Question

assess it! part 1

1. an object at rest has equal forces acting on it. this can be described as a(n) ________ force.

a. gravity
b. unbalanced
c. balanced
d. physical

1. an object that is accelerating can be described as a(n) ________ force.

a. gravity
b. unbalanced
c. balanced
d. physical

1. which is the best example of an unbalanced force?

a. a book resting on a shelf
b. a train accelerating from the station
c. a chair sitting motionless
d. a car driving at a constant speed

Explanation:

1. When an object is at rest and has equal forces acting on it, the forces are balanced, canceling each other out.
2. An object that is accelerating has an unbalanced force acting on it according to Newton's second - law (F = ma, non - zero acceleration means non - zero net force).
3. A train accelerating from the station has an unbalanced force causing the change in its motion. A book on a shelf, a motionless chair, and a car at constant speed have balanced forces.

Answer:

1. C. balanced
2. B. unbalanced
3. B. A train accelerating from the station