1. Motion
Chapter 11

2. Motion
_________ an objects change in position relative to a reference point
__________ a point or object used to describe a particular location
_____________ used to describe the motion of an object relative to the reference points around it
Example: Stand by a chair and use it as a _________ of reference. You can tell I have motion because my position around the chair _________

3. Distance
In order to describe _________ we need to be able to measure distance
Or how far an ______ moves
Distance can be measured in a _______ of units
What are some?
___________ distance between starting and ending point
__________ must always tell us which direction we are going

4. Speed Some objects move _______ than others
We _________ this by finding their speed
_______ how fast an object moves
Speed = Distance/Time (meters/second)
Speed does not take into account ________
If direction is needed then one must find velocity
__________= Distance/Time (speed of an object in a particular direction)

5. Velocity & Direction
Direction is described by using _____________-or from a particular point
North
______
East
West
Moving in the same direction is + moving in the __________ direction is –
Speed can only be + but velocity can be either
________________ may also be found by adding or subtracting velocities depending on their direction

6. Instantaneous Speed
You could find the ________ of anything at a given point in time by measuring their distance traveled in a smaller time ________
Meaning:
Instead of asking how fast did I drive on my way to work you would measure how fast you went from certain points that are closer together than home and work.

7. Graphing ________ can be graphed by using a _______ x Time graph
__ axis is time and __ axis and distance
_______ as a (x, y) point = (time, distance)
The ______ of the line is the speed of the ______
The greater the ______ the higher the speed
Straight lines on a graph __________ that an object is not moving

8. Acceleration ________ the change in velocity or direction over time
Meaning: how much you speed up or slow down in a given _______ of time
By changing direction you can “________” without actually changing speeds
Everything on earth has _________ because it is changing direction
Acceleration is + when ________up and – when slowing down

9. Calculating Acceleration

10. Graphing Acceleration
_______ time graph (x axis is time y axis is distance)
A _________ line on a speed vs. time graph means the speed changes by the same amount over a time ________
Acceleration is the ______ of the line

11. Motion & Force
_______ action exerted on a object in order to change the body’s state of rest or motion
_____________:
Electromagnetic (friction)
_________
Nuclear force

12. Fundamental Forces
Vary in ________ and the ________ over which they act
___________ strongest of the forces
Holds together protons and neutrons in the nucleus
___________ 2nd strongest found in friction
Holds together atoms (+ nucleus and – outer shells)
___________ the weakest of the forces
Used to keep us on the ground on earth

13. Contact vs. Field Forces
_____________
_____________
If you push on something it moves
If you catch a ball it goes from moving to a _________
A force that needs to have contact in order to _______
Do not require objects to come in contact
__________
Magnetic force

14. Forces Forces can be balanced or ___________
To move a _________ will you push in the same direction or opposite?
________= combination of all the forces acting on an object
The object will move in the _________ of the greatest force
Example……

15. Forces ___________ do not change motion meaning they are not moving
Unbalanced forces move in the _________ of the greatest force

16. Friction Force
_________ a force that opposes motion between two surfaces that are in contact
Match on a rough surface _______
Tires ________ with pavement cause a vehicle to slow down
Friction can cause heat
________ friction between two surfaces that are not moving
________ friction between moving surfaces
Rolling
Sliding (more friction than rolling)

17. Friction
Without _________ we would not be able to do many things we do today:
Drive a car
______
Fire
Friction can be lowered by using a ___________ that prevent direct contact between two services
Oil, ________, grease
To increase _________ surfaces can be made rough
Gravel or ______ on icy roads