Q.19) What is meant by acceleration? Give its units.
Q.20) What happens to the gravitational force when one of the mass is doubled and distance
is also doubled?
Q.21) Differentiate between speed and velocity.
Answers
Answer:
1 ) In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second² using an accelerometer.
2) If the mass of one of the objects is doubled, then the force of gravity between them is doubled. ... Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.
3.) Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
Explanation:
the rate of change of velocity of an object is called acceleration
units are km /m
20.yes
21.
