A value commonly taken for the perception-reaction time of motorists is At = 1.5 s. Using this value, determine the total stopping distance for a car travelling at 30 m - s-1 (two significant figures). In calculating the stopping distance, let's assume that the vehicle continues at its initial speed for At, then decelerates to rest. A reasonable value for the deceleration in braking is (constant) 8.0 m · s-2.
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.
![2. [#232] Stopping distance
A value commonly taken for the perception-reaction time of motorists is At = 1.5 s. Using this value, determine
the total stopping distance for a car travelling at 30 m - s-1 (two significant figures). In calculating the stopping
distance, let's assume that the vehicle continues at its initial speed for At, then decelerates to rest. A reasonable
value for the deceleration in braking is (constant) 8.0 m - s-2.
Stopping distance =
metres. (Hint: How many significant figures?)
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