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Two differences between distance and displacement formula

Октябрь 2, 2012

two differences between distance and displacement formula

Distance is a scalar quantity and displacement is a vector quantity. Distance has only magnitude. It measures the actual ground covered. In physics, distance and displacement are used to indicate the length between two points. However, these two are not one and the same thing. (B) describe and analyze motion in one dimension using equations with the concepts of distance, displacement, speed, average velocity, instantaneous velocity. NRL ROUND 20 BETTING ODDS

In Physics, displacement is indicated using an arrow vector. The arrow is drawn from the point at which an object starts from and ends where the object ends. The length of the arrow or vector corresponds to the magnitude of the movement while the arrow itself points in the direction of movement.

Displacement can have both positive and negative values and can even be zero. Negative values are used to indicate a change to the left. Displacement is the shortest distance and path from start to end. An easy way to indicate displacement is then to simply draw an arrow from the starting point to the ending point across the shortest path. The SI unit for displacement is also the meter but unlike distance, it is always measured along a straight line.

Since displacement takes change of direction into account, it can cancel out distance travelled. For instance if a person walks 10m west and then turns and walks back 10m to the east, displacement is 0. Walking in the exact same distance in the opposite direction cancels out the distance walked, hence no displacement. However, if the person walks 20m to the right, in a straight line, displacement will be equal to distance as here distance is the shortest path and is to the right so displacement is a positive value.

An object could move in a circuitous fashion, but the displacement would be the straight line shortest distance from start to finish. The final position is represented by xf. One always subtracts the initial starting point from the final ending point. Velocity is average speed and is thus based on change in position over change in time. It is also a vector quantity, thus it is calculated as the displacement divided by change in time. What is the difference between distance and displacement?

Distance is a scalar measure while displacement is a vector. Displacement is indicated with an arrow while distance is never indicated with an arrow. Distance only considers magnitude while displacement takes into account both magnitude and direction. Displacement can have both positive and negative values while distance can only have positive values.

Then compare and discuss definitions as a class. What components are necessary for a definition of motion? Defining Motion Our study of physics opens with kinematics—the study of motion without considering its causes. Objects are in motion everywhere you look. Everything from a tennis game to a space-probe flyby of the planet Neptune involves motion.

When you are resting, your heart moves blood through your veins. Even in inanimate objects, atoms are always moving. How do you know something is moving? The location of an object at any particular time is its position. More precisely, you need to specify its position relative to a convenient reference frame. Earth is often used as a reference frame, and we often describe the position of an object as it relates to stationary objects in that reference frame.

In other cases, we use reference frames that are not stationary but are in motion relative to Earth. To describe the position of a person in an airplane, for example, we use the airplane, not Earth, as the reference frame.

See Figure 2. Thus, you can only know how fast and in what direction an object's position is changing against a background of something else that is either not moving or moving with a known speed and direction.

The reference frame is the coordinate system from which the positions of objects are described. Figure 2. Why or why not? It is related to other English words, such as cinema movies, or moving pictures and kinesiology the study of human motion.

Your classroom can be used as a reference frame. In the classroom, the walls are not moving. Your motion as you walk to the door, can be measured against the stationary background of the classroom walls. You can also tell if other things in the classroom are moving, such as your classmates entering the classroom or a book falling off a desk. You can also tell in what direction something is moving in the classroom.

If you remained seated as your classmates left the room, you would measure their movement away from your stationary location. If you and your classmates left the room together, then your perspective of their motion would be change. You, as the reference frame, would be moving in the same direction as your other moving classmates. As you will learn in the Snap Lab, your description of motion can be quite different when viewed from different reference frames.

Relate this to the origin of a coordinate grid.

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Distance and displacement introduction - One-dimensional motion - AP Physics 1 - Khan Academy

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