Why does in the second law of newton says that if you have more mass u have less aceleration?

Answer 1

think of it this way - 5 200 lb guys in a car lets say for instance can go 0-60 in 50 seconds. then you take a 150 lb guy in the same car can go 0-60 in 20 seconds. get it?

Answer 2

I assume you're referring to the equation F=ma, with force remaining constant.

Now think about it. Force is remaining constant. That means that when one variable on the other side of the equation gets larger, the other has to get smaller to keep it equal.

You can see this by plugging in some numbers. Say there's a force of 12 N and a mass of 4 kg.

12 = 4a

The acceleration obviously equals three m/(s^2). Now, if we increase the mass...

12 = 6a

The acceleration in this situation is less (2). This had to be the case for it to remain an equality. I hope that helped.

Answer 3

Only if force is constant. Since force=mass x acceleration, more mass means less acceleration.

Edit: let me explain that a bit more.
Say you apply the same force to a bowling ball (more mass) and a ping pong ball (less mass) ... the ping pong ball will have more acceleration with the same force.