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micahwood50
Group Title
A 2kg body rests on frictionless wedge that has an inclination of 60º and an acceleration a to the right such that the mass remains stationary relative to the wedge. Find a.
 2 years ago
 2 years ago
micahwood50 Group Title
A 2kg body rests on frictionless wedge that has an inclination of 60º and an acceleration a to the right such that the mass remains stationary relative to the wedge. Find a.
 2 years ago
 2 years ago

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micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
dw:1349586481376:dw
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
didn't we do this already?
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
No, we didn't.
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Still don't understand the force...
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
FBD: dw:1349586646724:dw Not sure if it's right, though.
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
dw:1349586759042:dw
 2 years ago

severus Group TitleBest ResponseYou've already chosen the best response.0
acos60=gcos30 (Balancing forces along the wedge in the reference frame of the wedge)
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
dw:1349587034552:dw
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
a= gtan60
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
How do you set the equation for y? Not sure if I'm doing it right...\[\Sigma F_y = Nsin60º = ma\]
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
Ncos60  mg =0
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Hold on, give me time.
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Why Ncos60, not sin?
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
look at the sketch
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
Nsin30  mg =0 (if you like)
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Yeah, silly me. Got it. Just give me a little more time.
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Can you explain me why Nsin60º = ma?
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
because there are only two forces acting on the mass... N and mg. if you think about it, it's magic otherwise... because if the block is being accelerated it can only be because the ramp is 'pushing' it... ie the Normal force...
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
if the block were somehow accelerated otherwise, it would be some magical force:)
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Now you're making it a little clear. If the wedge was given a greater cceleration, the block will slip upward, right?
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
acceleration*
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
it's like sitting in a car seat when someone stomps on the gas... you feel pushed back but the actuality is that the seat's Normal force has increased and is acting to accelerate you...
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Why not?
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
N would get longer, but it would still be perp. to the ramp face...
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
you're thinking maybe of a more "reallife" situation wherein air resistance is a factor... then yes, the block would slide up the ramp at some point...
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Now you're mention about air resistance, it does make block slide up. Thanks.
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
hmm actually, maybe you're right about that...
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
because mg is fixed so... if N stays perp. to the ramp face and ma gets longer...I guess N would have a y component larger than mg....
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
Hmm I see. It does make sense.
 2 years ago

Algebraic! Group TitleBest ResponseYou've already chosen the best response.2
I answered too quickly... sorry :P
 2 years ago

micahwood50 Group TitleBest ResponseYou've already chosen the best response.0
It's ok. You helped me a lot. Thanks. I wish I could give you more medals, lol.
 2 years ago
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