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Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
What does a horizontal line represent on a position vs time graph?
If time is along the horizontal axis, and speed up the vertical, then a horizontal line indicates that at all times the speed remains at a fixed value. Hence the object is travelling at a constant speed of v, where v is the height of the horizontal line.
Can kinetic energy be changed back to potential energy?
History
A roller coaster train going down hill represents merely a complex case as a body is descending an inclined plane. Newton's first two laws relate force and acceleration, which are key concepts in roller coaster physics. At amusement parks, Newton's laws can be applied to every ride. These rides range from 'The Swings' to The 'Hammer'. Newton was also one of the developers of calculus which is essential to analyzing falling bodies constrained on more complex paths than inclined planes. A roller coaster rider is in an gravitational field except with the Principle of Equivalence.
Potential Energy
Potential energy is the same as stored energy. The "stored" energy is held within the gravitational field. When you lift a heavy object you exert energy which later will become kinetic energy when the object is dropped. A lift motor from a roller coaster exerts potential energy when lifting the train to the top of the hill. The higher the train is lifted by the motor the more potential energy is produced; thus, forming a greater amount if kinetic energy when the train is dropped. At the top of the hills the train has a huge amount of potential energy, but it has very little kinetic energy.
Kinetic Energy
The word "kinetic" is derived from the Greek word meaning to move, and the word "energy" is the ability to move. Thus, "kinetic energy" is the energy of motion --it's ability to do work. The faster the body moves the more kinetic energy is produced. The greater the mass and speed of an object the more kinetic energy there will be. As the train accelerates down the hill the potential energy is converted into kinetic energy. There is very little potential energy at the bottom of the hill, but there is a great amount of kinetic energy.
Theory
When the train is at the top and bottom of the hill there is not any potential or kinetic energy being used at all. The train at the bottom of the first drop should have enough energy to get back up the height of the lift hill. The "Act of Faith" in riding these amazing rides which seems more of a phenomena that is only a theory. In practices, the train never could make it back up the hill because of dissipative forces. Friction and air resistance, and even possible mid-course breaks, are dissipative forces causing the theory to be changed but not destroyed. These forces make it impossible for the train to have enough energy to make it back up the lift hill's height. In the absence of the dissipative forces the potential and kinetic energies(mechanical energy) will remain the same. Since the mechanical energy is destroyed by the forces, the first hill is always the highest
What is final velocity minus initial velocity divided by time used for?
That expression represents average speed during the time.
What is the possible miles per hour of a kicked soccer ball?
If you kick a soccerball hard enough it would go 100 mph.
Does a golf ball on the grass have a potential energy?
Yes, a golf ball on the grass has potential energy due to its position in the Earth's gravitational field. When the ball is raised to a certain height, it gains potential energy which can be converted into kinetic energy when it is in motion.
Is kinetic energy dissapated into heat and energy?
Yes, kinetic energy can be dissipated into heat and other forms of energy through processes like friction and collisions. This is known as energy dissipation, where the initial kinetic energy of an object is converted into other energy forms due to interactions with its surroundings.
Is the kinematics equations true if acceleration is not uniform?
The answer is "No". If acceleration changes, forces of inertia should be taken to consideration. It requires dynamic equations of motion. However, if acceleration changes are not significant, you may continue using kinematics. To check if kinematic solution is within required precision limits you need to compare the solution of kinematic and dynamic equations and decide if kinematic solution is good enough.
What is 7.44 miles per hour in kilometers per hour?
7.44 miles per hour is equivalent to approximately 11.98 kilometers per hour.
What parts of a car use kinetic energy?
The wheels and engine components of a car use kinetic energy. When the car is in motion, kinetic energy is generated and transferred to these components to enable movement.
600 km per second is extremely fast. It is approximately 2.16 million km per hour or around 1.34 million miles per hour. At this speed, you could travel around the Earth's equator in just over 6 minutes.
How fast does the elevator travel in mph?
Elevators typically travel at speeds ranging from 500 feet per minute to 2,000 feet per minute, which is approximately 5 to 20 miles per hour. The speed can vary depending on the building's height and design.
How do you calculate the velocity of a moving object from two points on a position time graph?
First, note that velocity is a vector quantity. This means it has a magnitude (the speed) as well as a direction.
The magnitude of the velocity is the difference in position divided by difference in time. Hopefully, the direction should be evident from the graph.
Can kinetic energy and potential energy both increase when a gas filled balloon is rising in air?
Yes, both kinetic energy and potential energy can increase when a gas-filled balloon is rising in air. As the balloon rises, it gains potential energy due to its increased height above the ground. At the same time, the balloon also gains kinetic energy as it accelerates upward, increasing its speed.
How do you find final speed if acceleration time and beginning velocity is given?
You can find the final speed by using the formula: final speed = initial velocity + (acceleration * time). Plug in the given values for initial velocity, acceleration, and time into the formula to calculate the final speed.
Mach 1 at sea level is 340.3 m/s, 761.2 mi/h, 1,225 km/h, so Mach 82 would be 82 times faster.
so Mach 82 is...
27,904.6 m/s
62,418.4 mi/h
100,450 km/h
According to Lami's theorem, if a particle under the simultaneous action of three forces is in equilibrium, then each force has a constant ratio with the sine of the angle between the other two forces.
As long as the mass is the same in both cases, it doesnt enter the calculations.
The height (s) from which to drop it so its velocity at impact is 100 kph (27.78 metres per second):
Use >
s = (v2 - u2) / (2 * a)
s = 771.73 / 19.64
s = 39.29 metres
>
u = 0 (initial velocity - metres per second)
v = 27.78 (final velocity - metres per second)
a = 9.82 (acceleration due to gravity - (m/s)/s)
s = ? (distance - in this case , height)
What is the speed of a car traveling 45 miles in 30 minutes?
To find the speed of the car, you divide the distance traveled by the time taken. In this case, 45 miles divided by 30 minutes equals 1.5 miles per minute. So, the speed of the car is 1.5 miles per minute.
Ahorizontal line on a velocity vs time graph does not indicate any acceleration because there is no slope. Speed remains constant.
Does the speed of a position time graph of an object gives the speed of the object?
No, but the slope of the graph does.
Is there a connection between absolute zero and potential and kinetic energy?
Absolute zero is the (theoretical) limit at which all molecular movement stops (that means that the total kinetic energy of all the molecules in the substance being cooled to absolute zero becomes zero).
I'm not exactly sure, but since I know that Usain Bolt ran a top speed of 27.9 mph in his 100m world record of 9.58 s, I would guess that Asafa Powel ran maybe 25-26 mph when he ran 9.72 s.
Kinetic Energy = 1/2 * mass * velocity squared
KE = 1/2mV2
KE = 1/2(35 kg)(1 m/s)2
= 18 Joules
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How is instantaneous acceleration related to a velocity-time graph?
Acceleration is the derivative of velocity (a=dv/dt). If you are not familiar with calculus then it would be sufficient to say that the slope of the line tangent to the graph, only touches at one point, is equal to the instantaneous acceleration.
