Which is not expecting acceleration?

A point on the outside of a spinning top whose rotational speed is constant.
A skydiver whose air resistance is equal to that of her weight.
A car on the freeway experiencing a net force of -120 N.
A submerged beach ball whose buoyant force is eight times the force of gravity on it.

Which is not considered to be a contact force?
Gravity(my choice)
Spring
Normal
Tension

Which is the definition of inertia?
The tendency an object has to accelerate.
A quanitive measurement of mass.
The tendency of an object’s motion to remain the same(my choice)
A qualitive measurement of mass.

1 answer

A skydiver whose air resistance is equal to that of her weight.
gravity
tendency of motion to remain constant