Very quick question about lift and apparent weight?

AI Thread Summary
When descending in a lift, you experience a sensation of falling due to gravity, but the lift is also carrying you down. Apparent weight is influenced by the normal reaction force, which changes based on the lift's acceleration. If the lift accelerates downwards faster than 9.8 m/s², your apparent weight would decrease significantly, potentially leading to a feeling of weightlessness. This can affect how blood circulates in the body, as muscles pump blood against gravity. Understanding these dynamics involves applying Newton's second law and analyzing forces in a free body diagram.
sameeralord
Messages
659
Reaction score
3
Hello everyone,

When you go down a lift, are you actually falling down. Is the lift carrying you down, or are you falling down due to gravity towards the lift, if the lift goes too fast would your head crash? Sorry if my thinking is completely wrong.

Ok now apparent weight is from the normal reaction force. Muscles pump blood up via veins and then they fall due to gravity and other factors. So when they fall and hit the interior of the foot, can't you feel it. So isn't apparent not just the normal reaction force.

Thank you :smile:
 
Physics news on Phys.org
To work it out draw a free body force diagram for someone standing on scales and then apply Newtons second law.If the lift is stationary or moving with a steady velocity apparent weight = true weight.If it accelerates upwards apparent weight is bigger and if it accelerates downwards apparent weight is smaller.What do you think might happen if the lift accelerated down at more than 9.8m/s^2?
 

Thread '1:1 versus 2:1 Mechanical Advantage debate'

The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...
View full post »

Thread 'Newton's first law?'

Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?
View full post »

Thread 'Free fall of person in a sled to direct horizontal motion by atmospheric resistance'

Let there be a person in a not yet optimally designed sled at h meters in height. Let this sled free fall but user can steer by tilting their body weight in the sled or by optimal sled shape design point it in some horizontal direction where it is wanted to go - in any horizontal direction but once picked fixed. How to calculate horizontal distance d achievable as function of height h. Thus what is f(h) = d. Put another way, imagine a helicopter rises to a height h, but then shuts off all...
View full post »

Similar threads

I Understanding the physics of a bosun's chair and mechanical advantage
Replies
6
Views
3K
B What is my apparent weight in water?
Replies
14
Views
2K
"Air Pressure" is not "the weight of the air above you"
Replies
27
Views
4K
G forces when falling - proper acceleration question
Replies
11
Views
2K
I Precession of a gyroscope in freefall
Replies
10
Views
3K
Lift: Probably my last question
Replies
7
Views
2K
Engineering Paradox: Weight & Thrust/Weight
Replies
25
Views
5K
How can I lift more than my weight?
Replies
6
Views
4K
B Calculate needed dimensions of table - Center of mass, levers etc
Replies
11
Views
2K
Understanding the Sign of 'g' and 'a': An Apparent Weight Example
2
Replies
51
Views
11K

Hot Threads

Recent Insights

Back
Top