Why are seat belts important and how do they to Newton's law of motion?

If seatbelts are not used, there is a high risk of injury if you were to get into a wreck because if there is no force acting on your body then you will continue moving even after the car has stopped. Newton's first law of motion states that an object will remain at rest unless compelled to change its state by the action of an external force. This law is also referred to as the law of inertia.

hope this helps you :)

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

the independent variable, or the one that is intentionally manipulated is the speed.