# How do you find the weight of a person in an elevator?

## Why do you feel heavier or lighter when riding in an elevator?

If you stand on a scale in an elevator accelerating upward, you feel heavier because the elevator’s floor presses harder on your feet, and the scale will show a higher reading than when the elevator is at rest.

## What is the apparent weight of a person when an elevator is accelerating upwards?

If the elevator accelerates upward, a is positive, and the equation shows that the apparent weight is greater than the true weight. If the elevator accelerates downward, a is negative, and the apparent weight is less than the true weight. If the elevator falls freely, , and the apparent weight is zero.

## What is the formula of apparent weight?

The apparent weight of an accelerating object is the vector sum of its real weight and the negative of all the forces that produce the object’s acceleration a = dv/dt. wapparent = wreal – ma.

## What happens to your weight when you are in a lift which goes down?

When the lift goes down the weight of the body decreases because when the lift goes down there is a force called pseudo force which pushes lift upward and results in a decrease in weight.

## Will a fast moving person feel heavy?

Einstein used relativity to show that as you approach the speed of light times beats slower, space contracts and you get heavier. The faster you move, the heavier you get. Energy of motion made you become heavier. This is called mass-energy equivalence.

## When a lift is accelerating up the weight of man standing on floor of the lift is?

Case 1: If the lift is going up with acceleration a. So the man’s apparent weight inside it increases when the lift accelerates upwards.

## What is the apparent weight felt by a person in an elevator?

The apparent weight of a body in an elevator moving with some downward acceleration is less than the actual weight of a body.

## What is the apparent weight of the person when the elevator is moving upwards with a uniform velocity V?

From the above explanation and given condition when person in an elevator is moving at constant speed in such case the net acceleration will be zero. Thus we can say that person’s weight when he is in a moving elevator will not change because the apparent weight of the person will be equal to its true weight.

## When a person is standing on a scale the magnitude of what force is displayed by the scale?

When you stand on a scale, the scale measures your force of gravity AKA weight. This measurement is influenced by Earth’s gravitational force of 9.8N[down] .

## How do you calculate work done by an elevator?

The work done by the elevator over the 100 meters is easily calculable: W = mgh = (1000)(9.8)(100) = 9.8×105 Joules. The total time of the trip can be calculated from the velocity of the elevator: t = = = 25 s.

## What would a scale read in a falling elevator?

The scale will read the Normal force which is less than it was at rest.

## How do you find weight of an object without a scale?

Place the object you want to weigh in 1 cup, then fill the other cup with water until it balances with the object. Then, measure the amount of water you put in the cup in milliliters. The number of milliliters of water will equal the number of grams the object weighs.

## How do you calculate true weight and apparent weight?

Accordingly, the apparent weight of an object that is accelerating is equal to the vector sum of its true weight and the negative of all of its acceleration forces. ‘M’ represents mass minus mass times frame acceleration multiplied by the real weight of that mass.

## How do you calculate weight example?

Weight is a measure of the force of gravity pulling down on an object. It depends on the object’s mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object’s weight in Newtons (N) and m is the object’s mass in kilograms.

## What is the apparent weight of a person?

The apparent weight of a person inside a lift is W1 when lift moves up with certain acceleration and is W2 when lift moves down with same acceleration. The weight of person when lift moves up with constant speed is A Wi+W2 YOUR ANSWER W – W2.

## How do you calculate true weight in physics?

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.

## What is the apparent weight of a person in free fall?

The true weight–the gravitational force that the earth exerts on the object–remains. What is zero is the apparent weight, which is the magnitude of the contact force supporting an object. That’s what is meant by the term “weightless”–the apparent weight is zero, not the “true” weight.

## Does weight increase acceleration?

Heavier things have a greater gravitational force AND heavier things have a lower acceleration. It turns out that these two effects exactly cancel to make falling objects have the same acceleration regardless of mass.

## Does mass change in elevator?

The Weight of the body in an elevator moving downwards increases while its mass remains the same. The Weight and the Mass of the body in an elevator moving downwards do not change.

## Why does the weight of a body in the lift become zero when its cable breaks?

Solution : If the cable of the lift breaks suddenly the weight of the man would become zero because the system would all begin to accelerate downward due to the force of gravity. All objects in the freefall accelerate downward with the same magnitude.

## What is the reaction between a man and a lift if the lift is falling freely?

For a freely falling lift, its accelerations will be g. i.e. the man feels weightless so, for freely falling, the acceleration of the body does not depend on the man. Similarly, the ball will have acceleration = acceleration due to gravity.