Advertisements
Advertisements
प्रश्न
A force F1 acts on a particle accelerating it from rest to a velocity v. Force F1 is then replaced by F2 which decelerates the particle to rest.
विकल्प
F1 must be equal to F2.
F1 may be equal to F2.
F1 must be unequal to F2
Advertisements
उत्तर
F1 may be equal to F2.
Any force applied in the direction opposite the motion of the particle decelerates it to rest.
APPEARS IN
संबंधित प्रश्न
When a carpet is beaten with a stick, dust comes out of it. Explain.
The driver of a three-wheeler moving with a speed of 36 km/h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.
Name the scientist who gave the laws of motion.
Name the physical quantity whose unit is ‘newton’.
Find the acceleration produced by a force of 5 N acting on a mass of 10 kg.
Consider a book lying on a table. The weight of the book and the normal force by the table in the book are equal in magnitude and opposite in direction. Is this an example of Newton's third law?
A block of mass 10 kg is suspended from two light spring balances, as shown in the following figure.
Three rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles carrying charges 20 μC each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The magnitude of the resultant force on the charged particle at A is.
A particle stays at rest as seen in a frame. We can conclude that
(a) the frame is inertial
(b) resultant force on the particle is zero
(c) the frame may be inertial but the resultant force on the particle is zero
(d) the frame may be non-inertial but there is a non-zero resultant force
A block of mass 2 kg placed on a long frictionless horizontal table is pulled horizontally by a constant force F. It is found to move 10 m in the first seconds. Find the magnitude of F.
An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a frictionless horizontal table. The force required to keep this object moving with the same velocity is :
State Newton's first law of motion.
Explain the following :
After alighting from a moving bus , one has to run for some distance in the direction of bus in order to avoid falling .
A force of 600 dynes acts on a glass ball of mass 200 g for 12 s. If initially, the ball is at rest, find
- Final velocity
- Distance covered.
A man riding on a car has ___________ Inertia.
Give two examples of the following:
Inertia of rest
Name the scientist who first stated the law of inertia.
If the net force on an object is zero, what happens?
When does an object accelerate?
