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Simple kinematics question i think i am right just need to confirm

by ihatecats2014
Tags: confirm, kinematics, simple
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ihatecats2014
#1
Aug29-10, 10:36 PM
P: 31
1. The problem statement, all variables and given/known data
At t=0 a ball, initially at rest, starts to roll down a ramp with constant acceleration. You notice it moves 1 foot between t=0 seconds and t = 1 second.
How far does it move between t = 1 second and t = 2 seconds


2. Relevant equations
delta x=vit+1/2at2? since it is constant speed wouldn't acceleration be 0?


3. The attempt at a solution
it seems like it would be 1 foot right?
= 1(1)+1/2(0)(1)2
delta x=1foot?
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rock.freak667
#2
Aug29-10, 10:50 PM
HW Helper
P: 6,202
No the acceleration would not be zero. If it were zero, then the ball would not move.

Quote Quote by ihatecats2014 View Post
1. The problem statement, all variables and given/known data
At t=0 a ball, initially at rest, starts to roll down a ramp with constant acceleration. You notice it moves 1 foot between t=0 seconds and t = 1 second.
Using this information and the same relevant equations, what is the acceleration? (Remember, initially at rest means no initial velocity)
ihatecats2014
#3
Aug29-10, 11:06 PM
P: 31
Quote Quote by rock.freak667 View Post
No the acceleration would not be zero. If it were zero, then the ball would not move.



Using this information and the same relevant equations, what is the acceleration? (Remember, initially at rest means no initial velocity)
would the acceleration be 1? because it went 1 foot in the elapsed time of 1 sec?

then
=0(1)+1/2(1)(1)^2
delta x equals 1/2 foot
this is wrong. i need a hint please

or if the time is 2sec the distance would then be 2 foot. but i think that is still wrong

rock.freak667
#4
Aug29-10, 11:17 PM
HW Helper
P: 6,202
Simple kinematics question i think i am right just need to confirm

Quote Quote by ihatecats2014 View Post
would the acceleration be 1? because it went 1 foot in the elapsed time of 1 sec?
Your equation is x=ut+0.5at2 (u= initial velocity)

Using this equation a≠1 ft/s2.


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