Positive, negative and zero work Think before you answer Discuss the directions of force and of displacement in each of the following cases. 1. Pushing a stalled vehicle Fand sale insamce disection 2. Catching the ball which your friend has thrown towards you. 3. Tying a stone to one end of a string and swinging it round and round by the other end of the string. 4. Walking up and down a staircase; climbing a tree. 5. Stopping a moving car by applying brakes. and also explain it
Answers
Answer:
plize klick on brainlests
Explanation:
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.