Question

2. Which of the following is a contact force?
a gravitational force
electrostatic force
b. frictional force
d. magnetic force
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Answer 1

Answer:

Contact forces are those types of forces which result when the two interacting objects are perceived to be physically contacting each other. Examples of contact forces include frictional forces, tensional forces, normal forces, air resistance forces, and applied forces

Therefore, frictional force is the required answer

Answer 2

Answer:

option b : frictional force