मराठी

Why is it advantageous to turn before taking a long jump?

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प्रश्न

Why is it advantageous to turn before taking a long jump?

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उत्तर

It is advantageous to run before taking a long jump because after running we get motion of inertia which helps in long jumping

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पाठ 3: Laws of Motion - Exercise 3 [पृष्ठ १२९]

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फ्रँक Physics Part 1 [English] Class 9 ICSE
पाठ 3 Laws of Motion
Exercise 3 | Q 20 | पृष्ठ १२९

संबंधित प्रश्‍न

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.


An object is placed far away from all the objects that can exert force on it. A frame of reference is constructed by taking the origin and axes fixed in this object. Will the frame be necessarily inertial?


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


Let m1 = 1 kg, m2 = 2 kg and m3 = 3 kg in the following figure. Find the accelerations of m1, m2 and m3. The string from the upper pulley to m1 is 20 cm when the system is released from rest. How long will it take before m1 strikes the pulley?


A block is kept on the floor of an elevator at rest. The elevator starts descending with an acceleration of 12 m/s2. Find the displacement of the block during the first 0.2 s after the start. Take g = 10 m/s2.


Two balls A and B of masses m and 2 m are in motion with velocities 2v and v, respectively. Compare:

(i) Their inertia.

(ii) Their momentum.

(iii)  The force needed to stop them in the same time.


A bullet of mass 50 g moving with an initial velocity 100 m s-1 strikes a wooden block and comes to rest after penetrating a distance 2 cm in it. Calculate: (i) Initial momentum of the bullet, (ii) Final momentum of the bullet, (iii) Retardation caused by the wooden block and (iv) Resistive force exerted by the wooden block.


A motorcycle of mass 100 kg is running at 10 ms−1. If its engine develops an extra linear momentum of 2000 Ns, calculate the new velocity of a motorcycle.


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.


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


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