2. Motion and Forces

3. Force A push or a pull *Cause an object to start moving, stop moving, or change direction

5. Unbalanced Force Cause an object to start moving, stop moving, or change directions Unbalanced forces will change an object’s motion

6. Unbalanced Forces Net Force = the overall force on an object after all the forces on an object are added up 1 2 1 3 1 2

7. Balanced Forces Equal forces acting on each other in opposite directions *Balanced forces acting on an object will not change the objects motion 1 0 1

8. An object at rest will remain at rest and an object that is moving at a constant velocity will remain at a constant velocity unless acted upon by an unbalanced force (Inertia)

9. Inertia Tendency of an object to resist change in its motion Ex. If you are not wearing a seat belt when a car crashes inertia continues to carry you forward

10. What affects Inertia? Mass the greater the mass the greater the inertia Question what has greater inertia a Honda Civic going 30 k/ph, or a Truck at the same speed?

11. ““Friction”” Is opposite resistance to an objects direction in motion Depends on 2 factors 1)The two surfaces involved 2)How hard are the surfaces pushing against each other

12. Types of Friction Sliding - solids over each other Rolling - when an object rolls over a surface F luid - objects moving through fluids (liquid or gases)

13. Weight vs. Mass Weight is a measure of the force of gravity on an object, mass is a measure of the amount of matter in an object You have the same mass on the Moon as Earth, but different weights

14. Gravity Gravity is a force between any two objects, the force of gravity is related to the mass of the objects, and their distance from each other

15. Force in Fluids Force is applied to a fluid causing pressure increase in a fluid The heart applies pressure to the blood forcing it through your vessels, blood flow in the body requires force