# mechanics questions

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#1
which statement does not apply to mechanical equilibrium?

1. the velocity of an object is zero or constant
2. the velocity of an object is zero
3. the sum of the moments of the forces acting on it is zero

For projectiles:
is vertical and horizontal acceleration constant or not
is the vertical and horizontal velocity constant or not
0
3 years ago
#2
Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

Just quoting in Danny Dorito so she can move the thread if needed
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(Original post by Danny Dorito)
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0
3 years ago
#3
Hey!

For the first bit I'm pretty sure it's number 1 using Newtons first law of an object in equilibrium as if the object is in equilibrium then it won't be moving.

The second one is harder, I know that horizontal acceleration is always 0 - therefore the velocity is always the same.The vertical acceleration is always 9.8 (gravity) and remains at that, so is constant. However I don't think vertical velocity is constant seeing as it is accelerating, and the velocity is 0 when you reach the highest point (or midpoint) which means the velocity has to change.

I hope that helps a bit! I'm studying mechanics this year and it's not my strong suit!
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