Say what energy changes are taking place:

a)clockwork toy
b)boy kicking soccer ball
c)boiling kettle on a gas ring
d)person walking upstairs
What are the wasted energy in a) b) c) and
d)?

What is your thinking on this?

A) heat energy

B) same as a c$ d also heat energy

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a is strain energy and kinetic energy

To understand the energy changes taking place in each scenario, we need to consider the different forms of energy involved.

a) Clockwork toy: The energy change in a clockwork toy involves the conversion of potential energy stored in the wound-up spring into kinetic energy as the toy unwinds and moves. As the spring unwinds, the potential energy decreases, and the kinetic energy increases.

b) Boy kicking soccer ball: When a boy kicks a soccer ball, the energy change involves the conversion of the boy's muscular energy (chemical energy from food) into kinetic energy as he kicks the ball. The potential energy stored in the boy's leg muscles is transformed into the kinetic energy of the moving ball.

c) Boiling kettle on a gas ring: In this scenario, the energy change occurs as a result of converting chemical energy from burning gas into thermal energy. The gas ignition provides heat, which is transferred to the water in the kettle. The chemical energy from the gas is transformed into thermal energy as the water temperature increases.

d) Person walking upstairs: When a person walks upstairs, the energy change involves converting chemical energy from food into kinetic energy of movement. The potential energy stored in the person's muscles is transformed into both kinetic energy to move the body upwards and gravitational potential energy as the person gains height.

Now, let's identify the wasted energy in each scenario:

a) Clockwork toy: In an ideal scenario, without any friction, the only energy transformation would be from potential energy to kinetic energy. However, due to friction between the toy's mechanism, there is wasted energy in the form of heat due to frictional forces.

b) Boy kicking soccer ball: Similar to the clockwork toy, there is also wasted energy due to friction between the boy's foot and the ground. This wasted energy results in heat dissipation during the kicking motion.

c) Boiling kettle on a gas ring: Wasted energy in this scenario includes heat lost to the surrounding environment. Some of the thermal energy generated by burning gas will escape into the air, which reduces the efficiency of the process.

d) Person walking upstairs: The wasted energy here is primarily due to friction between the person's feet and the surface of the stairs. As the person walks, some of the energy is dissipated as heat due to friction, decreasing the overall efficiency of the process.

In summary, the wasted energy in a) the clockwork toy, b) the boy kicking soccer ball, c) the boiling kettle on a gas ring, and d) a person walking upstairs, come from sources such as friction, heat dissipation, and inefficient energy transfer.