A rock is thrown straight upward, then falls back down. Consider the motion of the rock from the time just after it is thrown, to the time just before it hits the ground. Neglect air resistance. Which of the following quantities is zero at least one point in the rock’s flight? A. Neither acceleration, nor velocity B. Acceleration C. Velocity D. Both acceleration and velocity Which of the following quantities changes direction during the rock’s flight? A. Neither acceleration, nor velocity B. Acceleration C. Velocity D. Both acceleration and velocity Which of the following quantities is constant during the rock’s flight? A. Neither acceleration, nor velocity B. Acceleration C. Velocity D. Both acceleration and velocity
Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
A rock is thrown straight upward, then falls back down. Consider the motion of the rock from the time just after it is thrown, to the time just before it hits the ground. Neglect air resistance.
Which of the following quantities is zero at least one point in the rock’s flight?
| A. Neither acceleration, nor velocity |
| B. Acceleration |
| C. Velocity |
| D. Both acceleration and velocity |
Which of the following quantities changes direction during the rock’s flight?
|
Which of the following quantities is constant during the rock’s flight?
|
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