Levers and Torque

An athlete is holding a 10 kg dumbbell.

Calculate the resistance FORCE of the 10kg dumbbell.

• 98.1 N

• 981 N

• 1.02 N

Using the FORCE from the dumbbell, calculate the TORQUE from the dumbbell in Nm.

The length of the moment arm at 90 degrees elbow flexion is 35 cm.

• 280 Nm

• 34.3 Nm

• 3433.5 Nm

Using the FORCE from the dumbbell, calculate the TORQUE from the dumbbell in Nm.

The length of the moment arm in full elbow flexion is 12 cm.

• 817.5 Nm

• 11.8 Nm

• 117.7 Nm

The mass of an object remains the same. Its force due to gravity remains the same (no change in mass). One moment arm is LONG. The other moment arm is SHORT. Which moment arm has the largest TORQUE?

• LONG moment arm

• SHORT moment arm

• Still not sure

Calculate the BICEPS FORCE at 90 degrees elbow flexion using the previously calculated TORQUE from the dumbbell and the moment arm of 4 cm.

• 858.4 N

• 1.37 N

• 3.92 N