1 Distinguish between distance and displacement for a) an object moving along a straight line b)an object moving in - Science - Motion

Question

1 Distinguish between distance and displacement for
a) an object moving along a straight line
b)an object moving in a plane
2 Give an example where the speed on object first increases,then
remains constant for some time,and then decreases

3 A girl bends to touch her toes Is the motion of her head an
example of uniform motion or accelerated motion Explain

Somnath physics · Accepted Answer

1 a)

For an object moving in a straight
line, distance travelled and the displacement are equal in
magnitude
1 b)

For an object moving in a plane,
the distance travelled is the length of the path travelled and the
displacement is the straight line distance between the initial and
the final point of the object
2

The kind of motion that you have
asked in the question can be observed in the case of a parachutist
When the person jumps from a helicopter or an aeroplane, his
velocity first increases till the time terminal velocity is reached
Then he falls with a constant terminal velocity When he releases
the parachute, his velocity decreases to a value which is safe for
landing
3

The motion of her head is an
example of accelerated motion Since, the head follows a curved
path