Hi, I'm Madame Princetta, and I love going shopping! Newton's first law is that an object at rest will remain at rest unless acted upon by a net force. In this situation, the shopping cart is the object and I am acting upon it by moving it! If I don't push the shopping cart, it won't move and will remain at rest.
Oh, no! My cart has so many things in it and it's so heavy. This makes it harder to push. While I push, I need to add more force! If I push harder (adding more force), then the cart will go faster! The acceleration of an object depends on how much force is applied to it. If an object has more mass, then there will be less acceleration, which means it needs more force. This is Newton's second law!
Hi! I'm Yeshiva Bochur, and I love to drive! But you have to be careful on the roads! This is because of inertia, the tendency of an object to resist a change in time! When a car short stops, you move forward a little and the seatbelt holds you back because the car stopped so fast. An object with more mass has more inertia!