Question

What are contact forces?

• A. Forces that need to be in contact with object in order to be effective
• B. Forces that do not need to be in contact with object in order to be effective
• C. Forces that may or may not be in contact with the object
  
• D. Forces that are in contact with the ground

Answer 1

The correct option is A

Forces that need to be in contact with object in order to be effective

Contact forces are forces that need to be in contact with the object for their effect. e.g. When you pull a box tied with the rope, you need to actually hold the rope and apply a pulling force on it. You cannot pull the box without touching the rope.