Help with drawing free-body diagrams?

[NickR]

Homework Statement

Bobo decides to go skydiving. When he jumps from the plane, his mass combines with the mass of his chute is 75.4kg, which means that the force of gravity on him is 739N.
A. Before he opens the chute, the wind resistance on Bobo gives him an upward force of 10N. Draw a force diagram that represents Bobo as he begins to dive.
B.After he opens his chute, the force of the wind exactly balances the Fg on him. Draw a force diagram that represents this part of Bobos dive.

Homework Equations

None?

The Attempt at a Solution

A. I drew it with 10N of force going upward.

B. I drew it with 10N of force going upward and downward.

I feel like this is wrong..


Also, how does friction affect a freebody diagram? How much it pushes against the table? I don't get it...

 

[PhanthomJay]

Homework Statement

Bobo decides to go skydiving. When he jumps from the plane, his mass combines with the mass of his chute is 75.4kg, which means that the force of gravity on him is 739N.
A. Before he opens the chute, the wind resistance on Bobo gives him an upward force of 10N. Draw a force diagram that represents Bobo as he begins to dive.
B.After he opens his chute, the force of the wind exactly balances the Fg on him. Draw a force diagram that represents this part of Bobos dive.

Homework Equations

None?

The Attempt at a Solution

Hi, Nick, welcome to these forums!

A. I drew it with 10N of force going upward.

That's the wind resistance force...what other force acts downward on him?

B. I drew it with 10N of force going upward and downward.

I feel like this is wrong..

yes it is wrong. The wind resistance force has the same magnitude as the other force acting on him. What is the other force? (Hint, the problem designates it as Fg).

Also, how does friction affect a freebody diagram? How much it pushes against the table? I don't get it...

If you push an object horizontally along a level table by applying a horizontal force of say 5N, and say it does not move, what force prevents it from moving, and what is the direction of that force, and how much is that force?

 

[NickR]

Hi, Nick, welcome to these forums!That's the wind resistance force...what other force acts downward on him? yes it is wrong. The wind resistance force has the same magnitude as the other force acting on him. What is the other force? (Hint, the problem designates it as Fg). If you push an object horizontally along a level table by applying a horizontal force of say 5N, and say it does not move, what force prevents it from moving, and what is the direction of that force, and how much is that force?

Gravity?

Friction impedes the motion, if the friction is less than the force you are applying, it will accelerate, if more than it will stand still, and if same it will either stay still or move at a constant velocity, because of Newtons First Law, correct?