Gravity is a type of _____ force.
contact
non-contact
magnetic
frictional
Gravity is a universal, non-contact force. Everything stays on the surface of the Earth due to its gravitational force.
(a) Define frictional force (or friction)
(b) Explain why frictional force is said to be a contact force.
(c) Explain why magnetic force is said to be a non-contact force.
Which of the following is a contact force: (a) electrostatic force (b) gravitational force (c) Frictional force (d) magnetic force.