Question 19N.3.SL.TZ0.c(i)
| Date | November 2019 | Marks available | [Maximum mark: 2] | Reference code | 19N.3.SL.TZ0.c(i) |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Distinguish | Question number | c(i) | Adapted from | N/A |
A flywheel is made of a solid disk with a mass M of 5.00 kg mounted on a small radial axle. The mass of the axle is negligible. The radius R of the disk is 6.00 cm and the radius r of the axle is 1.20 cm.
A string of negligible thickness is wound around the axle. The string is pulled by an electric motor that exerts a vertical tension force T on the flywheel. The diagram shows the forces acting on the flywheel. W is the weight and N is the normal reaction force from the support of the flywheel.
The moment of inertia of the flywheel about the axis is .
At t = 5.00 s the string becomes fully unwound and it disconnects from the flywheel. The flywheel remains spinning around the axle.
The flywheel is in translational equilibrium. Distinguish between translational equilibrium and rotational equilibrium.
[2]
translational equilibrium is when the sum of all the forces on a body is zero ✔
rotational equilibrium is when the sum of all the torques on a body is zero ✔
