Question

11. Which of the following forces is a contact force? *

A. Gravity
B. Friction
C. Magnetism
D. Electricity

Answer 1

B

Step-by-step explanation:

Friction is the force that you feel whenever you try to drag an object across a surface. Like a box along the floor, or your hand across a counter-top. It requires two objects to be in direct contact with each other (don't worry about air friction AKA "drag").

Answer 2

B

Step-by-step explanation:

Gravity is an invisible force, and so is magnetism and electricity. Friction involves the rubbing of things together to create energy.