As the sled is low on the ground then if the person was also that low
then it would be the same either front or back.
So as the person is higher than the sled ...
Being behind does push forward but also slightly down.
In front then the sled is pulled forward and also up slightly.
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It is usually more difficult to push a sled than to pull it because pushing requires overcoming both the friction between the sled and the ground, as well as the resistance caused by the weight of the sled. Pulling a sled allows the person to use more natural body mechanics and leverage to overcome these resistances.
Pushing a sled requires the individual to overcome static friction, which is typically higher than the kinetic friction when pulling the sled. Additionally, pushing a sled can cause the snow in front of the sled to compact, creating more resistance. Pulling a sled allows the person to use their body weight more effectively to generate traction.
A sled goes down a hill due to the force of gravity pulling it downward. As the hill is sloped, the force is stronger in that direction, causing the sled to slide downwards. Friction between the sled and the hill also helps to slow down the descent.
Friction is the force that keeps you from sliding off a sled when it starts moving. When you sit on a sled, the friction between the sled and your clothing provides the necessary grip to keep you in place as the sled accelerates.
A basic type of sled is called a toboggan.
The force that holds you to a sled when it starts moving is friction between your body and the sled, as well as the force of gravity acting on you downwards. As the sled accelerates, friction between your body and the sled helps keep you in place and in motion together.