Acceleration Problem: Solve for U & A

  • Thread starter Thread starter kazuya99
  • Start date Start date
  • Tags Tags
    Acceleration
AI Thread Summary
The discussion revolves around calculating the acceleration of a free-fall object using the formula s = ut + 1/2at², with given parameters including a distance of 0.02m, time of 0.163 seconds, and a card length of 0.1m. The user is uncertain about the initial velocity (U), questioning if it should be zero. They mention obtaining an acceleration value of 9.15, which they suspect may not be accurate. Additionally, the impact of air resistance on lighter objects is highlighted, suggesting that results may vary based on the object's mass. Accurate calculations must consider these factors to determine the correct acceleration.
kazuya99
Messages
1
Reaction score
0

Homework Statement


I have been given a set of results to analyse, regarding acceleration of a free fall object in a piece of paper, (100g mass, 10cm card) falling through a light gate at different heights, i am having problems with working out the acceleration using formulae.
Distance from gate = 0.02m
Time = 0.163 seconds.
U = 0 i presume..or maybe not(part of my problem)
S = 0.1 (the length of the card)


Homework Equations


s = ut + 1/2at(squared)


The Attempt at a Solution


I have got 9.15 once but i think it was a coincedence.
 
Physics news on Phys.org
For the lighter objects, you have to take the air resisatance into account. The answer you got correct, would probably have been for a heavier object cause the air resistance is negligible for them.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Thread 'Struggle to understand the concept of the question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Solving for Work Done When Accelerating a Mass
Replies
3
Views
778
Auto-Closing Gate (Relative Acceleration problem homework)
Replies
42
Views
4K
Calculating Acceleration: Solving SUVAT and a Constant Homework Statement
Replies
9
Views
2K
Experiment Investigating Newton's 2nd Law
Replies
17
Views
3K
Two cars driving toward each other (non-uniform speed)
Replies
5
Views
7K
Linear and angular acceleration problems.
Replies
8
Views
4K
Find initial velocity and acceleration of a bike
Replies
4
Views
2K
How high will UT bounce on a bungee jump from the Golden Gate Bridge?
Replies
6
Views
2K
B Finding Gravitational Acceleration
Replies
13
Views
1K
Finding time with distance, initial velocity and acceleration
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top