Constant Speed

[zanetsu]

Hey guys,

I have to talk for 2 minetus about a runner holding constant speed. Can you guys help me with what say, and i was thinking about makeing a free body diagram, but can someone give me instructions about what forces i should put on there? I could really use help with this, thanks in advance for all help. any terms/ ideas on this is very welcome.

[timo]

Dunno what a "free body diagram" is but three potentially interesting properties to look at are:

- The position ("how far did he get already?") at a certain time t.

- The velocity (=pretty much the same as speed) at a certain time t.

- The acceleration (=pretty much the same as the force, for your case) at a certain time t.

Once you know how these three properties behave, you should get some ideas what to talk about (ideally things that weren´t obvious to you bevore you investigated them).

[zanetsu]

A free bpdy diagram is where the object is represented by a box, and the forces oppsed on the object are represented by lenth of arrows. (in simple)

It is probaly known to you as a differant name.

 

Also, i think i need to go into more advanced with terms. Distance, velocty are going to be talked about, but i cant talk about it for that long, or i wont get a great grade, and i need one cause i will have A if i get a 95+ on it lol.

[psynapse]

Fg and Fn equal and opposite, Ff and Fa also equal and opposite. I will leave the rest up to you.

[psynapse]

sorry for the double post but for position and velocity and such you should proabably plot a x/t graph (position vs time) from that you can get velocity.

[zanetsu]

ok, i will make the graph, and i just made a free body diagram, well a very simple one, but it will definitly do. But i still need some advanced pyhsics terms/laws to apply for running at constant speed. Thanks again for all help, and upcomeing help.