16. (a) Differentiate between speed and velocity. (b) When is a body said to have uniform velocity? (c) How can we describe the position of an object?
Answers
Answer:
Explanation:
1) It is defined as the rate of change of distance.
1) It is defined as the rate of change of displacement.
2) It is a scalar quantity.
2) It is a vector quantity.
3) It can never be negative or zero.
3) It can be negative,zero or posituve.
4) Speed is velocity without direction.
4) Velocity is directed speed.
5) Speed may or may not be equal to velocity.
5) A body may possess different velocities but the same speed.
6) Speed never decreases with time. For a moving body, it is never zero.
6) Velocity can decrease with time. For a moving body , it can be zero.
7) Speed in SI is measured in ms-1.
7) Velocity in SI, is measured in ms-1.
If a body is travelling on a straight path with constant speed we say that body have uniform velocity.
We can describe the position of an object just by using the refference point which is also known as the orgin. take the example of vinnie's home is x km from the central park. Here the central park is being used as the refference point or as the orgin.