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What is the work done by the weight if a body is moving at constant speed over a firctionless surface?
Wiki User
∙ 9y ago
If the object's speed is constant, then its kinetic energy is too.
So none of its energy has been robbed to do external work.
Wiki User
∙ 9y ago
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Are you agree that your weight is equivalent to the friction force. Why?
No. On a horizontal surface the normal force is equal to weight. If you are moving at constant velocity you only overcome frictional force, which is not equal to weight. This is easier to see on an incline. At some point an object will slide at constant velocity down the incline. This is related to trig functions of the angle of incline multiplied by the weight which is always less than the weight.
What the apparent weight if the lift moves downward with constant speed?
If you are in a lift (elevator) moving at constant speed, whether up or down, and you have no visual contact with the outside, then you don't know that the lift is moving, and no physical experiment can detect the motion. Your apparent weight is the same as when you're at 'rest'.
What does it mean to say mass and weight are porportional to each other?
That assumes gravity doesn't change. To say that two quantities, "a" and "b", are proportional means that you can write an equation: b = ka (for some constant "k"). In the case of weight: weight = mass x gravity In this case, "gravity" is the constant. That means that for different objects, the weight / mass ratio is always the same. Close to Earth's surface, this constant of proportionality - the gravity - is approximately 9.8 newton/kilogram. If you go far away from Earth, perhaps onto the surface of other planets, gravity is NOT constant, and the statement that "mass and weight are proportional" is not true.
How do you measure mass of objects?
mass = weight ÷ gravity Since the gravitational pull is relatively constant near the surface of the earth, you can weigh the object, then divide the weight by the gravitational acceleration (9.8 m/sec2 near the earth's surface).
What is the weight of a person whose mass is 1200 g?
The weight of 120g of mass, on or near the earth's surface, is (0.12 x 9.8) = 1.18 newtons (rounded)It would be about 0.2 newton on the surface of the moon.In a spacecraft moving at a constant speed, the same 120g would weigh zero.
Are you agree that your weight is equivalent to the friction force. Why?
No. On a horizontal surface the normal force is equal to weight. If you are moving at constant velocity you only overcome frictional force, which is not equal to weight. This is easier to see on an incline. At some point an object will slide at constant velocity down the incline. This is related to trig functions of the angle of incline multiplied by the weight which is always less than the weight.
What the apparent weight if the lift moves downward with constant speed?
If you are in a lift (elevator) moving at constant speed, whether up or down, and you have no visual contact with the outside, then you don't know that the lift is moving, and no physical experiment can detect the motion. Your apparent weight is the same as when you're at 'rest'.
What happens to your weight if you move from the equator of the earth and start moving towards the equator?
In that case, your weight remains absolutely constant and does not budge one iota.
Is the force required to keep a rocket ship moving at a constant velocity in deep space equal to the ship's weight?
No. Without friction or air resistance, no force is required to keep an object moving at a constant velocity. Also, by the way, just thought we should mention: In deep space, the ship has no weight.
What does it mean to say mass and weight are porportional to each other?
That assumes gravity doesn't change. To say that two quantities, "a" and "b", are proportional means that you can write an equation: b = ka (for some constant "k"). In the case of weight: weight = mass x gravity In this case, "gravity" is the constant. That means that for different objects, the weight / mass ratio is always the same. Close to Earth's surface, this constant of proportionality - the gravity - is approximately 9.8 newton/kilogram. If you go far away from Earth, perhaps onto the surface of other planets, gravity is NOT constant, and the statement that "mass and weight are proportional" is not true.
Why don't we notice a difference between mass and and weight on Earth?
Because gravity is relatively constant anywhere on Earth's surface.
Why don't we notice a difference between mass and weight on earth?
Because gravity is relatively constant anywhere on Earth's surface.
How do you measure an object mass?
mass = weight ÷ gravity Since the gravitational pull is relatively constant near the surface of the earth, you can weigh the object, then divide the weight by the gravitational acceleration (9.8 m/sec2 near the earth's surface).
How do you measure mass of objects?
mass = weight ÷ gravity Since the gravitational pull is relatively constant near the surface of the earth, you can weigh the object, then divide the weight by the gravitational acceleration (9.8 m/sec2 near the earth's surface).
Why do you have to exert extra force to get a heavy object moving and then have to keep applying force to keep it moving at constant velocity?
the heavier and the bigger the object the more force you need to use to keep it moving . the less weight and the smaller an object is the less force you need to use to keep it moving. it always depends on the weight of the object and the size of the object.
What is the weight of a person whose mass is 1200 g?
The weight of 120g of mass, on or near the earth's surface, is (0.12 x 9.8) = 1.18 newtons (rounded)It would be about 0.2 newton on the surface of the moon.In a spacecraft moving at a constant speed, the same 120g would weigh zero.
Does the weight of an apple increases or decreases or remain constant when taken to the top of mountain?
the weight will decrease
