Track IV · five questions

Quiz · Momentum & rotation

Closed notes, open head. 80% marks the track complete. Best so far: 0%.

1. 1 of 5

   Crumple zones reduce peak force by

   reducing Δpincreasing Δt for the same Δpincreasing masseliminating impulse

2. 2 of 5

   A perfectly inelastic collision conserves

   kinetic energy onlymomentum only (if isolated)both KE and pneither

3. 3 of 5

   Torque is maximised, for a given F and r, when the angle between r and F is

   0°45°90°180°

4. 4 of 5

   You may compute Στ about

   the center of mass onlya pivot onlyany pointinfinity only

5. 5 of 5

   A hoop and a disk, equal M and R, same axis through center. Larger I belongs to the

   diskhoopthey tiewhichever spins faster