You see these two carts the first one is not moving because it has no Force and the second one is moving because it has Force. Force is The push or pull on an object with mass that causes it to change its velocity.
You see this man trying to move this car but you can't because it have too much mass. mass it is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force
Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing. Like this car for Example the car is going into a straight line and it will pick up speed if you keep on in a straight line.
you see these two rocks the one Right has a lot of mass and will not get down the hill In time the one on the left has last mass we'll have a lot of force to it and gain acceleration
You see these to karting one of them have nothing none of them have something One of them is hard to push one of them is not the one on the left hard to push because It has mass the one on the right is easier to push it because it has nothing