Newton's Second Law

Q. Two particles of mass m1 and m2 in projectile motion have velocities v1 and v2 respectively at time t=0 . They collide at time t1 . Their velocities become v1 and v2 at time 2t1 while still moving in air. The value of |(m1v1+ m2v2)-(m1v1 + m2v2)|

Q.

A net force of 20N acts on a 5 kg mass kept at rest. Distance travelled by the mass in 6 s is

Q.

A bullet of mass 10gm strikes a fixed target and penetrates 8cm into it. If average resistance offered by the target to the bullet is 100N. What is the velocity with which the bullet hits the target?

I am really sorry, but this question is out of syllabus and I genuinely want the solution and that's why I put wrong chapter name.

Q.

Direction of impulse acting on a body is same as that of…

Q.

Give the relation between acceleration, mass, and force.

Q.

A body of mass $2kg$ is moving with a velocity of $12m/s$. Find the momentum of the body.

Q.

A force of 100N is applied on a body of mass 2kg at rest for 3 seconds. What will be velocity of the body after 10 seconds of application of the force assuming no friction?

1. 120 ms^-1

2. 170 ms^-1

3. 150 ms^-1

4. 100 ms^-1

5. 200 ms^-1

Q.

A cricket ball of mass $0.25kg$ with a speed of $10m/s$ collides with a bat and returns with the same speed within $0.01s$. The force acted on the bat is

1. $25N$

2. $50N$

3. $250N$

4. $500N$

Q.

A retarding force of 20 N is applied on a body of mass 2 kg moving at 150 m/s for 10 seconds. Calculate the velocity and the displacement of the body at the end of 10 seconds. What will the displacement of the body 5 seconds after the force is removed.

1. 5 ms^-1 , 1000 m, 25 m

2. 50 ms^-1 , 1000 m, 220 m

3. 50 ms^-1 , 500 m, 250 m

4. 50 ms^-1 , 1000 m, 200 m

5. 50 ms^-1 , 1000 m, 250 m

Q.

Velocity of a car of mass 2 tonnes is increased from 36 km/hr to 144km/hr in 10 seconds. Calculate the force applied by its engine. [ 1 tonne = 1000kg]

1. 2000 N

2. 4000 N

3. 6000 N

4. 10000 N

5. 8000 N

Q.

A body of mass 10 kg mass is moving with a velocity of 15 metre per second . When a adore is applied on it , its velocity becomes 30 metre per second after 10 sec. Calculate the applied force.

Q.

A block of mass 200 kg is accelerated uniformly from a velocity of 6 ${ms}^{-1}$​ to 8 ${ms}^{-1}$​ in 5 s. Calculate the initial momentum, final momentum and the magnitude of the force inserted on the block.

1. 1200 Ns, 1400 Ns, 50 N

2. 1200 Ns, 1600 Ns, 60 N

3. 1500 Ns, 1700 Ns, 40 N

4. 1200 Ns, 1600 Ns, 80 N

Q.

A force of 2 kgf is applied on a body of mass 98 kg. Calculate the acceleration of the body. [ g = 9.8 m/s² = 980 cm/s²]

1. 0.2 ms^-2

2. 0.1 ms^-2

3. 0.5 ms^-2

4. 0.4 ms^-2

5. 0.6 ms^-2

Q.

State the units of impulse of force in SI system?

Q. Mass times the rate of change of velocity of an object is equal to .

1. momentum
2. force
3. acceleration

Q.

The momentum of an object depends on its:

1. mass alone
2. velocity alone
3. distance
4. mass and velocity

Q.

Why does a gun recoil when a bullet is fired?

Q.

Mass of a body is tripled & velocity halved .Express new KE in terms of old KE.

1. 

2. 

3. 

4. 

5. 

Q. Which of the following is/are equal to the change in momentum of an object?

1. The product of force and time.
2. The product of mass and acceleration of the object.
3. The product of mass and velocity of the object.
4. The product of velocity and time.

Q.

While catching a fast-moving cricket ball, we pull our hands back why?, explain on the basis of Newtons Law of motion.

Q.

A boy of mass 50kg slides down a wooden plank 500cm high. Calculate the speed with which the boy will reach the ground.

1. 15 ms^-1

2. 10 ms^-1

3. 25 ms^-1

4. 30 ms^-1

5. 20 ms^-1

Q.

Velocity of a car of mass 2 tonnes is increased from 36 km/hr to 144km/hr and while doing so it covers 100m. Calculate the force applied by its engine.

1. 15000 N

2. 18000 N

3. 6000 N

4. 12000 N

5. 9000 N

Q. Question 5
A large truck and a car, both moving with a velocity of magnitude v, have a head-on collision and both of them come to a halt after that. If the collision lasts for 1 s:
(a) Which vehicle experiences the greater force of impact?
(b) Which vehicle experiences the greater change in momentum?
(c) Which vehicle experiences the greater acceleration?
(d) Why is the car likely to suffer more damage than the truck?

Q. Newton's second law of motion deals with the rate of change of with the force.

1. momentum
2. acceleration
3. distance

Q.

Mass of a body is increased by 16 times. What should be done to the velocity to maintain the same KE?

1. Velocity should be increased by 4 times

2. Velocity should be increased by 16 times

3. Velocity should be reduced to 1/4^th the original value

4. Velocity should be reduced to 1/16^th the original value

5. Velocity should be increased by 8 times

Q. A rifle bullet of mass $5\text{g}$ shot into a still target with a velocity of $150{\text{m s}}^{-1}$, comes to rest in the target after penetrating about $30\text{cm}$. What is the resistive force (in $\text{N}$) offered by the target to the bullet?

1. -187.5

Q. A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 ms1. The final velocity acquired by the person and the average force exerted on the person are

Q. A bullet of mass 10 g travelling horizontally with a velocity of 150 $m{s}^{-1}$ strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the magnitude of the force exerted by the wooden block on the bullet and the distance of penetration of the bullet into the block.

1. 30 N and 3.25 m
2. 50 N and 2.25 m
3. 50 N and 4.25 m
4. 60 N and 2.25 m

Q. Bullet Of 0.03kg mass each Hit a plate At The Rate Of 200 bullets Per second, with velocity of 50m/s and Reflect Back with a Velocity of 30m/s.find the Average force acting On The Plate

Q. State Newton’s second law.