A body needs a force F1 just to start motion on a surface, a force F2

1.	A body needs a force F1 just to start motion on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is 1. the static friction 2. sliding friction and 3. rolling friction ? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.
Answer» 1. F₁ = Static friction 2. F₂ = Sliding friction 3. F₃= Rolling friction F₁ > F₂ > F₃ F₂ is less than F₁ but greater than F₃.

A body needs a force F1 just to start motion on a surface, a force F2 to continue its motion and a force F3 to roll on the surface. What is 1. the static friction 2. sliding friction and 3. rolling friction ? State whether F2 is equal, less than or greater than (1) F1 and (2) F3.

Answer»

1. F₁ = Static friction

2. F₂ = Sliding friction

3. F₃= Rolling friction

F₁ > F₂ > F₃

F₂ is less than F₁ but greater than F₃.