2. The velocity-time graph of an object of mass m = 50 g is shown in figure. Observe the graph carefully and answer the following questions.
(a) Calculate the force on the object in time interval 6 to 10 s
b) Distance travelled from 3s to 10 s
(c) When there is no force acting on the object? Justify your answer. 3m
3 Identify the type of inertia acts:
a) We fall backward when bus suddenly starts moving.
b) Dry leaves fall down when we shake the branches of a tree.
c. Water spills down when we turn suddenly holding a glass full of water.
d. An athlete runs a short distance before taking a jump.
4. Give reasons:
a. When a boy jumps off the boat it moves backwards.
b) It is dangerous to jump from a moving bus.
c). Two objects move with same velocity. Identify the probable factor which makes one of them has greater momentum.
d. How do we feel the presence of force.?
e. If the first law of newtons hold good, why does the rolling foot ball comes to rest.
f) swimmer moves forward when he pushes water backwards.
5. The time taken to stop the ball rolling with velocity u is reduced to half. Find the change of the values of : a) initial momentum b) final momentum c) rate of change of momentm
of momentum,
6. Explain why?
a) Cricket ball causes more injury than tennis ball when hit a person
b) The speed of the object changes with time.
6. Identify the type of motion in the following graphs
7. Two balls A and B of masses m and 2m are in motion with velocities 2x and x respectively. Compare :
a) their inertia
b) their momentum
c) the force needed to stop them at same time.
8. Give the SI units of
a) force b) momentum . c) acceleration, d) velocity.
Answers
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Answer:
acceleration
50g pack momentum
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Answer:
where is graph?
Explanation:
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