How fast you move and in what direction

Another way of visualizing the motion of an object is to use a graph. A plot of position or of velocity as a function of time can be very useful. For example, for this trip to the store, the position, velocity, and speed-vs. Note that these graphs depict a very simplified model of the trip. We are also assuming that the route between the store and the house is a perfectly straight line. Figure 4.

Position vs. Note that the velocity for the return trip is negative. If you have spent much time driving, you probably have a good sense of speeds between about 10 and 70 miles per hour. But what are these in meters per second? To get a better sense of what these values really mean, do some observations and calculations on your own:. A commuter train travels from Baltimore to Washington, DC, and back in 1 hour and 45 minutes.

The distance between the two stations is approximately 40 miles. Note that the train travels 40 miles one way and 40 miles back, for a total distance of 80 miles. Give an example but not one from the text of a device used to measure time and identify what change in that device indicates a change in time. There is a distinction between average speed and the magnitude of average velocity. Give an example that illustrates the difference between these two quantities.

Does its speedometer measure speed or velocity? If you divide the total distance traveled on a car trip as determined by the odometer by the time for the trip, are you calculating the average speed or the magnitude of the average velocity? Under what circumstances are these two quantities the same? How are instantaneous velocity and instantaneous speed related to one another? How do they differ? A helicopter blade spins at exactly revolutions per minute.

Its tip is 5. At this rate how long will it take them to drift km farther apart than they are at present? Los Angeles is west of the fault and may thus someday be at the same latitude as San Francisco, which is east of the fault. How far in the future will this occur if the displacement to be made is km northwest, assuming the motion remains constant?

Its run from Denver to Chicago took 13 hours, 4 minutes, 58 seconds, and was witnessed by more than a million people along the route. The total distance traveled was Tidal friction is slowing the rotation of the Earth. A student drove to the university from her home and noted that the odometer reading of her car increased by The trip took The speed of propagation of the action potential an electrical signal in a nerve cell depends inversely on the diameter of the axon nerve fiber.

If the nerve cell connecting the spinal cord to your feet is 1. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back that is, neglecting any time delays in the electronic equipment.

Calculate the distance from Earth to the Moon given that the echo time was 2. In physics, three possible types of motion are considered: constant velocity, constant acceleration, and variable acceleration.

Answer:- Linear motion or rectilinear motion means moving in a straight line. Translatory motion or translational motion occurs when all points in a body move the same distance in the same amount of time. Examples Of Motion involve motion. There is a change of position of the object involved in these activities. The flow of air in and out of our lungs is also an example of motion.

The automobiles that carry passengers from the place of pick up to the destination possess motion. In physics, motion is the phenomenon in which an object changes its position over time.

Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. Motion is caused by forces. A stationary object does not move unless a force acts on it to start it going. Once it is moving, it carries on at the same speed and in the same direction unless a force makes it speed up, change direction or slow down and stop.

Motion is the change in the position of an object with respect to its surroundings. It is the distance moved by an object or its displacement. The distance moved by an object in a unit time is called its speed. The speed of an object helps to compare whether a body is moving fast or slow. While this might result in a frenzy of activity, it would result in a zero velocity. Because the person always returns to the original position, the motion would never result in a change in position.

Since velocity is defined as the rate at which the position changes, this motion results in zero velocity. If a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. Every step must go into moving that person further from where he or she started. For certain, the person should never change directions and begin to return to the starting position.

Velocity is a vector quantity. As such, velocity is direction aware. When evaluating the velocity of an object, one must keep track of direction. One must include direction information in order to fully describe the velocity of the object. This is one of the essential differences between speed and velocity. Speed is a scalar quantity and does not keep track of direction ; velocity is a vector quantity and is direction aware.

The task of describing the direction of the velocity vector is easy. The direction of the velocity vector is simply the same as the direction that an object is moving. It would not matter whether the object is speeding up or slowing down. If an object is moving rightwards, then its velocity is described as being rightwards. If an object is moving downwards, then its velocity is described as being downwards. Note that speed has no direction it is a scalar and the velocity at any instant is simply the speed value with a direction.

Let's begin implementing our understanding of these formulas with the following problem:. Q: While on vacation, Lisa Carr traveled a total distance of miles. Her trip took 8 hours. What was her average speed? That was easy! Lisa Carr averaged a speed of 55 miles per hour. Yet, she averaged a speed of 55 miles per hour.

The above formula represents a shortcut method of determining the average speed of an object.