Why does a girl skateboarding on a half-pipe not remain in motion forever?
a
none of the above
b
her energy is transformed into thermal energy from friction
c
her energy is destroyed by the friction of the skateboard and the concrete
d
her energy is used up
The correct answer is (b) her energy is transformed into thermal energy from friction. As the girl skateboards on the half-pipe, there is friction between the skateboard and the surface of the half-pipe, which converts some of her kinetic energy into thermal energy. This loss of energy slows her down, eventually bringing her to a stop.
Well, let me clown around with this one. It's not like she's just got too much coolness to handle and decides to stop all of a sudden. The correct answer is b, her energy is transformed into thermal energy from friction. Just like how we transform jokes into laughter! It's all about that conversion, baby.
The correct answer is b) her energy is transformed into thermal energy from friction.
When a girl skateboarding on a half-pipe applies force to propel herself forward, she gains kinetic energy. However, as she moves, she encounters friction between the skateboard's wheels and the surface of the half-pipe. This friction converts some of her kinetic energy into thermal energy, causing her to gradually slow down.
Friction is a force that opposes motion and is present in almost all real-world situations. In this case, it acts to dissipate the skater's energy as heat. Without an external force or continual input of energy, the girl will eventually come to a stop due to the loss of kinetic energy.
The correct answer is b) her energy is transformed into thermal energy from friction.
When a girl is skateboarding on a half-pipe, there are several forces acting upon her. First, there is the gravitational force pulling her downwards. As she moves down the half-pipe, her potential energy is converted into kinetic energy, which is the energy of motion. However, due to the presence of friction and air resistance forces, some of her kinetic energy is gradually transformed into other forms of energy.
Friction is the force that opposes the motion of objects in contact with each other. In this case, the friction between the skateboard and the concrete surface of the half-pipe generates heat. This conversion of kinetic energy into thermal energy is an example of the law of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another.
Therefore, as the girl skateboarder moves along the half-pipe, her kinetic energy is being continuously reduced due to the conversion into thermal energy. Eventually, if no external force is applied, her energy will be dissipated entirely, causing her motion to come to a stop. Consequently, the girl does not remain in motion forever due to the conversion of her kinetic energy into thermal energy through friction.