Can we get off a frictionless horizontal surface by jumping?

1.	Can we get off a frictionless horizontal surface by jumping?
Answer» On a frictionless surface, you would only be able to jump straight up. Any force applied parallel to the surface would cause you to slip as there is no friction to push against you and keep you from falling over. You can never make any sideways movement when all you can do is move up and down (and fall over). What you could do is lie on one's back and take a deep breath, then stand up (a very dificult jump indeed under frictionless conditions) and jump into the air. When one is in the air, blow out the air you previously took in...causing you to accelerate in the opposite direction. When you land, since there is no frictionl you will keep that motion and continue to slide.

Answer»

On a frictionless surface, you would only be able to jump straight up. Any force applied parallel to the surface would cause you to slip as there is no friction to push against you and keep you from falling over. You can never make any sideways movement when all you can do is move up and down (and fall over).

What you could do is lie on one's back and take a deep breath, then stand up (a very dificult jump indeed under frictionless conditions) and jump into the air. When one is in the air, blow out the air you previously took in...causing you to accelerate in the opposite direction. When you land, since there is no frictionl you will keep that motion and continue to slide.

Discussion

No Comment Found

Related InterviewSolutions

7. A body has a weight 50 N in air. Afterimmersing completely in liquid its weight is20 N. Then, the buoyant force on the bodywill be
Name the particulate which causes the disease mentioned below:(a)minamata (b)silicosis.
- Where does a body weight more at the surface of the carth or in a mine?
DelyAbody79entire chainthe ch.57. A body of mass 50gm collides elastically with anotherbody of mass 30 gm at rest. Then the percentage lossof the velocity of the colliding body during collision is1) 25% 2) 75% 3) 50% 4) 67%3) 120380.beide
What will be the acceleration of a body of mass5 kg if a force of 200 N is applied on it?
Rig. 5.168.13 Two bodles of masses 10 kg and 20 kg respectively kept on a smooth, hortzontalsurface are tied to the ends of a light string a horizontal force F 600 Nsapplied to lu A (t) B along the direction of string. What is the tension in thestring in each case
culate the gravitational force befween two protons kept at a distance67 x 10-27 kg. (1 femtometre = 10-15 m)
15. A uniform chain of length 2 m is kept on atable such that a length of 60 cm hangs freelyfrom the edge of the table. The total mass ofthe chain is 4 kg. What is the work done inpulling the entire chain onto the table ?(g = 10 m/s)1) 7.2J273.63) 120J4) 1200
Two block of mass 3 kg and 6 kg respectively are placed on a smooth 1.0 m/shorizontal surface. They are connected by a light spring of force 3 kgconstant k 200 N/m. Initially the spring is unstretched. The indicatedzmvelocities are imparted to the blocks. The maximum extension of thespring will be:A30 cm(C) 20 cm2.0 mls(B) 25 cm(D) 15 cm
88. A piece of stone is thrown vertically upwards. It reaches the maximum height in 3 seconds. If the accelerationof the stone be 9.8 m/s directed towards the ground, calculate the initial velocity of the stone with which itis thrown upwards.