Question

Which example identifies a change in motion that produces acceleration? choices are: 1. a speed skater moving at a constant speed on a straight track 2. a ball moving at a constant speed around a circular track 3. a particle moving in a vacuum at constant velocity 4. a vehicle moving down the street at a steady speed user: how did the great depression eventually change germany politically? choices are: 1. germans eventually believed that democracy would solve their economic problems. 2. ...

Answer 1

Acceleration is a vector quantity that takes into account the changes in either the direction or the velocity or both. From the choices given, I go with choice number 2 where the body moves in a circular motion; thus, causing changes in its direction from time to time.

Answer 2

Option (2) is correct. The motion of a ball in a circular path at a constant speed is a motion that produces acceleration.

Explanation:

The acceleration of a body is defined as the rate of change of velocity of the body in motion. If the velocity of the body is changing, the body is considered to be moving under acceleration.

The speed skater moving on a straight track at a constant speed is not considered to be moving under acceleration because the speed of the skater remains same and the direction also remains constant.

If a body moves at a constant speed but the direction of motion of the body changes continuously during its motion, then the velocity of the body changes and due to this, the body is considered to be moving under acceleration.

Therefore, the motion of a ball in a circular path is considered to be under acceleration as the direction of the ball keeps changing during the motion.

A vehicle moving down the street at a constant speed and a particle in vacuum is also not considered as acceleration because the speed of the vehicle and particle remains constant.

Thus, option (2) is correct. The motion of a ball in a circular path at a constant speed is a motion that produces acceleration.

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

acceleration, change in velocity, speed, direction, constant, steady, circular path, motion, ball moving, object, straight, skater.