Question

Multiple Choice Question:
1. If a bus starts suddenly, the passengers in the bus will tend to fall
(a) In the direction opposite to the direction of motion of the bus
(b) In the same direction as the direction of motion of the bus (c) sideways
2. An athlete runs some distance taking a long jump because
(a) It helps him to apply large force (b) by running action and reaction forces increases
(c ) by running the athlete gives himself larger inertia of motion
3. Momentum gives a measure of
(a) Mass (b) velocity (c) quantity of motion
4. The rate of change of momentum w.r.t time is measured in
(a) kg m/s2

(b) kg m (c) kg

5. When a carpet is beaten with a stick, dust comes out of it
(a) Due to momentum (b) due to force (c) due to inertia
6. A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of
400 m in 20 s. Find its acceleration. Find the force acting on it if it’s mass is 7 tonnes (Hint: 1 tonne
= 1000 kg.)
(a) 14000N (b) 15000N (C) 12500N
7. A stone of 1 kg is thrown with a velocity of 20 ms-1

across the frozen surface of a lake and comes to
rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?
(a) -4N (b) 4 N (c)2 N
8. How much net force is required to accelerate a 1000 kg car at 4.00 m/s2
?

(a) 4000N (b) 4500N (c) 5000N
9. If you apply a net force of 3 N on .1 kg-box, what is the acceleration of the box
(a) 2 m/s2
(b) 30 m/s2

(c) 10 m/s2
10. If a net force of 7 N was constantly applied on 400 g object at rest, how long will it take to raise its
velocity to 80 m/s
(a) 2.23 s (b) 3.47 s (c) 4.57 s
Answer the Following:
1. What is the acceleration produced by a force of 12 Newton exerted on an object of mass 3 kg?
2. A force of 5 N produces an acceleration of 8 ms-2

on a mass m1 and an acceleration of 24 ms-2
on
a mass m2. What acceleration would the same force provide if both the masses are tied together?
3. The velocity-time graph of a ball moving on the surface of a floor is shown in the figure. Find the
force acting on the ball if the mass of the ball is 50 g.

4. 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 0 to 3 s.
(b) Calculate the force on the object in the time interval 6 to 10 s.
(c) Is there any time interval in which no force acts on the object? Justify your answer.

Answer 1

Answer:

1.B

2.He gains energy to take him through the long distance

3.quantity of motion

4.Kg m/s2