Newton's laws of motion -- Force of gravity on a skydiver

AI Thread Summary
The discussion centers on calculating the force of gravity acting on a skydiver, using the formula force = mass x acceleration. A mass of 75 kg and an acceleration due to gravity of 9.8 m/s² results in a force of 735 N. Participants clarify that the force of gravity remains constant regardless of whether the skydiver is in free fall or after landing, as it only changes with a change in mass. The conversation emphasizes understanding the principles behind Newton's laws of motion. Overall, the calculations and concepts discussed reinforce the consistency of gravitational force in this context.
kara123
Messages
21
Reaction score
4
Homework Statement
A 75 kg skydiver jumps out of an airplane. Calculate the force of gravity acting on him when he jumps and after he has landed. Explain any differences
Relevant Equations
Fnet=ma
I think you would do force of gravity= mass x acceleration

acceleration of gravity= 9.8 m/s
mass 75 kg
75kg x 9.8 m/s
=735 N

i don't know if that's right but i have no idea how to calculate it after he lands, any help would be greatly appreciated!
 
Physics news on Phys.org
kara123 said:
i don't know if that's right but i have no idea how to calculate it after he lands
Looks good to me. Question for you: Does the force of gravity change when he lands?
 
kara123 said:
... i have no idea how to calculate it after he lands, any help would be greatly appreciated!
It's a trick question. Knowing that, take a shot at it.
 
Doc Al said:
Looks good to me. Question for you: Does the force of gravity change when he lands?
it does not so it would remain the same after he lands then. The force of gravity would only change in this situation if the mass changes?
 
kara123 said:
it does not so it would remain the same after he lands then. The force of gravity would only change in this situation if the mass changes?
Right! As @russ_watters said, it's kind of a trick question.
 
Reply
  • Like
Likes russ_watters
Thread 'Minimum mass of a block'

Thread 'Minimum mass of a block'

Here we know that if block B is going to move up or just be at the verge of moving up ##Mg \sin \theta ## will act downwards and maximum static friction will act downwards ## \mu Mg \cos \theta ## Now what im confused by is how will we know " how quickly" block B reaches its maximum static friction value without any numbers, the suggested solution says that when block A is at its maximum extension, then block B will start to move up but with a certain set of values couldn't block A reach...
View full post »

Thread 'Electric field due to charges between 2 parallel infinite planes'

TL;DR Summary: Find Electric field due to charges between 2 parallel infinite planes using Gauss law at any point Here's the diagram. We have a uniform p (rho) density of charges between 2 infinite planes in the cartesian coordinates system. I used a cube of thickness a that spans from z=-a/2 to z=a/2 as a Gaussian surface, each side of the cube has area A. I know that the field depends only on z since there is translational invariance in x and y directions because the planes are...
View full post »
Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Thread 'Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations'

Figure 1 Overall Structure Diagram Figure 2: Top view of the piston when it is cylindrical A circular opening is created at a height of 5 meters above the water surface. Inside this opening is a sleeve-type piston with a cross-sectional area of 1 square meter. The piston is pulled to the right at a constant speed. The pulling force is（Figure 2）： F = ρshg = 1000 × 1 × 5 × 10 = 50,000 N. Figure 3: Modifying the structure to incorporate a fixed internal piston When I modify the piston...
View full post »

Similar threads

Unbalanced force to find altitude of airplane
Replies
4
Views
2K
Understanding Newton's 2nd Law of Motion
Replies
6
Views
2K
Static Friction Required to Keep the System from Moving (Two Boxes)
Replies
16
Views
3K
Newton's Laws of motion -- Bicyclist pedaling up a slope
2
Replies
73
Views
6K
Newton's law problem: Pushing 2 stacked blocks on a horizontal table
Replies
13
Views
3K
Work done by a force down a ramp
Replies
11
Views
2K
Period of simple pendulum on an inclined moving platform
Replies
20
Views
3K
Newton's 2nd Law: Why is Resistance Considered a Positive Force?
Replies
3
Views
2K
Find the acceleration of the system (2 blocks sliding on a table)
Replies
23
Views
2K
Coefficient of kinetic friction of a block sliding across the ceiling
Replies
7
Views
1K

Hot Threads

Recent Insights

Back
Top