You are Here: Home

Forces watch

1. There is a free body force diagram of a glider. It says "name each of the four forces shown and identify in each case what exerts the force". For the glider's weight, what exerts the force? It is just the Earth that exerts it? This sounds wrong, but so does "the glider exerts the force on the glider".

Thanks,
mike
2. Glider exerts weight on the ground.
Ground exerts a normal reaction on glider.
Pull is the forward force. (or driving force)
Friction is the backward force, caused by the rough ground if it is.
3. The glider is flying
4. (Original post by mik1a)
The glider is flying
lol u didnt say that did u? btw i jus rushed it anyway i had to go to poo.

no ground then... upthrust + viscous drag for upward force...
weight of glider downwards...

Air resistance for backward force?

btw did u mean constant velocity or theres acceleration? or else theres no pulling force.
5. (Original post by mik1a)
The glider is flying
Down: gravitational pull of earth on glider
Up: gravitatioanl pull of glider on earth ???
Forward: not sure
Backward: Air resistance

?????
6. So I can say the Earth exerts the force of weight on the glider?
7. (Original post by z!D4N)
lol u didnt say that did u? btw i jus rushed it anyway i had to go to poo.

no ground then... upthrust + viscous drag for upward force...
weight of glider downwards...

Air resistance for backward force?

btw did u mean constant velocity or theres acceleration? or else theres no pulling force.
It doesn't matter to the question, but no there is no resultant force. I only asked what exerts the force that is weight on the glider.
8. (Original post by mik1a)
So I can say the Earth exerts the force of weight on the glider?
yars
9. (Original post by mik1a)
I only asked what exerts the force that is weight on the glider.
the earth (i think)
10. (Original post by z!D4N)
lol u didnt say that did u? btw i jus rushed it anyway i had to go to poo.

no ground then... upthrust + viscous drag for upward force...
weight of glider downwards...

Air resistance for backward force?

btw did u mean constant velocity or theres acceleration? or else theres no pulling force.
u said sth name 4 of the forces... so i did them anyway... jus in case XDDD~~
11. (Original post by z!D4N)
u said sth name 4 of the forces... so i did them anyway... jus in case XDDD~~
Lol ok thankyou both of you. It's a non-contact force, sort of hard to imagine the Earth exerting the force itself, but never mind.
12. (Original post by mik1a)
Lol ok thankyou both of you. It's a non-contact force, sort of hard to imagine the Earth exerting the force itself, but never mind.
wt on earth is non-contact force?
13. (Original post by z!D4N)
wt on earth is non-contact force?
not physically touching? e.g. glider and earth (ground) are not touching
14. 'Scuse me, but doesn't gravity exert that force?
15. (Original post by mockel)
not physically touching? e.g. glider and earth (ground) are not touching
Yeah that's it, although technically no forces are contact forces, ie. air resistance is transmitted through a field of the electrons in the air and electrons on the plane repelling, they don't actually touch either I guess.

But yeah that's what it says in my physics notes.. gravity is a non contact force.
16. weight of the glider on the earth
weight of earth on glider
lift from wing
drag from air resistances
17. (Original post by generalebriety)
'Scuse me, but doesn't gravity exert that force?
what force?
18. Weight. The earth is a lump of physical matter. It doesn't exert any forces.
19. (Original post by generalebriety)
'Scuse me, but doesn't gravity exert that force?
gravity isnt a force, its a description of a field
20. (Original post by generalebriety)
Weight. The earth is a lump of physical matter. It doesn't exert any forces.
yes is does, do you do gcse physics?

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 30, 2004
Today on TSR

Congratulations to Harry and Meghan!

But did you bother to watch?

Why are girls so attracted to tall guys?

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE