Question

multiple choice
which of the following best describes acceleration?
select all that apply.
a it is the difference between the two opposing forces acting on an
object.

b it occurs when an unbalanced force acting on an object causes the ob-
ject to either lose speed, gain speed, or change direction.

c it can be described as a change in velocity.

d it is defined as speed in a particular direction.

Explanation:

• Option A: The difference between two opposing forces is net force, not acceleration. So A is incorrect.
• Option B: According to Newton's second law, an unbalanced force causes acceleration, which can result in a change in speed (gain/lose) or direction. So B is correct.
• Option C: Acceleration is defined as the rate of change of velocity ($a = \frac{\Delta v}{\Delta t}$), so a change in velocity (either magnitude or direction) means acceleration. So C is correct.
• Option D: Speed in a particular direction is velocity, not acceleration. So D is incorrect.

Answer:

B. It occurs when an unbalanced force acting on an object causes the object to either lose speed, gain speed, or change direction.
C. It can be described as a change in velocity.