1. CHAPTER 8 REVIEW MS. PAREKH

2. WHAT IS A REFERENCE POINT? IT IS THE STARTING POINT USED TO LOCATE ANOTHER PLACE OR THING

3. WHAT IS POSITION? DESCRIBES AN OBJECT’S DISTANCE AND DIRECTION FROM A REFERENCE POINT.

4. WHAT IS DISPLACEMENT? IS THE DIFFERENCE BETWEEN THE INITIAL, OR STARTING, POSITION AND THE FINAL POSITION.

5. TRUE OR FALSE: DISPLACEMENT AND DISTANCE ARE ALWAYS EQUAL FALSE

6. WHAT ARE THE DISTANCE AND DISPLACEMENT? IF THE GIRL RUNS FROM POSITION D TO POSITION C AND THEN TO POSITION B, THE DISTANCE SHE RUNS IS 51.2 M. HER DISPLACEMENT IS 40 M.

7. WHAT IS MOTION? THE PROCESS OF CHANGING POSITION

8. WHY DOES THE DESCRIPTION OF AN OBJECT’S MOTION DEPEND ON A REFERENCE POINT? POSITION DEPENDS ON A REFERENCE POINT. SO IN ORDER TO SEE IF THERE IS A CHANGE IN POSITION A REFERENCE POINT IS NEEDED.

9. WHAT IS SPEED (3 TYPES)? CONSTANT SPEED? IS THE DISTANCE AN OBJECT MOVES IN A UNIT OF TIME. CONSTANT, CHANGING, AVERAGE WHEN AN OBJECT MOVES THE SAME DISTANCE OVER A GIVEN UNIT OF TIME, IT IS SAID TO HAVE A CONSTANT SPEED.

10. WHAT IS CHANGING SPEED? WHEN THE DISTANCE AN OBJECT COVERS INCREASES OR DECREASES OVER A GIVEN UNIT OF TIME, THE OBJECT IS SAID TO BE CHANGING SPEED.

11. WHAT IS AVERAGE SPEED?

12. WHAT IS VELOCITY? IS THE SPEED AND THE DIRECTION OF A MOVING OBJECT. HOW ARE SPEED AND VELOCITY DIFFERENT? SPEED IS DISTANCE COVERED OVER TIME. VELOCITY IS SPEED AND DIRECTION

13. WHEN DOES VELOCITY CHANGE? WHEN SPEED AND/OR DIRECTION CHANGE

14. WHAT IS ACCELERATION? IS A MEASURE OF HOW QUICKLY THE VELOCITY OF AN OBJECT CHANGES WHAT ARE THE TWO KINDS OF ACCELERATION? DEFINE THEM POSITIVE ACCELERATION: SPEEDING UP NEGATIVE ACCELERATION: SLOWING DOWN

15. WHAT ARE THREE WAYS ACCELERATION CREATED? SPEEDING UP, SLOWING DOWN AND CHANGING DIRECTION

16. WHAT IS A DISTANCE-TIME GRAPH? A GRAPH THAT SHOWS HOW DISTANCE AND TIME ARE RELATED WHAT GOES ON THE X-AXIS? TIME Y-AXIS? DISTANCE

17. BE ABLE TO GRAPH

18. HOW IS CONSTANT SPEED DEPICTED ON A GRAPH? WITH A STRAIGHT LINE

19. WHAT IS A SPEED-TIME GRAPH? SHOWS THE SPEED OF AN OBJECT ON THE Y-AXIS AND TIME ON THE X-AXIS.

20. WHAT DOES THE GRAPH SHOW? THE SPEED- TIME GRAPH FOR AN OBJECT AT REST IS A HORIZONTAL LINE AT Y = 0.

21. WHAT DOES THE POSITIVE ACCELERATION GRAPH LOOK LIKE?

22. WHAT DOES THE GRAPH FOR NEGATIVE ACCELERATION LOOK LIKE?

23. WHAT IS A FORCE? A PUSH OR A PULL ON AN OBJECT HOW IS A FORCE DIFFERENT FROM VELOCITY? A FORCE HAS SIZE AND DIRECTION WHILE VELOCITY HAS SPEED AND DIRECTION

24. WHAT IS A CONTACT FORCE? A NONCONTACT FORCE? IS A PUSH OR A PULL ON ONE OBJECT BY ANOTHER OBJECT THAT IS TOUCHING IT. A FORCE THAT ONE OBJECT CAN APPLY TO ANOTHER OBJECT WITHOUT TOUCHING

25. WHAT IS GRAVITY? IS AN ATTRACTIVE FORCE THAT EXISTS BETWEEN ALL OBJECTS THAT HAVE MASS WHAT DOES GRAVITY DEPEND ON? MASS AND DISTANCE

26. HOW DOES DISTANCE INFLUENCE GRAVITY? MASS? THE SHORTER THE DISTANCE THE GREATER THE GRAVITATIONAL ATTRACTION THE GREATER THE MASS THE GREATER THE GRAVITATIONAL ATTRACTION

27. WHAT IS THE DIFFERENCE BETWEEN WEIGHT AND MASS? MASS IS THE AMOUNT OF MATTER IN AN OBJECT WEIGHT IS A MEASURE OF THE GRAVITATIONAL FORCE ACTING ON AN OBJECT’S MASS.

28. WHAT IS FRICTION? IS A CONTACT FORCE THAT RESISTS THE SLIDING MOTION OF TWO SURFACES THAT ARE TOUCHING.

29. WHAT IS AIR RESISTANCE? IS THE FRICTIONAL FORCE BETWEEN AIR AND OBJECTS MOVING THROUGH IT.

30. WHAT IS NET FORCE? THE SUM OF ALL FORCES ACTING ON AN OBJECT CAN BE BALANCED OR UNBALANCED

31. WHAT IS NEWTON’S FIRST LAW? IF THE NET FORCE ACTING ON AN OBJECT IS ZERO, THE MOTION OF THE OBJECT DOES NOT CHANGE

32. WHAT IS NEWTON’S SECOND LAW? THE ACCELERATION OF AN OBJECT IS EQUAL TO THE NET FORCE EXERTED ON THE OBJECT DIVIDED BY THE OBJECT’S MASS.

33. WHAT IS NEWTON’S THIRD LAW? THAT FOR EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION.