Register to reply

Kinetic Energy

by feedmeister
Tags: energy, kinetic
Share this thread:
Nov18-07, 09:56 AM
P: 22
Hi all,

This really isn't a homework question, but rather a "coursework" question. It's pretty simple, I'm just trying to understand the concept. It's a workbook problem from my book.

1. The problem statement, all variables and given/known data
A 0.2 kg plastic card and a 20 kg lead cart both roll without friction on a horizontal surface. Equal forces are used to push both carts forward a distance of 1m, starting from rest. After traveling 1m, is the kinetic energy of the plastic cart greater than, less than, or equal to the kinetic energy of the lead cart? Explain.

2. Relevant equations
K.E. = (1/2)m*v^2
F = m*a

3. The attempt at a solution

I think it'd be the same because the velocities would make up for the difference in masses since there's the same amount of force.

If you can explain it to me I'd appreciate it. Thanks.
Phys.Org News Partner Science news on
Bees able to spot which flowers offer best rewards before landing
Classic Lewis Carroll character inspires new ecological model
When cooperation counts: Researchers find sperm benefit from grouping together in mice
Nov18-07, 10:14 AM
HW Helper
P: 4,435
Work done on a body = Force X displacement = Change in KE.
Nov18-07, 10:21 AM
P: 22
Ah, yes I forgot that equation. So I guess I was right.


Register to reply

Related Discussions
Enthalpy, thermal energy, and kinetic vs. potential energy Introductory Physics Homework 6
HELP! ~ Mechanical Energy vs Potential Energy & Kinetic Energy Introductory Physics Homework 4
Mechanical Energy vs Potential Energy & Kinetic Energy Introductory Physics Homework 3
Transformation of Kinetic and Gravitational Potential Energy:Conservation of Energy. Introductory Physics Homework 9
Mechanical Kinetic Energy vs Electrical Potential Energy Introductory Physics Homework 3