56 in) long has its fulcrum 10 cm (3.94 in) from one end. rt sure the best possi

Question

56 in) long has its fulcrum 10 cm (3.94 in) from one end. rt sure the best possibility of arriving at lo 7. A lever 70 cm (27.56 36 kg (79.2 lb) is placed on the ng has its fulcrum 10 cm (3.94 in) from one end. A mass of dvwshort end of the lever acting 10 cm (3.94 in) from the ould you place at the other end of the lever to keep it in equilibrium? o A horizontal bar 3 meters (9.84 ft) in length has its fulcrum 1 m (3.28 ft) from one end. A force of 100 N (22.43 lb) is applied at the short end of the bar while a force of 40 N (8.97 lb) is applied at the long end. What additional force must be applied to the long end to return the forces to equilibrium? 8.

Explanation / Answer

Q7.

let mass to be kept is m kg.

then balancing the torque about the fulcrum:

(36 kg)*g*(10 cm)=(m kg)*g*((70-10) cm)

==>m=36*10/60=6 kg

Q8.

let additional force to be applied be F.

then balancing torque:

100*1=(40+F)*(3-1)

==>40+F=50

==>F=10 N

so additional force of 10N to be applied.

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