False, Compounds can contain more than 2 elements.
Static friction - the friction that occurs when a force is being applied on a still object.
Sliding friction - the friction that occurs upon a moving object; it is always lower than the static friction of the same object.
Rolling friction - the friction on a rolling object; it is actually a form of static friction with the contact point of the wheel with the surface.
Answer:
6.39×10^23 kg is the weight on mass
1.022 km/s
Hope this helps~~~~~~~~
