What type of force causes your car to move?

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

What is the angular momentum of the bar about the axle?