What are the solutions to these work and energy problems?

Click For Summary
SUMMARY

This discussion focuses on solving work and energy problems involving gravitational potential energy and force calculations. The first problem involves a 0.046-kg ball dropped from a height of 6 meters, requiring the application of kinematic equations to determine its velocity at 1 meter above the ground. The second problem pertains to an object dropped from height h, with its velocity calculated at 0.5h. The final problem involves calculating the average force exerted by a football player who expends 100 Joules of energy over a distance of 1.2 meters, necessitating the use of the work-energy principle.

PREREQUISITES
  • Understanding of gravitational potential energy and kinetic energy
  • Familiarity with kinematic equations for velocity calculations
  • Knowledge of the work-energy principle
  • Basic algebra for plugging in values into formulas
NEXT STEPS
  • Study the kinematic equations for motion under gravity
  • Learn about gravitational potential energy and its conversion to kinetic energy
  • Explore the work-energy theorem and its applications
  • Practice problems involving force calculations using the work formula
USEFUL FOR

Students studying physics, educators teaching mechanics, and anyone looking to improve their problem-solving skills in work and energy concepts.

losthelp
Messages
10
Reaction score
0
Work and energy problems :(

can anyone help me w. these, I am completely lost!

A 0.046-kg ball is dropped froma height of 6m above the ground. When it is 1m above the ground, its velocity will be:

An object is dropped from a small height h above the ground. When its height is 0.5h, its velocity will be:

A football player cfan expend 100J energy on the football when he throws it. If the average distance through which eh accelerates is 1.2m what is the average force that he exerts on the ball?

i know these are suppose to be simple but I am compeltey lost :( help please!
 
Physics news on Phys.org


First you need formulas, all this problems are straightforward, so just get the formulas and plug in values.
 

Similar threads

Work done during a collision -- Change in Kinetic Energy & change in Momentum
  • · Replies 1 ·
Replies
1
Views
2K
Avg Power in a Rotational Energy/Work Problem
  • · Replies 6 ·
Replies
6
Views
2K
Potential energy and work relationship
  • · Replies 6 ·
Replies
6
Views
2K
Question about the Kinetic Energy of a baseball in flight
  • · Replies 8 ·
Replies
8
Views
3K
Work Required to Move a Piano Onto a Truck
  • · Replies 1 ·
Replies
1
Views
2K
Conservation of Energy with Gravitational Potential Energy
  • · Replies 6 ·
Replies
6
Views
2K
Confused on potential energy losses and regain.
  • · Replies 1 ·
Replies
1
Views
1K
Conservation of energy problem: Ball rolling down inclined plane and then through a loop-the-loop
  • · Replies 10 ·
Replies
10
Views
3K
Energy/Work Problem: Friction of sliding down pole
  • · Replies 5 ·
Replies
5
Views
4K
Problem involving energy/motion
  • · Replies 19 ·
Replies
19
Views
3K