1. Motion and Forces

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

3. Balanced and Unbalanced Forces

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

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

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

7. Newton’s 1st Law of Motion
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)

8. 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

9. 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?

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

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

12. 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

13. 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

14. 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