When the bus accelerates and moves forward, it acquires a state of motion. However, the luggage kept on the roof, owing to its inertia, tends to remain in its state of rest. Hence, with the forward movement of the bus, the luggage tends to remain at its original position and ultimately falls from thRead more
When the bus accelerates and moves forward, it acquires a state of motion.
However, the luggage kept on the roof, owing to its inertia, tends to remain in its
state of rest. Hence, with the forward movement of the bus, the luggage tends to
remain at its original position and ultimately falls from the roof of the bus. To
avoid this, it is advised to tie any luggage kept on the roof of a bus with a rope.
Inertia of an object tends to resist any change in its state of rest or state of motion. When a carpet is beaten with a stick, then the carpet comes to motion. But, the dust particles try to resist their state of rest. According to Newton's first law of motion, the dust particles stay in a state ofRead more
Inertia of an object tends to resist any change in its state of rest or state of motion.
When a carpet is beaten with a stick, then the carpet comes to motion. But, the
dust particles try to resist their state of rest. According to Newton’s first law of
motion, the dust particles stay in a state of rest, while the carpet moves. Hence,
the dust particles come out of the carpet.
Yes. Even when an object experiences a net zero external unbalanced force, it is possible that the object is travelling with a non-zero velocity. This is possible only when the object has been moving with a constant velocity in a particular direction. Then, there is no net unbalanced force applied oRead more
Yes. Even when an object experiences a net zero external unbalanced force, it is
possible that the object is travelling with a non-zero velocity. This is possible only
when the object has been moving with a constant velocity in a particular direction.
Then, there is no net unbalanced force applied on the body. The object will keep
moving with a non-zero velocity. To change the state of motion, a net non-zero
external unbalanced force must be applied on the object.
Mass of one of the objects, m₁ = 100 g = 0.1 kg Mass of the other object, m₂ = 200 g = 0.2 kg Velocity of m1 before collision, v₁ = 2 m/s Velocity of m2 before collision, v₂ = 1 m/s Velocity of m1 after collision, v₄ = 1.67 m/s Velocity of m2 after collision = v₄ According to the law of conservationRead more
Mass of one of the objects, m₁ = 100 g = 0.1 kg
Mass of the other object, m₂ = 200 g = 0.2 kg Velocity of m1 before collision, v₁ = 2 m/s
Velocity of m2 before collision, v₂ = 1 m/s
Velocity of m1 after collision, v₄ = 1.67 m/s
Velocity of m2 after collision = v₄
According to the law of conservation of momentum:
Total momentum before collision = Total momentum after collision
m₁v₁ + m₂v₂ = m₁v₃ + m₂v₄
⇒ 0.1×2 + 0.2×1 = 0.1×1.67 + 0.2×v₄
⇒ 0.4 = 0.67 + 0.2×v₄
⇒ v₄ = 1.165 m/s
Hence, the velocity of the second object becomes 1.165 m/s after the collision.
Mass of the rifle, m1 = 4 kg Mass of the bullet, m2 = 50g = 0.05 kg Recoil velocity of the rifle = v₁ Bullet is fired with an initial velocity, v₂ = 35 m/s Initially, the rifle is at rest. Thus, its initial velocity, v = 0 Total initial momentum of the rifle and bullet system = (m1 + m2) v = 0 TotalRead more
Mass of the rifle, m1 = 4 kg
Mass of the bullet, m2 = 50g = 0.05 kg
Recoil velocity of the rifle = v₁
Bullet is fired with an initial velocity, v₂ = 35 m/s
Initially, the rifle is at rest.
Thus, its initial velocity, v = 0
Total initial momentum of the rifle and bullet system = (m1 + m2) v = 0
Total momentum of the rifle and bullet system after firing:
= m₁ v₁ + m2v2 = 4(v1) + 0.05×35 = 4v1 + 1.75
According to the law of conservation of momentum:
Total momentum after the firing = Total momentum before the firing
4 v₁ + 1.75 = 0
⇒ v₁ = – 1.75/4 = – 0.4375 m/s
The negative sign indicates that the rifle recoils backwards with a velocity of 0.4375 m/s.
Why is it advised to tie any luggage kept on the roof of a bus with a rope?
When the bus accelerates and moves forward, it acquires a state of motion. However, the luggage kept on the roof, owing to its inertia, tends to remain in its state of rest. Hence, with the forward movement of the bus, the luggage tends to remain at its original position and ultimately falls from thRead more
When the bus accelerates and moves forward, it acquires a state of motion.
However, the luggage kept on the roof, owing to its inertia, tends to remain in its
state of rest. Hence, with the forward movement of the bus, the luggage tends to
remain at its original position and ultimately falls from the roof of the bus. To
avoid this, it is advised to tie any luggage kept on the roof of a bus with a rope.
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When a carpet is beaten with a stick, dust comes out of it. Explain.
Inertia of an object tends to resist any change in its state of rest or state of motion. When a carpet is beaten with a stick, then the carpet comes to motion. But, the dust particles try to resist their state of rest. According to Newton's first law of motion, the dust particles stay in a state ofRead more
Inertia of an object tends to resist any change in its state of rest or state of motion.
When a carpet is beaten with a stick, then the carpet comes to motion. But, the
dust particles try to resist their state of rest. According to Newton’s first law of
motion, the dust particles stay in a state of rest, while the carpet moves. Hence,
the dust particles come out of the carpet.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-9/
An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.
Yes. Even when an object experiences a net zero external unbalanced force, it is possible that the object is travelling with a non-zero velocity. This is possible only when the object has been moving with a constant velocity in a particular direction. Then, there is no net unbalanced force applied oRead more
Yes. Even when an object experiences a net zero external unbalanced force, it is
possible that the object is travelling with a non-zero velocity. This is possible only
when the object has been moving with a constant velocity in a particular direction.
Then, there is no net unbalanced force applied on the body. The object will keep
moving with a non-zero velocity. To change the state of motion, a net non-zero
external unbalanced force must be applied on the object.
For more answers visit to website:
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Two objects of masses 100 g and 200 g are moving along the same line and direction with velocities of 2 m s–1 and 1 m s–1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 m s–1. Determine the velocity of the second object.
Mass of one of the objects, m₁ = 100 g = 0.1 kg Mass of the other object, m₂ = 200 g = 0.2 kg Velocity of m1 before collision, v₁ = 2 m/s Velocity of m2 before collision, v₂ = 1 m/s Velocity of m1 after collision, v₄ = 1.67 m/s Velocity of m2 after collision = v₄ According to the law of conservationRead more
Mass of one of the objects, m₁ = 100 g = 0.1 kg
Mass of the other object, m₂ = 200 g = 0.2 kg Velocity of m1 before collision, v₁ = 2 m/s
Velocity of m2 before collision, v₂ = 1 m/s
Velocity of m1 after collision, v₄ = 1.67 m/s
Velocity of m2 after collision = v₄
According to the law of conservation of momentum:
Total momentum before collision = Total momentum after collision
m₁v₁ + m₂v₂ = m₁v₃ + m₂v₄
⇒ 0.1×2 + 0.2×1 = 0.1×1.67 + 0.2×v₄
⇒ 0.4 = 0.67 + 0.2×v₄
⇒ v₄ = 1.165 m/s
Hence, the velocity of the second object becomes 1.165 m/s after the collision.
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From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m s⁻¹. Calculate the initial recoil velocity of the rifle.
Mass of the rifle, m1 = 4 kg Mass of the bullet, m2 = 50g = 0.05 kg Recoil velocity of the rifle = v₁ Bullet is fired with an initial velocity, v₂ = 35 m/s Initially, the rifle is at rest. Thus, its initial velocity, v = 0 Total initial momentum of the rifle and bullet system = (m1 + m2) v = 0 TotalRead more
Mass of the rifle, m1 = 4 kg
Mass of the bullet, m2 = 50g = 0.05 kg
Recoil velocity of the rifle = v₁
Bullet is fired with an initial velocity, v₂ = 35 m/s
Initially, the rifle is at rest.
Thus, its initial velocity, v = 0
Total initial momentum of the rifle and bullet system = (m1 + m2) v = 0
Total momentum of the rifle and bullet system after firing:
= m₁ v₁ + m2v2 = 4(v1) + 0.05×35 = 4v1 + 1.75
According to the law of conservation of momentum:
Total momentum after the firing = Total momentum before the firing
4 v₁ + 1.75 = 0
⇒ v₁ = – 1.75/4 = – 0.4375 m/s
The negative sign indicates that the rifle recoils backwards with a velocity of 0.4375 m/s.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-9/