Short moments starter

State the principle of moments.

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If A has a weight of 0.40N, what is the weight of object B (Newtons):

Weight of object C in Newtons (D has a weight of 0.1N)

B ii) Calculate the distance d (in m - don't write unit)

b iii) Calculate the magnitude of T (in N)

Object A becomes detached and falls. State the initial effect on the rod holding objects A and B

• Turns clockwise

• turns anticlockwise

• stays level

• falls down

• accelerates right

Object A becomes detached and falls. State the initial effect on the rod holding objects C and D

• Turns clockwise

• turns anticlockwise

• stays level

• falls down

• accelerates up

Object A becomes detached and falls. State the initial effect on the rod closest to the top

• Turns clockwise

• turns anticlockwise

• stays level

• falls down

• accelerates up

What's the best explanation for these motions?

• Resultant forces have become nonzero

• moments becoming unbalanced

• Newton's third law on object A acting on the rod

• the weight of the rod itself causing the acceleration