CBSE Class 11-science Physics Newton's Second Law Of Motion
- State Newton's second law of motion.
- What is SI unit of force? State it.
- What do you mean by momentum?
- What do you understand by weight or gravitational force.
- Explain why a stone thrown on a glass window smashes the window pane into pieces, but a bullet from the gun passes through making a clean hole.
- An object of mass 5 kg is acted upon by two perpendicular forces 8 N and 6 N. Give the magnitude and direction of the acceleration of the object?
- A man is driving a car with a speed of 36 km/hr (roughly 10 m/s). Suddenly a child appears in the middle of the road. He slams on the brakes, which in turn exerts a retarding force of 1000 N. The mass of the man and the car together is 500 kg. If the child is 27 metres away from the car when he first hit the brakes, will the child be saved?
- A 20 gram bullet moving with 200 m/s stops after penetrating a 2 cm of bone. Calculate the average force exerted by the bullet.
- Give the magnitude and direction of the net force acting on (a) a drop of rain falling down with a constant speed, (b) a cork of mass 10 g at rest (c) a kite skillfully held stationary in the sky, (d) a car moving with a constant velocity of 30 km/h on a rough road,
- A force of 60 dyne is inclined to the horizontal at an angle of 60°. Find the acceleration in a mass of 6 g, which moves in the horizontal direction.
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