Question

When an object accelerates, what about its motion changes? Question 1 options: Speed must change, but not velocity. Both speed and velocity must change. Velocity must change, but not speed. Neither speed or velocity can change

Answer 1

Answer:

The velocity must change but not speed.

Explanation:

• Velocity is defined as the displacement by time. Whereas speed is expressed as the distance between two successive positions of the body to the time interval it took to travel.

                Velocity,        V = D / t        m/s

                 Speed,          s = d /t          m/s          

• Velocity is a vector quantity that has a magnitude and direction.
• The speed is a scalar quantity having only the magnitude.
• At any instant of time, the magnitude of the velocity is always equal to the magnitude of the speed. The magnitude of velocity, |v | = magnitude of speed, |v |. The magnitude is always positive
• The acceleration of a body is defined as the rate of change of velocity to time.

                                  a = (v - u) / t      m/s²

• If a body is accelerating, It varies its velocity with respect to time.
• In case of uniform circular motion, the speed remains constant, but the velocity changes continuously.

So, in the case of circular motion if an object accelerates, velocity must change but speed remains constant.