English

Use Newton's second law to explain the following:We always prefer to land on sand instead of hard floor while taking a high jump.

Advertisements
Advertisements

Question

Use Newton's second law to explain the following:
We always prefer to land on sand instead of hard floor while taking a high jump.

Short/Brief Note
Advertisements

Solution

We always prefer to land on sand instead of hard floor while taking a high jump because sand increases the time of contact.
As FX t = m ( v - u ) and our change in momentum is constant so if time increases then force experienced would decrease.

shaalaa.com
  Is there an error in this question or solution?
Chapter 3: Laws of Motion - Exercise 3 [Page 131]

APPEARS IN

Frank Physics Part 1 [English] Class 9 ICSE
Chapter 3 Laws of Motion
Exercise 3 | Q 65.1 | Page 131

RELATED QUESTIONS

A body of mass 0.40 kg moving initially with a constant speed of 10 m s–1 to the north is subject to a constant force of 8.0 N directed towards the south for 30 s. Take the instant the force is applied to be t = 0, the position of the body at that time to be x = 0, and predict its position at t = –5 s, 25 s, 100 s.


A person says that he measured the acceleration of a particle to be non-zero even though no force was acting on the particle.


An aeroplane is moving uniformly at a constant height under the action of two forces (i) Upward force (lift) and (ii) Downward force (weight). What is the net force on the aeroplane?


Show that the rate of change of momentum = mass × acceleration. Under what condition does this relation hold?


Two bodies A and B of same mass are moving with velocities v and 2v, respectively. Compare their (i) inertia and (ii) momentum.


Use Newton's second law of motion to explain the following instance :
An athlete prefers to land on sand instead of hard floor while taking a high jump .


Calculate the velocity of a body of mass 0.5 kg, when it has a linear momentum of 5 Ns.


A stone is dropped from a cliff 98 m high.
How long will it take to fall to the foot of the cliff?


Why does a child feel more pain when she falls down on a hard cement floor, than when she falls on the soft muddy ground in the garden?


Newton’s Second Law corrected the old belief that force is needed to maintain motion. This idea came from the philosopher ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×