CH 4: EQUILIBRIUM OF A RIGID BODY

Below are the example of rigid body except:

• Beam

• Slab

• Cement

• Column

Identify types of forces explained in that diagram?

• Coplanar force

• Concurrent force

Which diagram describe concurrent force?

• 
• 

If a system is in static equilibrium, it must have the following 2 conditions:

• ∑M=0

• Constant acceleration

• ∑F=0

• Positive forces only

The formula used to find moment at A is...

• (m)(g)

• (F) cos(Ɵ)

• (F)(d1)

• (m)(a)

Giving the following image, the force is...

• counter clockwise (positive)

• clockwise (negative)

Giving the following image, there are _____ forces acting on the sytem.

• 3 forces (weight 1, weight 2, and distance 2)

• 2 forces(weight 1 and weight 2)

• 1 force (weight 1)

• 1 force ( weight 2)

If the x component and y component of a vector are 34 N and 20 N respectively, the magnitude of the vector will be...

• 54N

• 1000 N

• 39.44 N

• 1556 N

The moment of a 50 N force 20 cm away from the pivot point will be...

• 500 N

• 20 Nm

• 10 Nm

• 15 Nm

If the kid on the left weights 490 N, 0.5m away from the pivont point, then the second kid must have____________ in order to keep it in static equilibrium

• 340 N, 0.1 m away from the pivont point to the right

• 220 N, 0.2 m away from the pivont point to the left

• 490 N, 0.5m away from the pivont point to the right