Lever. Lever: operation and uses

question 1

(Uece) A seesaw in a children's playground is occupied by two identical twins of the same mass, Cosmo and Damião. In play, while one of the brothers climbs on one of the toy seats, the other goes down on the other seat. The toy can be described as a rigid rod, with an accent at each end, and free to rotate in a vertical plane around the center point. Consider the torques on the seesaw shaft exerted by Cosmo's weight forces (τ_ç) and Damião (τ_d), in relation to the central point. In the configuration where Cosmo is in the highest position, it is correct to say that

The) |τ_ç| < |τ_d|.

B) |τ_ç| = |τ_d|.

ç) |τ_ç| > |τ_d|.

d) |τ_ç| > –|τ_d|.

question 2

(Udesc) When closing a door, a force is applied to the handle to make it rotate around a fixed axis where the hinges are. Regarding the movement of this door, analyze the propositions.

I. The greater the perpendicular distance between the handle and the hinges, the less effective the force torque.

II. The unit of force torque in Sl is N.m, and it can also be measured in Joule (J).

III. The force torque depends on the perpendicular distance between the handle and the hinges.

IV. Whatever the direction of the force, its torque will be non-zero, consequently, the door will always rotate.

Check the correct alternative.

a) Only statement II is true.

b) Only statements I and II are true.

c) Only statement IV is true.

d) Only statement III is true.

e) Only statements II and III are true.

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