Welcome Guest Search | Active Topics |

Tag as favorite
EK 10th Ed. ICE 1 Question 2
Options
Previous Topic Next Topic
Bhawani
#1 Posted : Friday, June 23, 2017 7:26:58 PM
Rank: Newbie

Groups: Registered
Joined: 6/23/2017
Posts: 0

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
To calculate acceleration, why does 100 need to be subtracted from 145 for the force?
Back to top
Report?
jaredenns
#2 Posted : Saturday, June 24, 2017 7:13:28 PM
Rank: Instructor

Groups: Registered
Joined: 6/9/2016
Posts: 0

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi there,

According to Newton's Second Law, the acceleration is determined by the net force. So, if we are lifting the 10 kg disc with a force of 145 N, we still have to account for the object's weight, which points downward. An object's weight is the gravitational force on the object, equal to mass times 10 m/s^2. So, the weight of the disc is 100 N.

Net Force = Force Up - Force Down = Force Applied - Weight = 145 N - 100 N = 45 N

Once we have net force, then we can solve for acceleration.

Hopefully that clarifies things a bit.

Cheers,
Jared Enns
Physics Instructor - MCAT Prep
Back to top
Report?
Users browsing this topic
Guest (2)
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.069 seconds.