How the Mass of an Object Affects Its Motion | Sciencing
Momentum is a physics term; it refers to the quantity of motion that an object has. Momentum depends upon the variables mass and velocity. In terms of an equation, the momentum of an object is equal to the mass of the object times the . Average speed is the ratio of the distance an object Lesson Velocity is the speed and direction of an object's motion. Velocity velocity . mass. • Gravitational force depends on the mass of the objects and the distance between them. A moving object will gain the mass. In special relativity physics, mass of an object depends on the velocity of the object: m' Mass is a mathematical relation.
- Kinetic Energy
In a previous unit, it was said that the direction of the velocity vector is the same as the direction that an object is moving.
As a vector quantity, the momentum of an object is fully described by both magnitude and direction. The Momentum Equation as a Guide to Thinking From the definition of momentum, it becomes obvious that an object has a large momentum if both its mass and its velocity are large.
Both variables are of equal importance in determining the momentum of an object. Consider a Mack truck and a roller skate moving down the street at the same speed. The considerably greater mass of the Mack truck gives it a considerably greater momentum. Yet if the Mack truck were at rest, then the momentum of the least massive roller skate would be the greatest. The momentum of any object that is at rest is 0.Misconceptions About Falling Objects
Objects at rest do not have momentum - they do not have any " mass in motion. The momentum equation can help us to think about how a change in one of the two variables might affect the momentum of an object.
Kinetic energy - Wikipedia
The total mass of loaded cart is 1. If the cart was instead loaded with three 0. A doubling of the mass results in a doubling of the momentum. Similarly, if the 2. A quadrupling in velocity results in a quadrupling of the momentum.
Forces, acceleration and Newton's laws - AQA
Click the button to view the answers. The kinetic energy in the moving cyclist and the bicycle can be converted to other forms.
For example, the cyclist could encounter a hill just high enough to coast up, so that the bicycle comes to a complete halt at the top. The kinetic energy has now largely been converted to gravitational potential energy that can be released by freewheeling down the other side of the hill.
Since the bicycle lost some of its energy to friction, it never regains all of its speed without additional pedaling. The energy is not destroyed; it has only been converted to another form by friction. Alternatively, the cyclist could connect a dynamo to one of the wheels and generate some electrical energy on the descent.
The bicycle would be traveling slower at the bottom of the hill than without the generator because some of the energy has been diverted into electrical energy. Another possibility would be for the cyclist to apply the brakes, in which case the kinetic energy would be dissipated through friction as heat.
special relativity - Increase in Mass with Velocity - Physics Stack Exchange
Like any physical quantity that is a function of velocity, the kinetic energy of an object depends on the relationship between the object and the observer's frame of reference. Thus, the kinetic energy of an object is not invariant. Spacecraft use chemical energy to launch and gain considerable kinetic energy to reach orbital velocity. In an entirely circular orbit, this kinetic energy remains constant because there is almost no friction in near-earth space.
However, it becomes apparent at re-entry when some of the kinetic energy is converted to heat. If the orbit is elliptical or hyperbolicthen throughout the orbit kinetic and potential energy are exchanged; kinetic energy is greatest and potential energy lowest at closest approach to the earth or other massive body, while potential energy is greatest and kinetic energy the lowest at maximum distance.
Without loss or gain, however, the sum of the kinetic and potential energy remains constant. Kinetic energy can be passed from one object to another. In the game of billiardsthe player imposes kinetic energy on the cue ball by striking it with the cue stick. If the cue ball collides with another ball, it slows down dramatically, and the ball it hit accelerates its speed as the kinetic energy is passed on to it.