Practice free Laws of Motion (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A particle of mass m is projected with velocity v making an angle of with the horizontal. When the particle lands on the level ground the magnitude of the change in its momentum will be
Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be
To keep the belt moving at the same speed, the force required will be equal to change in its momentum.
Force required, F=
=v
As velocity v is constant, hence,
F = Mv newton
The driver of a car travelling at velocity v suddenly see a broad wall in front of him at a distance d. He should
When driver applies brakes and the car covers distance x before coming to rest, under the effect of retarding force F
then ⇒
But when he takes turn then ⇒
It is clear that x = r/2
i.e. by the same retarding force the car can be stopped in a less distance if the driver apply breaks. This retarding force is actually a friction force.
It is easier to draw up a wooden block along an inclined plane than to haul it vertically, principally because
Opposing force in vertical pulling = mg
But opposing force on an inclined plane is mg sinθ, which is less than mg.
Which of the following statements correctly describes Newton's First Law of Motion?
According to the NCERT text, 'To summarise, if the net external force is zero, a body at rest continues to remain at rest and a body in motion continues to move with a uniform velocity.' This accurately describes Newton's First Law, emphasizing uniform velocity, not constant acceleration, in the absence of a net external force.
The property of a body to resist a change in its state of rest or uniform motion is called:
The NCERT text states: 'This property of the body is called inertia. Inertia means ‘resistance to change’.' Therefore, inertia is the correct term for this property.
If the net external force acting on a body is zero, its acceleration will be:
The text states that Newton's second law is consistent with the First Law ($F = 0$ implies $a = 0$). This means if the net external force is zero, the acceleration (rate of change of velocity) is also zero. This aligns with the concept of inertia, where a body maintains its state of motion (either rest or uniform velocity).
Galileo's experiments involving a ball rolling on inclined planes led to the conclusion that:
The NCERT text mentions: 'Galileo thus, arrived at a new insight on motion that had eluded Aristotle and those who followed him. The state of rest and the state of uniform linear motion (motion with constant velocity) are equivalent. In both cases, there is no net force acting on the body.'
A book is at rest on a horizontal table. According to Newton's First Law, the net external force on the book is:
The NCERT text explains: 'We observe the book to be at rest. Therefore, we conclude from the first law that the magnitude of R equals that of W. A statement often encountered is : “Since W = R, forces cancel and, therefore, the book is at restâ€. This is incorrect reasoning. The correct statement is : “Since the book is observed to be at rest, the net external force on it must be zero, according to the first law.''
Which of the following scenarios demonstrates a consequence of inertia?
Inertia is the resistance to change in the state of motion. When a moving bus suddenly brakes, the passenger tends to continue moving forward due to their inertia, illustrating this principle.
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