Mechanics Newton's 2nd law question

AI Thread Summary
To solve the problem of a 200kg load lifted through 50m, the first step is to determine the acceleration during the initial stage of uniform acceleration. The tension in the cable can be calculated using the formula T=200a+1960, but finding the acceleration is essential before calculating tension. The motion consists of three stages: acceleration, constant speed, and deceleration, with the total distance equaling 50m. Standard SUVAT equations should be applied to each stage to derive the necessary values. Understanding these stages will clarify the relationship between acceleration, speed, and tension in the cable.
pianogirl
Messages
8
Reaction score
0

Homework Statement


A load of 200kg is lifted through 50m by a vertical cable. The load accelerates uniformly from rest for 20 seconds, travels at constant speed for 10 seconds then decelerates to rest in a further 10 seconds. Find the maximum speed attained and the tension in the cable at each stage.



Homework Equations


F=ma and maybe some SUVAT ones?



The Attempt at a Solution


I started using F=ma so that for the first stage I got T=200a+1960 but soon after that I got a bit confused.

Help would be really appreciated because I'm stuck!
Thanks!
 
Physics news on Phys.org
Hi pianogirl! :smile:

Forget the tension … you need to find the acceleration before you can find the tension. :wink:

Write out the standard constant acceleration equations for the three stages of motion, plus the equation that says the three distances add to 50m.

What do you get? :smile:​
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »

Similar threads

Rocket acceleration problem: confused about Newton's 2nd Law
Replies
42
Views
5K
Newton's law problem: Helicopter lifting a box with a rope
Replies
5
Views
3K
Is it friction or tension acting on the person hanging on a rope?
Replies
4
Views
989
Newton's 2nd law with oscilations
Replies
17
Views
2K
Unbalanced force to find altitude of airplane
Replies
4
Views
2K
Rank forces according to magnitude: Newton's 2nd/3rd laws
Replies
5
Views
7K
Santa's Sleigh (Newton's 2nd Law-1D) Acceleration, Horizontal Motion
Replies
6
Views
3K
Using Newton's 2nd Law to find acceleration
Replies
5
Views
4K
Solving for Masses in an Atwood Machine
Replies
8
Views
2K
Explain speed limits on curved ramp with Newton's Laws
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top