Question

An object has a non-zero acceleration so long as which quantity is changing?

Group of answer choices

A. velocity

B. position

C. mass

D. rotation rate

Answer 1

If a particle has a non zero acceleration then it implies that it acceleration has a magnitude and it could be negetive or positive.

• Negetive acceleration defines that velocity is decreasing with time
• Positive acceleration defines that velocity is increasing with time

To understand the positive and negative acceleration more effectively we can take a example.

e.g,

• a car start from rest and moving with a velocity 60km/hr . here the cars velocity velocityincrease with time so it's a positive acceleration.
• Now after applying a break the car goes to rest from a velocity of 60km/hr. Here the car velocity decrease with time so it's a negetive acceleration.

Now concentrate on the equation, it says a particle has a non zero acceleration so

1. It's velocity should be changed because the object has a negetive or positive acceleration and the velocity should increase or decrease with time.
2. Now it's Position may or may not be changed because if the object goes in a straight line then it's position may be changed but if the object is moving along a circular path then it's position may not be able to change because it's comes to the same position after some time.
3. The mass of the object should not be changed because in classical world acceleration or velocity is independent of mass.however in quantum world is would be different.(but we should consider the classic theory here)
4. Rotation rate should not be changed because to create a rotational motion we need a torque[it's a equal and opposite force which lead to a rotational motion].as here we consider the object is moving with linear acceleration hence the rotation rate should not be changed.(but if the acceleration is tangential acceleration then it shows arotational motion and rotation rate should be changed)