This week in science we learned about how weight can affect the amount of force a person/thing must put on an object. we know that if there is more weight the harder you have to pull on something. the less weight, the less force.
so we put 1 person on a cart and had 1 person pull, the cart was able to be pulled across the room very easily. then we put 2 on the cart and 1 person pulled. this became a little more struggling, but it was able to be pulled. lastly we put 3 people on the cart, now this was very hard for the person applying force on the cart, after 5 seconds of pulling the rope snapped. the same thing happened the next 3 times.
so these kind of things help us in real life because if ur trying to lift a 2 ton animal such as and elephant per say. you need to use a crane. this ties into the experiment when the more weight the more force.