The displacement of a particle is given by x = (t – 2)2 where x is in meters and t in seconds. The distance covered by the particle in the first 4 seconds is
The ratio of displacement to distance is
As the magnitude of displacement always either less than or equal to distance travel. Hence, the numerical ratio of displacement to distance is either less than or equal to 1.
A vehicle travels half the distance L with speed V1and the other half with speed V2, then its average speed is
Which of the following statements about distance is true:
Which of the following quantity remains constant during the uniform circular motion?
When a body is in uniform circular motion, its speed remains constant but its velocity, angular acceleration, angular velocity changes due to change in its direction.
The magnitude of average velocity is equal to the average speed if the motion of an object is along a straight line and in the same direction.
Answer: The magnitude of average velocity of an object is equal to its average speed, only in one condition when an object is moving in a straight line.
A particle is moving along a circle of radius R such that it completes one revolution in 40 seconds. What will be the displacement after 2 minutes 20 seconds?
The numerical ratio of velocity to speed is:
When an object is moving along a straight path, magnitude of average velocity is equal to the average speed. Therefore, numerical ratio of average velocity to average speed is one in a straight line motion.
But, during curved motion, the displacement<distance covered, so the velocity<speed.
Two escalators move people up and down between floors of a shopping mall at the same rate, either up or down. What of the following statements regarding the motion of the escalators is true?
A coordinate system that enables us to describe the position of a body in space at any instant of time is called
The displacement of a particle starting from rest (at t = 0) is given by s = 6t2-t3 . The time in seconds at which the particle will attain zero velocity again, is
0 = 3t (4 - t) t - 0 or 4s
Here t = 0 is not realistic so at t = 4s the velocity will be zero.
The displacement of an object may be
If a body does not change its direction during the course of its motion, then
36 km/h is equal to:
36Km/h = 36*1000/3600 m/s (1Km. = 1000m. & 1hour = 3600sec.)
= 10 m/s
The ratio of magnitude of velocity and speed is always:
The displacement of the body in given time is always equal to or less than distance covered, because, velocity is displacement per unit time and speed is distance covered per unit time, therefore, ratio of magnitude of velocity and speed is always equal to or less than one.
Suppose our school is 1 km away from our house, and we go to school in the morning, and in the afternoon we come back. Then, the total displacement for the entire trip is
An object is in uniform motion along a straight line if it
A man starts from his home with a speed of 4 km/h on a straight road up to his office 5 km away and returns to home, then the path length covered is
A car covers a distance of 5 km in 5 mins, its average speed is equal to
Which of the following is not an example of a rectilinear motion?
Rectilinear motion is another name for straight-line motion. This type of motion describes the movement of a particle or a body. A body is said to experience rectilinear motion if any two particles of the body travel the same distance along two parallel straight lines.