Track II · five questions

Quiz · Forces

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

1. 1 of 5

   The SI unit of force is defined from

   weight of 1 kgF = ma, with 1 N = 1 kg·m/s²atmospheric pressurea spring standard

2. 2 of 5

   A free-body diagram should include

   forces the body exerts on othersthe acceleration vector as a forceforces acting on that body onlyvelocity

3. 3 of 5

   Angle of repose θc satisfies

   sin θc = μstan θc = μscos θc = μsθc = μs

4. 4 of 5

   Static friction on a stationary crate you are gently pushing is

   always μs Nalways zeroequal to the push, up to μs Nequal to kinetic friction

5. 5 of 5

   Action–reaction pairs always

   act on the same bodyact on different bodiescancel on a free-body diagramdo equal work