1)The mass of 5 kg is attatched at a point 3 m to the right of the fulcrum of a
ID: 1546718 • Letter: 1
Question
1)The mass of 5 kg is attatched at a point 3 m to the right of the fulcrum of a horizont lever arm, as shown above. At what point must a mass of 3kg be attatched to balance?
a. -2m
b. -4m
c. -5m
d. -3m
2)Conceptually, what is really being balanced in this problem to prevent rotation?
a. moments of inertia
b. moment arms
c. forces
d. torques
3)which statement captures all the principles of physics demonstrated best here?
a. balancing torques prevents rotation, while balancing forces prevents translation.
b. balancing forces keeps the system in balance.
c. the fulcrum holds things up
d. mass must be spread out equally to balance things.
4)Compute the total upward force provided by fulcrum?
a. 49N
b. 29.4N
c. 78.4N
d. 0N
Explanation / Answer
balancing moment arms
5 (3) = 3 (r)
R = - 5
correct option isc
Q.2 b. moment arms
Q.3 a. balancing torques prevents rotation, while balancing forces prevents translation.
Q.4 upward force = ( 5+3) 9.8 = 78.4 N
correct option is c
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