1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Anuta_ua [19.1K]
3 years ago
10

A skateboarder is skating back and forth on the halfpipe as seen below. As he skates his energy transforms from potential energy

to kinetic energy and back again. According to the law of conservation of energy he should keep moving forever, but eventually he comes to a stop. Why does he eventually stop moving? Question 8 options: Friction and air resistance cause some of his kinetic energy to be “lost”. This makes him slow down. The law of conservation of energy does not apply to this situation. One side of the ramp is shorter than the other so he slows down. The mass of the skateboarder causes him to have less kinetic energy than potential energy so he slows down. Save
Physics
1 answer:
egoroff_w [7]3 years ago
7 0

Answer:

Friction and air resistance cause some of his kinetic energy to be “lost”. This makes him slow down.

Explanation:

The law of conservation of energy states that in absence of frictional forces, the mechanical energy of an object (given by the sum of its kinetic and potential energy) is conserved. In such a situation, the skateboarder would never stop his motion, because potential energy is continuously converted into kinetic energy and vice-versa, but the total energy remains the same so he would never stop.

In a real world, however, this is not true. In fact, in a real world some frictional force are present, in particular:

- friction: this force is due to the contact between the skateboard and the surface of the halfpipe, and its direction is always opposite to the motion of the skateboarder

- Air resistance: this force is due to the resistance opposed by the molecules of air that the skateboarder meets during his motion, and its direction is also opposite to the motion of the skateboarder

This two forces are said to be non-conservative forces, which means that they cause some of the mechanical energy of the skateboarder to be "lost", in the sense that it is dissipated as heat and it is no longer available for the skateboarder.

Therefore, the correct option is

Friction and air resistance cause some of his kinetic energy to be “lost”. This makes him slow down.

You might be interested in
Releases hydrogen ions in water is that acid or bases?
wolverine [178]
Acid it is i believe........
6 0
2 years ago
Which image illustrates why dark clothing helps to keep you warm on a cool, sunny day?
xeze [42]

Answer:

Explanation:

I suppose it has to do with the way the diagram is drawn. The heat does not reflect which makes both A and B incorrect.

C would have nothing to do with either reflection or refraction.

That only leaves D which is the answer.

7 0
3 years ago
Read 2 more answers
true or false? short-wave heat radiation is given off by the earth when the earth absorbs long-wave radiation.
Greeley [361]

Answer:

Hope this helps u, pls mark me brainlist

Explanation:

The sun emits shortwave radiation because it is extremely hot and has a lot of energy to give off. Once in the Earth's atmosphere, clouds and the surface absorb the solar energy. The ground heats up and re-emits energy as longwave radiation in the form of infrared rays.

4 0
2 years ago
Help plssssssssssss
grin007 [14]
C. A little backward, 100 or 110 degrees
6 0
3 years ago
How do I solve Q.14 & Q.15
timurjin [86]
14-needle heading west
15-the strength of the current and the distance
6 0
2 years ago
Other questions:
  • emperature is most closely related to which property of a liquid? (1 point) Select one: a. the volume of the liquid b. the numbe
    15·1 answer
  • A child in a tree house uses a rope attached to a basket to lift a 24 N dog upward through a distance of 4.9 m into the house.
    7·1 answer
  • A pitcher throws a 0.144-kg baseball toward the batter so that it crosses home plate horizontally and has a speed of 42 m/s just
    8·1 answer
  • A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of v0 = 15.0 m/s. The cliff i
    12·1 answer
  • A crow drops .11 -kg clam onto a rocky beach from a height of 9.8 m. What is the kinetic energy of the clam when it is 5.0 m abo
    9·1 answer
  • What is the answer for this please
    14·1 answer
  • What can you conclude about the velocity of the object on the graph below
    6·1 answer
  • Transforma las siguientes unidades utilizando factores de conversión (no vale poner el número solo) a. 85 atm a mmHg b. 60 Pa a
    13·1 answer
  • a low tide and a high tide occur in the oceans two times each day. which factor has the greatest effect on the size of the tides
    11·1 answer
  • Energy that is transferred from a warmer object to a cooler object is called
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!