Question

which force causes objects that are in contact with one another to resist motion?
gravitational force
mechanical energy
friction
newtons

Explanation:

• Gravitational force is the force of attraction between two masses. It is not related to resisting motion between objects in contact.
• Mechanical energy is the sum of kinetic and potential energy. It is not a force.
• Friction is a force that opposes the relative motion between two surfaces in contact.
• Newtons is the unit of force, not a type of force.

Answer:

C. friction