Question

Yah i got another question

a large crate is placed on the bed of a truck but is not tied down as the truck accelerates forward the crate slides across the bed until it hits the tailgate explain what causes this

i'm completley lost

Answer 1

And what does Newtons First Law say about this?

Answer 2

Inertia causes this to happen. As the truck slams on the brakes, the crate will continue to move in the direction the truck was moving.