Can someone explain 31 please. Thanks
physics
- Thread starter moneyking
- Start date
Can someone explain 31 please. Thanks
- Joined
- Jul 30, 2014
- Messages
- 76
- Reaction score
- 32
Since the board is in static equilibrium, there is no rotation around the point where the rope is attached. So the rotation caused by the mass (counter-clockwise) is equal magnitude and in opposite direction of the rotation caused by the weight of the board (clockwise). The weight of the board can be treated like a point for at the center of mass, 0.5 meters in, similar to this picture:
So 0=(moment of board) - (moment of mass)
0= Fboard*(distance to T) - Fmass*(distance to T)
0=(m*10)*0.3 - 3*10*0.2
Solve for m, m=2 kg
So 0=(moment of board) - (moment of mass)
0= Fboard*(distance to T) - Fmass*(distance to T)
0=(m*10)*0.3 - 3*10*0.2
Solve for m, m=2 kg
- Joined
- Jul 30, 2014
- Messages
- 76
- Reaction score
- 32
Sure, so if you have an object like this:
Gravity acts on all masses, so at every little point along the bar, gravity is acting, shown by all of the little force arrows. To simplify this for calculations, we can represent all of these little forces as one big force at an object's center of gravity.
Like this:
Gravity acts on all masses, so at every little point along the bar, gravity is acting, shown by all of the little force arrows. To simplify this for calculations, we can represent all of these little forces as one big force at an object's center of gravity.
Like this:
