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Newton’s laws of motion are three statements that describe the relationships between the forces acting on a body and its motion, and are the cornerstone of classical mechanics. They were first established by English physicist and mathematician Isaac Newton.
1. Passengers are pushed back when a bus starts abruptly. Which of the following is an example of this?
a) The first law of Newton
b) The second law of Newton
c) The third law of Newton
d) None of Newton’s laws apply to you.
Answer: Correct option will be (a) The first law of Newton.
Reason: The law of inertia of rest, sometimes known as Newton’s first law, causes passengers to slide backward when a bus abruptly starts moving.
2. The mass of a body is equivalent to the ratio of the force acting on it to the acceleration it generates.
a) the gravitational mass
b) the mass of the electromagnetic field
c) the mass of the internal organs
d) the mass of inertia
Answer: Correct option will be: (d) the mass of inertia)
3. When a passenger on a bus travelling at a constant speed is pushed backward, the bus accelerates forward) This force is referred to as
a) gravitational force
b) real force.
c) fictitious or pseudo force
d) Frictional force
Answer: Correct option will be: (c) fictious or pseudo force.
4. What is the mass of a body that accelerates at a rate of 2.6 m/s2 with a force of 90 N?
a) 44.6 kg
b) 34.6 kg
c) 54.6 kg
d) None of the mentioned
Answer: Correct option will be: (b) 34.6 kg
To calculate the mass, we will use the formula: m=Fa where, F is the force and a is the acceleration.
5. Which of the following has the greatest inertia?
a) A single atom
b) a molecule
c) A one-rupee coin
d) a cricket ball
Answer: Correct option will be: (d) a cricket ball.
Reason: The heavier an object is, the more difficult it is to move it or the more force is necessary to move it, resulting in a higher inertia)
6. In 5 seconds, an automobile speeds from 18 km/h to 36 km/h. What is the acceleration of the automobile in m/s?
a) 0.5 m/s²
b) 3 m/s²
c) 1 m/s²
d) 2 m/s²
Answer: Correct option will be: (c) 1 m/s².
7. If the force applied to a body is doubled and the mass is cut in half, What would be the accelerations’ ratio?
a) 1:2
b) 2:1
c) 1:4
d) 4:1
Answer: Correct option will be: (c) 1:4
8. On a flat surface, a block of wood is placed) To move the body, a force is provided parallel to the surface. The frictional force develops in the following directions:
a) normal to the surface upwards
b) normal to the surface downwards
c) along the applied force’s direction
d) opposite to the applied force’s direction
Answer: Correct option will be: (d) opposite to the applied force’s direction
9. On the roof of a train travelling on horizontal rails, a simple pendulum swing. If the pendulum’s string is pointing towards the front, the train is-
a) Moving at a steady speed
b) Moving with acceleration
c) Moving with retardation
d) At rest
Answer: Correct option will be: (c) moving with retardation.
10. Unless driven to act otherwise by an external force, every body remains in its condition of rest or uniform motion along a straight line. This is the
a) Inertia Law.
b) Newton’s first law
c) Both a and b
d) None of the above
Answer: Correct option will be: (c) Both a and b)
11. If a body’s net external force is zero, it has
a) zero velocity
b) zero acceleration
c) non-zero acceleration
d) none.
Answer: Correct option will be: (b) zero acceleration.
12. What are the components required to calculate the momentum of a body?
a) Mass and acceleration
b) Velocity and mass
c) Displacement and mass
d) None of the mentioned
Answer: Correct option will be: (b) velocity and mass.
13. The quicker the momentum changes
a) The force is less
b) The force is greater
c) The force is zero
d) There is no force.
Answer: Correct option will be: (b)the force is greater.
14. A body’s rate of change of momentum is:
a) Inversely related to applied force
b) Directly related to applied force
c) Does not depend on applied force
d) None of the mentioned
Answer: Correct option will be: (b)directly related to applied force.
15. The rate at which a body’s momentum changes is proportional to the force applied and occurs in the direction in which the force is applied) This is:
a) the first law of motion
b) second law of motion
c) law of inertia
d) third law of motion
Answer: Correct option will be: (b) second law of motion
16. There is an opposite and equal reaction to every action. This situation is described by:
a) the first law of motion
b) second law of motion
c) law of inertia
d) third law of motion
Answer: Correct option will be: (d) third law of motion
17. The component of contact force that is perpendicular to the surface in contact is referred to as:
a) Frictional force
b) Normal reaction force
c) Both a and b
d) None of the mentioned
Answer: Correct option will be: (b) normal reaction force.
18. A monkey is sitting at a spring balance that reads 60 kilograms. What effect will the monkey having jumped off the balance have on the reading?
a) Decrease
b) Increase
c) No change in reading
d) First increase and then becomes zero
Answer: The correct option will be: (d) First increase and then becomes zero
