CL-IX-PHYSICS H.W-9
Sl. No. Questions
1.
2. A car with a mass of 1200 kg accelerates at 5m/s 2. What is the force
required?
A force of 80 N is applied to an object with a mass of 8 kg. What is its
acceleration?
3. A car of mass 1000 kg is moving with a velocity of 70 m/s. What is its
momentum?
A cricket ball of mass 0.25 kg is moving with a velocity of 35 m/s. What
is its momentum?
A body of mass 50 kg is moving with a velocity of 6 m/s. If its velocity is
increased to 10 m/s, what is the change in momentum?
A hockey player applies a force of 40 N to a ball of mass 0.2 kg for 0.5s.
What is the change in momentum of the ball?
A vehicle of mass 2200 kg is moving with a velocity of 20 m/s. If its
velocity is decreased to 10 m/s, what is the change in momentum?
A force of 10 N acts on an object of mass 5 kg for 2 s. What is the
change in momentum of the object?
A car of mass 1200 kg is moving with a velocity of 25 m/s. If its velocity
is increased to 35 m/s, what is the change in momentum?
A force of 20 N acts on an object of mass 10 kg for 0.5 s. What is the
change in momentum of the object?
4. State Universal law of gravitation. Derive an expression for it.
5.
6. Why action and reaction forces don’t cancel out each other?
7. State Newton’s 3 laws of motion.
8. A car attains 74 km/h in 50 s after it starts. Find the acceleration of the car.
9. Give reasons:
Leaves fall down when a tree is shaken vigorously.
Passengers fall backwards when a train suddenly starts from rest.
Passengers fall outwards when a moving bus takes a sharp turn.
10. Define Inertia. What is its measure?
Sl. No. Questions
1.
2. A car with a mass of 1200 kg accelerates at 5m/s 2. What is the force
required?
A force of 80 N is applied to an object with a mass of 8 kg. What is its
acceleration?
3. A car of mass 1000 kg is moving with a velocity of 70 m/s. What is its
momentum?
A cricket ball of mass 0.25 kg is moving with a velocity of 35 m/s. What
is its momentum?
A body of mass 50 kg is moving with a velocity of 6 m/s. If its velocity is
increased to 10 m/s, what is the change in momentum?
A hockey player applies a force of 40 N to a ball of mass 0.2 kg for 0.5s.
What is the change in momentum of the ball?
A vehicle of mass 2200 kg is moving with a velocity of 20 m/s. If its
velocity is decreased to 10 m/s, what is the change in momentum?
A force of 10 N acts on an object of mass 5 kg for 2 s. What is the
change in momentum of the object?
A car of mass 1200 kg is moving with a velocity of 25 m/s. If its velocity
is increased to 35 m/s, what is the change in momentum?
A force of 20 N acts on an object of mass 10 kg for 0.5 s. What is the
change in momentum of the object?
4. State Universal law of gravitation. Derive an expression for it.
5.
6. Why action and reaction forces don’t cancel out each other?
7. State Newton’s 3 laws of motion.
8. A car attains 74 km/h in 50 s after it starts. Find the acceleration of the car.
9. Give reasons:
Leaves fall down when a tree is shaken vigorously.
Passengers fall backwards when a train suddenly starts from rest.
Passengers fall outwards when a moving bus takes a sharp turn.
10. Define Inertia. What is its measure?
