This video clip shows 7 demonstrations of Newton’s first law of motion–the law of inertia. Newton’s law of inertia states that objects moving at constant velocity will continue moving at constant velocity, unless acted upon by an outside unbalanced force. Six of these demonstrations (excluding demo 6) are from Tik Liem’s book Invitations to Science Inquiry. I have students volunteer to do all demos, except demo 5. All of the students in class receive a handout that they must fill in so that they understand how inertia is demonstrated and all the forces that are involved.