Why do we feel heavier or lighter at differenthis parts of the lift?

[animerawkz]

Hi, i am currently doing a project on these questions.


1)why do we feel heavier when the lift startes to move up?

2) why do we feel normal in the middle?

3) why do we feel lighter when the lifts comes to a stop?


although i know that the three laws of Newton is somehow related to it, i still can't find the connection between them.

all types of help and explanation is greatly appreaciated..

thanks

 

[daniel_i_l]

The weight that you feel is equal to the Normal force that the floor pushes you with. When you're in an elevator for example, when it first starts moving up it accelerates and you feel that acceleration as weight. The acceleration up makes the Normal force get bigger (f=ma). In the middle of the ride you're in constant motion so you don't feel anything unusual, constant speed does't have any effect on the Normal force. When you come to a stop you deaccelerate, this causes a force in the oppisite direction of the normal force (which is in the direction of the movement) and so you feel lighter.

 

[kyle8921]

I can provide some insights into why we feel heavier or lighter at different parts of a lift. This phenomenon is due to the effects of gravity and acceleration on our bodies.

1) When the lift starts to move up, we feel heavier because our bodies are experiencing an acceleration in the upward direction. This acceleration is caused by the lift's motor, which is pulling the lift and its contents (including us) upwards. According to Newton's second law of motion, F=ma, where F is the force, m is the mass, and a is the acceleration. In this case, the force (F) is the lift's motor pulling the lift and its contents, and the acceleration (a) is the upward movement. As a result, our bodies feel heavier as they are being pulled upwards by the lift's motor.

2) In the middle of the lift, we feel normal because the lift is moving at a constant velocity, meaning there is no acceleration acting on our bodies. According to Newton's first law of motion, an object will continue to move at a constant velocity unless acted upon by an external force. In this case, the lift is moving at a constant velocity, and our bodies are also moving at the same velocity, so we do not feel any change in weight.

3) When the lift comes to a stop, we feel lighter because our bodies are experiencing a deceleration in the upward direction. This deceleration is caused by the lift's brakes, which are slowing down the lift and its contents. According to Newton's second law of motion, F=ma, where F is the force, m is the mass, and a is the acceleration. In this case, the force (F) is the lift's brakes slowing down the lift and its contents, and the acceleration (a) is the deceleration in the upward direction. As a result, our bodies feel lighter as they are no longer being pulled upwards by the lift's motor.

In summary, the feelings of heaviness or lightness in a lift are due to the effects of gravity and acceleration on our bodies, as described by Newton's laws of motion. I hope this explanation helps with your project.