Question

Can we get off a frictionless horizontal surface by jumping?

Answer 1

To answer this question, we first need to understand what friction is. Friction is the force that prevents solid surfaces, fluid layers, and material elements sliding against each other from moving in the same direction. Friction comes in a variety of forms: The force that opposes the relative lateral motion of two solid surfaces in contact is known as dry friction.

Complete step-by-step solution:
A human could only jump straight up on a smooth surface with no friction. Because there is no friction to push against him and keep him from sliding over, any force applied parallel to the surface will cause the person to slip. When all they can do is move up and down, no one will be able to move sideways.
What one could do is lie down on one's back and take a deep breath before standing up and leaping into the air (which is a very tough jump under frictionless conditions). When in the air, expel the air you inhaled previously, causing you to accelerate in the opposite direction. Because there is no friction when you land, you will maintain your momentum.
So, we conclude that because there is no friction when you land, you will maintain your motion and continue to glide. When all you can do is move up and down, you'll never be able to move sideways (and fall over).

Note: Friction is a helpful force because it keeps our shoes from slipping on the pavement and keeps car tyres from skidding on the road while we walk. When you walk, the tread on your shoes rubs against the ground, causing friction. This friction grips the ground and keeps you from sliding. We all desire to lessen friction from time to time.