MCQs: Balanced beams

1. The diagram shows a balanced beam.

The mass m is

1 x 20 = 30 x m
m = 2/3

 

2. Calculate the force F fo the balanced beam below.

10 x 3 = 4 x F

F = 30/4 N

 

3. Calculate the force F fo the balanced beam below.

10 x 2 = 2 x 2 + 4F

4F = 20 - 4 = 16

 

4. Calculate the force F fo the balanced beam below.

.

10 x 4 = 2 x 2 + 4F

4F = 36 N

 

5. Calculate the force F fo the balanced beam below.

10 x 4 = 2 x 2 + 2F

F = 36/2 N

6. On which marker must a 20 N downward force be applied in order to balance the beam below.

 

10 x 4 = 20 x L

L = 2 cm to the right of the pivot

7. Calculate the mass of the balanced beam below.

Weight acts at the centre (5cm mark)

10 x 2 = W x 2
W = 10 N = mg

8. If the mass of the balanced beam below is 1 kg what is the magnitude of force F?

6F + 3 x 10 = 20 x 2

6F = 10 N

9. If the weight of the balanced beam below is 10 N calculate the force exerted by support A.

Taking moments about B

4F = 10 x 3

F = 30/4 N

 

10. A 2 kg mass sits on the 1kg beam shown below. Calculate the force exerted by support B.

Taking Torques about A
20 x 2 + 10 x 3 = 6F
F = 70/6 N

Total Score:

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