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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
Will equation of motion be valid for non uniform motion?
Newton's first law of motion states that momentum is a property of a mass system
that is conserved as long as no net force is applied on it.
If the question refers to Newton's second law of motion, the answer is yes.
Is second equation of motion valid for non uniform acceleration?
Yes. It just has to be remembered that the equation is describing a balance between
a force and the increment of momentum of the system per time unit on which the force is being applied "at a given instant t".
For a given system with constant mass m, we can write Newton's 2nd law of motion
as:
F(t) = m∙a(t)
where force F(t) and acceleration a(t) are a function of time (notice that if the force
is constant during time applied, acceleration results constant or uniform).
If you know how the force is varying in time (function F(t)), then you know the
function of acceleration in time: a(t) = F(t)/m
Why achanging velocity cannot maintaining constant speed?
Velocity is a vector quantity that includes both speed and direction. If the velocity is changing, it means either the speed, direction, or both are changing. Therefore, if the velocity is changing, the object cannot maintain a constant speed.
Why not all potential energy is converted to kinetic energy in roller coaster?
Not all potential energy is converted to kinetic energy in a roller coaster because some of the potential energy is lost due to friction, air resistance, and other forms of energy dissipation. This loss of energy results in not all of the potential energy being transformed into kinetic energy.
If the speed of the car becomes NV, with N > 1, the minimum distance it can be stopped over remains the same at S. This is because the stopping distance is primarily determined by factors like initial speed, braking capacity, and road conditions, rather than the multiple of the speed.
It depends on the context. In some situations, 60 kph could be considered fast, while in others it may be considered slow. It's important to consider factors such as speed limits, road conditions, and the type of vehicle being driven.
Can a position time graph tell in which directionthe displacement of an object is?
Yes. If the slope is positive, the direction of the displacement is positive (e.g. north, east, or right). If the slope is negative, the direction of the displacement is negative (e.g. south, west, or left).
Vector quantities are quantities that have both magnitude and direction. An easily understood example is velocity, which has both speed (the magnitude component) and direction. If we say 60 miles per hour or 8 knots per hour, and we add direction, like east or west, or course 220 magnetic, for example, we're talking about a vector. Electromagnetic fields also have amplitude (a measure of magnitude) like 10 volts/m and direction east or north for example. It really is that simple, and the investigator only has to remember the direction component and add it to a magnitude to lock in the idea.
Light is not a vector quantity, it has size and the speed of light 300 mega meters/second, but it does not have a direction. Another example is like saying I was driving home at 60 mph. The '60 mph' is a speed, but not a velocity (a vector) because there is no direction specified.
It is important in science to distinguish between vectors and real quantities. Real quantities do not have a direction. This can be seen as no direction or it can be seen as omnidirectional. Omnidirectional would be wrong, at best reals could be said to be origin directional. Positive real could be said to be toward the origin and negative real could be said to be away from the origin. Vectors are related to the origin and directional axis. Real numbers define the origin and a real axis, vector quantities define specifically directions and directional axis based on the real zero point.
How do you find mean kinetic energy when given only mass and horizontal distance traveled?
You don't have enough information in this case. Kinetic energy depends on mass and speed. Speed can be calculated as distance / time - and no time is given, nor is there any other information that allows you to calculate the time.
Note that even if time is given, you can calculate the average (mean) speed, but that will only give you a rough idea of the mean kinetic energy. In this problem, if the speed changes a lot, the average kinetic energy (averaged over time) will be greater than in the case of a constant speed. This is because kinetic energy is proportional to the square of the speed.
When does a cyclist appear to be stationary with respect to another moving cyclist?
A cyclist appears to be stationary with respect to another moving cyclist when they are both moving at the same speed and direction. This occurs when they maintain a consistent distance and speed relative to each other.
What line segments on a position versus time graph is physically imposable?
A physically impossible line segment on a position versus time graph would be one with a slope representing a speed greater than the speed of light or negative speed (moving backwards in time). These scenarios violate the laws of physics.
What is the gradient of acceleration time graph?
The gradient of an acceleration-time graph represents the rate at which the acceleration is changing over time. If the gradient is positive, it indicates an increase in acceleration, while a negative gradient indicates a decrease in acceleration. A horizontal line on the graph would represent a constant acceleration, where the gradient is zero.
106 kilometers per hour is equivalent to about 65.9 miles per hour.
What is the product of an object mass and velosity?
The product of an object's mass and velocity is its momentum. Momentum is a vector quantity that describes the quantity of motion of an object and is given by the product of its mass and velocity.
How are potential energy and kinetic energy transferred on the first hill of a roller coaster?
At the top of the first hill, PE is at its maximum, whereas KE is zero. When the train starts to fall down the first hill, PE decreases and KE increases. At the bottom of the hill, KE is at its maximum, and PE is zero.
Is sound energy a kinetic energy?
Well, yes; it is usually called "sound energy", but since it consists of movement of atoms, or pressure differences, it can also be considered a special kind of kinetic energy.
Well, yes; it is usually called "sound energy", but since it consists of movement of atoms, or pressure differences, it can also be considered a special kind of kinetic energy.
Well, yes; it is usually called "sound energy", but since it consists of movement of atoms, or pressure differences, it can also be considered a special kind of kinetic energy.
Well, yes; it is usually called "sound energy", but since it consists of movement of atoms, or pressure differences, it can also be considered a special kind of kinetic energy.
How can an object slowing down have an acceleration that's not negative?
If the positive direction was defined at the outset as the direction opposite to the
direction in which the object happens to be moving just now, and the object is
slowing down, then the acceleration is positive because, algebraically, the object's
speed is increasing in the positive direction.
When potential energy and kinetic energy is added it creates?
When potential energy and kinetic energy are added it creates total energy or Quaternion energy. Energy comes in two forms potential or real energy and vector or "kinetic " energy. Kinetic energy is rightfully vector energy and usually involves motion or velocity. However, torque 'fxr' is vector energy not considered as kinetic energy.
The bottom line is, there is real energy like real numbers called potential energy and there is vector energy like kinetic energy mcV, (momentum related energy).
Gravitational energy is an example E= -GmM/r + mcV = -mu/r + mcV
Newton ignored the kinetic energy of mcV in his gravitational theory. Quaternions are yet to be recognized in science and mathematics as the true numbers of Nature.
Sliding Kinetic Friction is usually greater than Rolling Kinetic Friction. Sliding Kinetic Friction is caused by two objects being dragged together, providing more opportunity for the objects' microscopic hills and valleys to catch.
Is it possible for a body to have average speed but zero average velocity give reason and example?
Yes it is possible.
If a body goes round a circular path then distance covered by one full rotation will be 2 pi r
But the total displacement is 0.
Hence the average speed exists but average velocity does not exist.
On a pendulum, the greatest potential energy is at the highest point of the swing on either side, and the greatest kinetic energy is at the bottom of the swing.
On a roller coaster, the greatest potential energy is at the top of a hill, and the greatest kinetic energy is at the bottom of the hill.
Do robots have kinetic energy?
Yes, robots can have kinetic energy when they are in motion. Kinetic energy is the energy possessed by an object due to its motion, so when a robot is moving, it possesses kinetic energy like any other object in motion.
How fast can the fastest person in the world run in mph?
World records for the 100-meter dash are . . .
Men:
Usain Bolt, August 16, 2009, 9.58 seconds = 23.35 mph
Women:
Florence Griffith-Joyner, July 16, 1988, 10.49 seconds = 21.32 mph
