what is 2 law of motin
Asked by shreyamishra270304 | 4th Aug, 2021, 08:32: AM
Newton's second Law of motion is expressed as follows :
The rate of change of momentum of a body is directly proportional to the applied force and
takes place in the direction in which the force acts .
Momentum of a body is product of mass and velocity
Let us assume a body of mass initially moving with velocity vi .
If a force F is acting on the body for a time Δt , then its momentum changes .
Let us assume velocity of body after applying force vf .
Change in momentum = m ( vf - vi )
Rate of change of momentum = [ m ( vf - vi ) ] / Δt
Then according to Newton's second law , force F = [ m ( vf - vi ) ] / Δt
Answered by Thiyagarajan K | 4th Aug, 2021, 08:59: AM
- establish Newton's first law from second law
- Water drops are falling in regular intervals of time from top of height 9m. If 4th drop begins to fall when 1st drop reaches the ground, find the positions of 2nd and 3rd drops from the tower.
- 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?
Kindly Sign up for a personalised experience
- Ask Study Doubts
- Sample Papers
- Past Year Papers
- Textbook Solutions
Verify mobile number
Enter the OTP sent to your number