text. Engage with whichever modality you prefer: the content is the same! Gravity and Weight. Watch on. Gravity is one of the fundamental forces. We’re going to explain gravitational interactions in terms of the idea of the gravitational field, which we indicate by the little letter .
4 days ago · Answer. We can determine the pressure using the formula 𝑝 = 𝐹 𝐴. The force acting is the weight of the sofa. The weight of the sofa is given by 𝐹 = 𝑚 𝑔, where 𝑚 is the mass of the sofa and 𝑔 is the acceleration due to gravity or the gravitational field strength.
