Inertia — Prelims Questions

A passenger standing in a bus tends to fall backward when the bus suddenly starts. This phenomenon is an example of:

Which of the following statements about inertia is INCORRECT?

A heavy truck and a light car are both moving at the same speed. Which vehicle has greater inertia of motion, and why?

When a grinding wheel is rotating rapidly, sparks fly off tangentially. This phenomenon is best explained by:

A person running a long jump takes a long run-up before jumping. This is primarily to:

Two spheres, A and B, have masses $m_A = 5,\text{kg}$ and $m_B = 10,\text{kg}$ respectively. If both spheres are at rest, which statement correctly compares their inertia?