Calculating Force for an Exceptional Standing Jump: Physics Homework Problem

  • Thread starter Thread starter PearlyD
  • Start date Start date
  • Tags Tags
    Physics
Click For Summary
To calculate the force exerted by a 66 kg person for a standing jump of 0.80 m, the work-energy principle is applied. The gravitational force acting on the person is calculated as 9.81 m/s² multiplied by their mass, resulting in a force of approximately 649.46 N. The total work done to achieve the jump height is calculated as the force times the jump height, yielding 517.968 J. However, the crouching distance of 0.20 m must also be considered, as it affects the force applied during the jump. Overall, the initial calculations provide a foundation, but further refinement is needed to incorporate the crouching distance effectively.
PearlyD
Messages
18
Reaction score
0

Homework Statement


An exceptional standing jump would raise a person 0.80m off the ground. To do this, what force must a 66 kg person exert against the ground?
Assume the person crouches a distance of 0.20 m prior to jumping,and thus the upward force has this distance to act over before he leaves the ground.



This question i don't even know how to start
can some one explain how to even start it?
 
Physics news on Phys.org


Work = Force * Distance
Force = (9.81)(66)
Work = (9.81)(66)(.80)
Work = 517.968 J

Doesn't account for the crouching distance, but it may be irrelevant, someone else will probably cover that. I hope I went in the right direction with this.
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
View full post »

Similar threads

Calculating the Force of a Jump on the Moon
  • · Replies 10 ·
Replies
10
Views
3K
Calculating Force Required to Perform an Exceptional Standing Jump
  • · Replies 12 ·
Replies
12
Views
6K
Calculating Force for an Exceptional Vertical Jump
  • · Replies 12 ·
Replies
12
Views
5K
How High Can a Dog Jump by Exerting Maximum Force?
  • · Replies 7 ·
Replies
7
Views
3K
Equilibrium of Forces and Torques on Sawhorses Supporting a Person on a Board
  • · Replies 6 ·
Replies
6
Views
2K
Momentum and impulse of jump problem
  • · Replies 11 ·
Replies
11
Views
4K
Calculating Kangaroo Jump Distance: How High Can They Go?
  • · Replies 14 ·
Replies
14
Views
3K
Maximum Jump Height of a 12-kg Dog: A Physics Problem
  • · Replies 2 ·
Replies
2
Views
8K
What Is the Correct Way to Calculate Average Force in a Jumping Scenario?
  • · Replies 4 ·
Replies
4
Views
3K
How to calculate the force exerted by the "tendon" on the "tibia" bone?
  • · Replies 4 ·
Replies
4
Views
1K