Explain the following concepts in your own words with everyday examples:
force, work, displacement, velocity, acceleration, distance.
Answers
Effect of force :
Fore can change the state of rest or motion of an object.
Force an change the shape or size of an object.
Force can increase or decrease the speed of motion.
Force can change direction of motion of ball changes
Example :
When we hit a ball with bat, the direction of motion of ball changes .
Work Done : Work is said to be done on an object when a force acts on it and objects moves through a distance.
Example :
Work is said to be done when we project a ball in air.
Distance : Distance is the path traversed by an object.
Displacement is the shortest path travelled by an object between source and destination in specified direction.
An athlete running in circular path has distance covered as 2πR and displacement as zero.
Velocity is the speed with direction.
Car moving with a speed of 40km/hr towards north direction.
Acceleration :
Rate of change of velocity
a=v-u/t
A train leaving a platform station has positive acceleration.
Explanation:
Displacement is a vector which points from the initial position of an object to its final position. The standard units of displacement are meters.
Velocity is a vector which shows the direction and rate of motion. The standard units of velocity are meters per second.
Speed and velocity are not the same thing: speed is a scalar, whereas velocity is a vector. One must use different rules when combining speeds and combining velocities.
The average velocity of an object is the total displacement during some extended period of time, divided by that period of time.
Instantaneous velocity, on the other hand, describes the motion of a body at one particular moment in time.
Acceleration is a vector which shows the direction and magnitude of changes in velocity. Its standard units are meters per second per second, or meters per second squared.