Question

1. the image shows a speaker plugged into a socket.

what type of energy transformation is happening?
electrical to sound
radiant to electrical
chemical to thermal
mechanical to sound

1. destiny is riding her bicycle along a sidewalk. what is a type of energy transformation that occurs?

thermal to elastic
kinetic to thermal
elastic to chemical
chemical to kinetic

1. read each question thoroughly. the science coach boxes will help you apply the skills and concepts you need to answer the questions.

a soccer ball follows the path shown after it is kicked.
which statement best describes the energy of the soccer ball?
the kinetic energy is greatest at point a.
the kinetic energy is the least at point c.
the potential energy is double the kinetic energy at point b.
the potential energy is equal to the kinetic energy at point d.

Explanation:

1. A speaker plugged into a socket uses electrical energy to produce sound. So it is electrical to sound energy transformation.
2. When riding a bicycle, due to friction (between parts of the bicycle and between the bicycle and the ground), some of the kinetic energy (energy of motion of the bicycle) is converted into thermal energy (heat).
3. For the soccer - ball:

• At point A, if we assume the ball is just kicked, it has maximum kinetic energy (assuming no air - resistance and starting from ground level).
• At point C (the highest point), the vertical component of velocity is zero (in projectile motion, at the maximum height, vertical velocity \(v_y = 0\), and if we assume horizontal velocity is non - zero but less than the initial velocity at A in some cases, but generally, in a simple analysis of a kicked ball from ground level, kinetic energy is least at C as most of the kinetic energy is converted into potential energy at C.

Answer:

1. electrical to sound
2. kinetic to thermal
3. B. The kinetic energy is the least at Point C.