Newton's Second Law
Trending Questions
Q. Bullets of 0.03 kg mass each hit a plate at the rate of 200 bullets per second, with a velocity of 50 m/s and reflect back with a velocity of 30 m/s. Find average force acting on the plate.
Q. Two paper screens A and B are separated by 100 m distance . A bullet pierces A and then B . The hole in B is 10 cm below the hole in A. If the bullet is travelling horizontally at A, calculate the velocity of the bullet at A. (Neglecting the types of frictional forces ):
(1) 980 m/s
(2) 500 m/s
(3) 700 m/s
(4) 490 m/s
Q. As mass of a body increases, the inertia of the body __________.
- remains same
- decreases
- increases
- remains zero
Q. A boy of mass 50 kg jumps with a horizontal velocity of 1 m/s on to a stationary cart. If the mass of cart is 5 kg, then the velocity of the boy is (Assuming the friction between the wheels of cart and road is zero)
Q. Which of the following statement(s) is correct?
- If a body is in motion, then no force is acting on it.
- If the acceleration of a body is zero, then the body is at rest.
- If a body is at rest, there must be some non-zero force to keep it at rest.
- If a body remains at rest, then the net force acting on it must be zero.
Q. State the relation between force and acceleration.
How much force acts on a body whose momentum remains constant.
How much force acts on a body whose momentum remains constant.
Q. For how much time should a force of 200 act on object having mass 5 kg so as to increase velocity from 50m/sec to 100m/sec
Q. Two blocks of mass 5 kg and 7 kg are placed in contact with each other on a frictionless horizontal surface. If we apply a push of 6 N as shown in the figure, then the force exerted by 7 kg mass on 5 kg mass will be
- 2.5 N
- 1.1 N
- 4 N
- 3 N
Q. A block of mass m and length l and height h is kept at rest on a rough inclined plane of inclination Alpha with the horizontal as shown .if new is the coefficient of friction between the block and the inclined plane then the block topples over if
Q. { A body of mass }40gm is moving with a constant }}{ velocity of }2cm/sec on a horizontal frictionless }} table. The force on table is
Q. A block of mass 2.0 kg is kept over another block of mass 3.0 kg, kept on a smooth horizontal surface. Coefficient of friction between two blocks is 1.0. If a horizontal force F = 25 N is applied horizontally on 2.0 kg block as shown in the figure, then frictional force between two blocks is (g = 10 m s–2)
Q.
Two balls of the same size but of different materials, rubber and iron are kept on the smooth floor of a moving train. The brakes are applied suddenly to stop the train. Will the balls start rolling? If so, in which direction? Will they move with the same speed? Give reasons for your answer.
Can you name the three types of inertia? [5 MARKS]
Q.
A body starts from rest and moves with constant acceleration. The ratio of distance covered by the body in the nth second to that covered in n seconds is:
Q. Momentum is a quantity, as it depends upon the of velocity of object.
- vector
- scalar
- magnitude
- direction
Q. Momentum is a quantity, as it depends upon the of velocity of object.
- vector
- scalar
- magnitude
- direction
Q. State the relation between force and acceleration.
How much force acts on a body whose momentum remains constant.
How much force acts on a body whose momentum remains constant.
Q. An Atwood machine is set up like the figure below. If m1=5.0kg and m2=15kg. What is the tension in the rope?
Take the value of g=10ms−2
Take the value of g=10ms−2
Q. What is the correct form of Newton’s second law of motion?
- F=m(v2−v1)/(t2−t1)
- F=m(p2−p1)/(t2−t1)
- F=m(p2+p1)/(t2−t1)
- F=mv
Q.
A force of 20 N acts on a body of mass 4 kg for 5 s when it is initially at rest. Calculate the velocity acquired by the body and change in momentum of the body. [3 MARKS]
Q. Three identical blocks, each of mass 10 kg, are pulled as shown on the horizontal frictionless surface. If the tension (F) in the rope is 30N. What is the acceleration of each block? And what are the tensions in the other ropes?
Q. Choose the correct statements regarding momentum.
Statement 1: Momentum has both direction and magnitude.
Statement 2: SI unit of momentum is kgms−1.
Statement 3: A balanced force can create a change in velocity.
Statement 4: An unbalanced force can create a change in velocity.
Statement 5: A balanced force can create a change in momentum.
Statement 6: A unbalanced force can create a change in momentum.
Statement 1: Momentum has both direction and magnitude.
Statement 2: SI unit of momentum is kgms−1.
Statement 3: A balanced force can create a change in velocity.
Statement 4: An unbalanced force can create a change in velocity.
Statement 5: A balanced force can create a change in momentum.
Statement 6: A unbalanced force can create a change in momentum.
- All statements, except 5
- All statements except 5 and 3
- All statements except 1
- All statements except 2
Q. A water tanker filled up to two-thirds of its height is moving at a uniform speed. On sudden application of the brake, the water in the tank will .
- move forward
- move backward
- remain unaffected
Q. A bullet of mass 50g moving with an initial velocity of 100 m s-1 , strikes a wooden block and comes to rest after penetrating a distance 2cm in it . Calculate
1. Initial momentum of the bullet.
2. Final momentum of the bullet.
3. Retardation caused by the wooden block.
4. Resistive force exerted by the wooden block.
1. Initial momentum of the bullet.
2. Final momentum of the bullet.
3. Retardation caused by the wooden block.
4. Resistive force exerted by the wooden block.
Q. A block of mass 3 kg slides on a fixed rough inclined plane of angle of inclination 53 the force of friction on block? Us= 0.3 Uk= 0.2 between block and inclined surface
Q.
A bus starts from rest and rolls down a hill with a constant acceleration. The weight of the bus is 6.8 tonnes and it has luggage of 200 kg tied with a rope on its top. The weight of the driver and the rope is negligible. (ii) Why is the luggage kept on the roof of the bus tied with a rope? |
Q. Choose the correct statements regarding momentum.
Statement 1: Momentum has both direction and magnitude.
Statement 2: SI unit of momentum is kgms−1.
Statement 3: A balanced force can create a change in velocity.
Statement 4: An unbalanced force can create a change in velocity.
Statement 5: A balanced force can create a change in momentum.
Statement 6: A unbalanced force can create a change in momentum.
Statement 1: Momentum has both direction and magnitude.
Statement 2: SI unit of momentum is kgms−1.
Statement 3: A balanced force can create a change in velocity.
Statement 4: An unbalanced force can create a change in velocity.
Statement 5: A balanced force can create a change in momentum.
Statement 6: A unbalanced force can create a change in momentum.
- All statements, except 5
- All statements except 5 and 3
- All statements except 1
- All statements except 2
Q. State the relation between force and acceleration.
How much force acts on a body whose momentum remains constant.
How much force acts on a body whose momentum remains constant.