0
Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
How are scalar and vector quantities similar?
Scalar and vector quantities are both used in physics to describe properties of objects. They both have magnitude, which represents the size or amount of the quantity. However, the key difference is that vector quantities also have direction associated with them, while scalar quantities do not.
If an object is speeding up to the right what direction does its velocity vector point?
The velocity vector of an object that is speeding up to the right points in the same direction, to the right. Velocity is a vector quantity that includes both magnitude (speed) and direction, so as the object accelerates, the velocity vector will align with the direction of motion.
Calculate the change in potential energy of 8 million kg of water dropping 50 m over Niagara Falls?
The change in potential energy can be calculated using the formula:
ΔPE = mgh
Where: m = mass of water = 8,000,000 kg g = acceleration due to gravity = 9.81 m/s^2 h = height = 50 m
ΔPE = 8,000,000 kg * 9.81 m/s^2 * 50 m = 3,924,000,000 J
Therefore, the change in potential energy is 3,924,000,000 Joules.
A graph showing zero slope for the position vs time always indicates that the object is not moving?
If the speed/time graph slops negatively, that's an indication that the speed
is decreasing, i.e. the object is slowing down. The negative slop is also called
negative acceleration, since acceleration is the rate of change of velocity.
Answer 1
Depends what the speed limit is.
Answer 2
It all depends on...
# If you are in a vehicle or not # If you are in a collision course with another object # If the other object is not static, its approach speed # What safety protection you and/or your vehicle has # If the safety equipment is in good working order If you are not in a vehicle of any sort, you may have serious problems, unless, of course, you are self-propelled and travelling parallel to, or away from the earth.
If people can't create energy then where do we get energy?
We use energy that has been in existence, in some form, since the beginning of the Universe.
Actually, humans do "create" energy. We use a chemical process to break down various food molecules, releasing the bonding energy which formerly held such molecules together.
As the mass of an object moving at a given speed decreases its kinetic energy does what?
As the mass of an object moving at a given speed decreases, its kinetic energy also decreases proportionally. Kinetic energy is directly proportional to the mass of the object, so a decrease in mass will result in a decrease in kinetic energy.
What is the mass of an object with kinetic energy?
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
Kinetic energy = 1/2 mass x speed2
If you know any two of the three items, you can calculate the third one with this formula.
How many yards per minute is this if you are going 12 miles an hour?
12 mph equates to 352 yards per minute.
Does a horizontal line on a distance-time graph means the object is moving at a constant speed?
You cannot. A distance vs time graph only measures radial distance - that is, distance from the origin to the object. If the object is going around the origin along a circular path, the distance vs time graph will not show any change in distance.
The [incorrect] answer that you are required to give is that the graph will be a horizontal line during that period. But as explained above, the horizontal graph only means the object has no movement towards or away from the origin, not that it has no movement.
If you Add up the total kinetic energy and potential energy what does that give you?
The sum of potential and kinetic energy gives you the Mechanical Energy of the system
Average velocity always equals one-half the sum of the initial and final velocities?
Is this a question? or a statement that you are unsure of?
Well anyways, this would be correct if acceleration was a constant but if acceleration is not a constant, the (not-constant) acceleration would change the rate of velocity and thus that statement/question would be false.
When you add heat to a solid does its kinetic energy rise?
Yes, adding heat to a solid increases the kinetic energy of its particles, causing them to vibrate more rapidly within their fixed positions. This increase in kinetic energy leads to a rise in temperature, which can eventually cause the solid to melt into a liquid.
What is the momentum and derive the formula for the momentum?
Momentum is the product of the mass and the velocity of an object. It's SI unit is kgms-1.
Correct, but perhaps more easily interpreted as kgm/s.
Vf = Vi + at
Where Vf = final velocity
Vi = initial velocity
a = acceleration
t = time
The equation that relates the distance traveled by a constantly accelerating object to its initial velocity, final velocity, and time is the equation of motion: [ \text{distance} = \frac{1}{2} \times (\text{initial velocity} + \text{final velocity}) \times \text{time} ]
This equation assumes constant acceleration.
Convert 30000 feet into miles per hour?
To convert feet to miles, divide by 5280 (1 mile = 5280 feet). To convert hours to miles per hour, divide distance in miles by time in hours. Thus, to convert 30000 feet to miles per hour, first convert feet to miles (30000/5280), then divide by the number of hours to get miles per hour.
Which word equation is used to calculate the acceleration of a object?
The word equation used to calculate acceleration is: acceleration = change in velocity / time taken. This equation quantifies how an object's velocity changes over a period of time, giving a measure of its rate of acceleration.
You jump down and the trampoline streches potential or kinetic energy?
When you jump down onto the trampoline, the initial potential energy from your height is converted into kinetic energy as you descend. When you bounce back up, the kinetic energy is then converted back into potential energy as you reach the top of the bounce.
More differences between simple harmonic motion and periodic motion with practical examples?
Simple harmonic motion is a type of periodic motion where the restoring force is directly proportional to the displacement from equilibrium. Practical examples include a swinging pendulum or a mass-spring system. Periodic motion, on the other hand, refers to any repeated motion that follows the same path at regular intervals, such as the motion of a wheel rotating. So, while all simple harmonic motion is periodic, not all periodic motion is necessarily simple harmonic.
Is a 100 yard dash a scalar or vector quantity?
Scalar because you give only the distance, not direction as well. It would also be scalar if you had quoted only the speed (not velocity), for the same reason. A vector has magnitude and direction.
none of the above
Force centripetal = (mass * velocity^2) ÷ radius
More mass , more force needed to keep object in the circle
Object going faster, more force needed to keep object in the circle
Larger radius, less force needed to keep object in the circle
That is why mass and velocity are in the numerator ( multipliers)
and Radius is in the denominator ( divider)
The acceleration of the body was zero during this interval because its velocity was constant. Acceleration is the rate of change of velocity, so if the velocity does not change, the acceleration is zero.
