# What will happen to the weight of the child if the lift moves up with constant speed?

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## What will happen to the weight of the child if the lift moves up with constant speed?

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.

## What is the formula for lift going up?

N = mg if the elevator is at rest or moving at constant velocity. N = mg + ma if the elevator has an upward acceleration. N = mg – ma if the elevator has a downward acceleration.

## What is an 80 kg man stands in a lift?

Hence the net acceleration is 9.8 − 1.5 = 8.3 m / s 2 . Therefore the man weighs down with a force 80 × 8.3 = 664 N . Hence the floor pushes up with the same force. Since the elevator is moving with a constant velocity there is no fictitious force.

## What will be change in weight of a body in an elevator?

Ans:The simplest answer is that your weight does not change while you travel in a lift. The force with which the Earth pulls down on you due to gravity, your weight, does not change with speed or acceleration.

## When an elevator accelerates upward what happens to your apparent weight?

If the elevator is accelerating, the apparent weight and the true weight are not equal. When the elevator accelerates upward, the apparent weight is greater than the true weight, as Figure 4.16b shows. Conversely, if the elevator accelerates downward, as in part c, the apparent weight is less than the true weight.

## What will happen to the apparent weight of a person in a lift when the lift is accelerating downwards?

Thus, the apparent weight of the man becomes zero. This is because both the man and the lift are moving downwards with same acceleration ‘g’ and so there are no forces of action and reaction between the person and the lift.

## What is the formula for weight in lift?

Assertion :The apparent weight of a body of mass m in an elevator moving with a downward acceleration ‘a’ is R=m(g−a) Reason: The part of weight (mg) spent on producing downward acceleration ‘a’ is ma. Therefore apparent weight =mg−ms=m(g−a).

## How do you calculate lift in physics?

## How do you calculate weight formula?

To calculate the weight, use the following general formula: W = mg. Here, “W” is the weight of the object, “m” is the mass of the object, and “g” is the acceleration due to gravity.

## How much can a 70 kg male lift?

For example, a 70-kilogram person lifting 100-kilograms on a bench can lift 1.42 times their body weight.

## When a boy of weight 60 kg is standing in a lift if the lift begins to move up?

This means that the boy will NOT EXPERIENCE ANY PSEUDO-FORCE ! Hence, the apparent weight of the boy will be equal to the actual weight of the boy.

## What is the total mass of an elevator with a 80kg man?

The total mass of an elevator, with a 80 kg man in it, is 1000 kg.

## What is the weight of a man in elevator?

Thus, the apparent weight of the man becomes zero. This is because both the man and the lift are moving downwards with same acceleration ‘g’ and so there are no forces of action and reaction between the person and the lift. Hence a person develops a feeling of weightlessness when he falls freely under gravity.

## Why is weight different on an elevator?

The overall acceleration is up, so the acceleration is positive. There are two forces in action, your weight down (-mg) and the supporting normal force. The scale reads the normal force, so it reports your weight as greater than it was at rest. The same two forces are at work as when the elevator was accelerating up.

## Why are we heavier in an elevator?

This is an application of Newton’s second law to the forces felt in an elevator. If you are accelerating upward you feel heavier, and if you are accelerating downward you feel lighter.

## What happens to the period when the lift is moving upwards at constant velocity?

While going up in a lift the effective acceleration due to gravity increases, which decrease the time period.

## Does your apparent weight change when you ride an elevator moving at constant speed?

The force exerted by the scale is known as apparent weight; it does not change with constant speed.

## What happens when lift is greater than weight?

If lift is greater than your weight, the plane shifts upward. If thrust is greater than drag, the aircraft will speed up, and subsequently, if drag is greater than the thrust, you’ll slow down. Lift is the force that counteracts the weight of an object in order to keep it in the air.

## What would happen if weight is greater than lift?

If drag is greater than thrust, the aircraft will lose speed and eventually descend. When lift and weight are equal and opposite, the airplane is in a state of equilibrium. If lift is greater than weight, the aircraft will climb. If weight is greater than lift, the airplane will descend.