what is acceleration give example of positive and negative zero
Answers
Answer:
The body moves in a straight line, it neither speed up or down nor change direction . 【 In vector form , if angle between velocity vector and acceleration vector is less than 90° and greater than 0° then it is positive acceleration and if it is less than 180° and greater than 90° then it is negative acceleration.
POSITIVE WORK: The work done on an object is said to be positive work when force and displacement are in same direction.
Example: When an object moves on horizontal surface, force and displacement acts in same direction. So, work done is positive.
NEGATIVE WORK: The work done is said to be negative work when force and displacement are in opposite direction.
Example: When an object is thrown upwards,the force of gravity is in downward direction whereas displacement acts in upward direction.
ZERO WORK: The work done is said to be zero when force and displacement are perpendicular to each other or when either force or displacement is zero.
Example: When we hold an object and walk, the force acts in downward direction whereas displacement acts in forward direction.