An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on
Why do you fall in the forward
direction when a moving bus
brakes to a stop and fall
backwards when it accelerates
from rest?
Explain why some of the leaves
may get detached from a tree if
we vigorously shake its branch.
In the following example, try to
identify the number of times the
velocity of the ball changes:
“A football player kicks a football
to another player of his team who
kicks the football towards the
goal. The goalkeeper of the
opposite team collects the football
and kicks it towards a player of
his own team”. Also identify the agent supplying
the force in each case.
Which of the following has more
inertia: (a) a rubber ball and a
stone of the same size? (b) a
bicycle and a train? (c) a five-
rupees coin and a one-rupee coin?
An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.
State which of the following situations are possible and give an example for each of these:
(a) an object with a constant acceleration but with zero velocity
(b) an object moving with an acceleration but with uniform speed.
(c) an object moving in a certain direction with an
acceleration in the perpendicular direction.
A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m s-2, with what velocity will it strike the ground? After what time will it strike the ground?
A driver of a car travelling at 52 km h–1 applies the brakes Shade the area on the graph that represents the distance travelled by the car during the period.
(b) Which part of the graph represents uniform motion of the car?
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