Review- 1Review- 1stst Six Weeks Six Weeks ExamExam

1. Identify the type of simple machines 1. Identify the type of simple machines pictured.pictured.

2. Describe what Newton’s First law 2. Describe what Newton’s First law means in your own words. means in your own words.

Give 2 examplesGive 2 examplesAn object at rest will stay at An object at rest will stay at

rest, an object in motion will rest, an object in motion will stay in motion unless an un-stay in motion unless an un-balanced force is acted on itbalanced force is acted on it

This law is often called "the law of inertia".

3. In this diagram, how could this 3. In this diagram, how could this person make the job easier?person make the job easier?

A lever set up this way has no A lever set up this way has no mechanical advantage. Whatever mechanical advantage. Whatever force is necessary to move the force is necessary to move the load is the force you must apply. load is the force you must apply.

The fulcrum is nearer the applied force. In a situation like this, you must apply much more force than the force of the load itself.

The fulcrum is placed close to the load, and this will let you move the load with just a small applied force.

4. Describe what Newton’s Third law 4. Describe what Newton’s Third law means in your own words. Give two means in your own words. Give two

examplesexamples

For every action there is an equal For every action there is an equal and opposite reaction.and opposite reaction.

5. In the picture, describe how 5. In the picture, describe how Newton’s Third Law applies.Newton’s Third Law applies.

As the girl jumps forward, the As the girl jumps forward, the boat is pushed backwards.boat is pushed backwards.

For every action there is an For every action there is an equal and opposite reaction.equal and opposite reaction.

6. In this picture, describe how 6. In this picture, describe how balanced and unbalanced forces may balanced and unbalanced forces may

apply.apply.

http://www.engineeringinteract.org/rhttp://www.engineeringinteract.org/resources/parkworldplot/flash/conceptesources/parkworldplot/flash/concepts/balancedandun.htms/balancedandun.htm

Click on link aboveClick on link above

Discuss the changes in energy that Discuss the changes in energy that take place in each of the pictures.take place in each of the pictures.

8. How does potential and kinetic 8. How does potential and kinetic energy relate to a roller coaster?energy relate to a roller coaster?

http://www.fossweb.com/modulesK-2/http://www.fossweb.com/modulesK-2/BalanceandMotion/activities/rollercoaBalanceandMotion/activities/rollercoaster.htmlster.html

9. The following tools can be used to 9. The following tools can be used to measure different quantities. Tell what measure different quantities. Tell what

each tool is used to measure:each tool is used to measure:

How to Read a Triple Beam How to Read a Triple Beam BalanceBalance

http://www.wisc-online.com/objects/ihttp://www.wisc-online.com/objects/index_tj.asp?objID=GCH202ndex_tj.asp?objID=GCH202

10. According to Newton’s Second 10. According to Newton’s Second Law, force is equal to mass times Law, force is equal to mass times acceleration. How does this law acceleration. How does this law

apply to a consumer purchasing an apply to a consumer purchasing an automobile who is concerned about automobile who is concerned about

gas mileage?gas mileage?

11. A 5kg ball accelerates 10m/s11. A 5kg ball accelerates 10m/s22 after being kicked. What force is after being kicked. What force is

applied to the ball?applied to the ball?

12.What is the net force needed to 12.What is the net force needed to accelerate a 20kg wagon at accelerate a 20kg wagon at

10m/s10m/s22??

20 x 10 = 200Newtons of force20 x 10 = 200Newtons of force

13. Label the effort (E), resistance 13. Label the effort (E), resistance (R), and/or fulcrum (F) in each of (R), and/or fulcrum (F) in each of

the simple machines below.the simple machines below.

14. What is the difference between 14. What is the difference between a balanced force and an a balanced force and an

unbalanced force?unbalanced force?

Balanced = No movementBalanced = No movement Unbalanced = movementUnbalanced = movement

•http://www.engineeringinteract.org/resources/parkworldplot/flash/concepts/balancedandun.htm

15-19. What type (s) of energy do 15-19. What type (s) of energy do the followings objects have:the followings objects have:

15) Vegetables15) Vegetables16) Light Bulb16) Light Bulb17) Camp Fire17) Camp Fire18) Flying Plane18) Flying Plane19) Battery19) Battery

20. Draw an example of a balanced 20. Draw an example of a balanced force: be sure to include Newton’s force: be sure to include Newton’s

and Net Forceand Net Force

21. Draw an example of an 21. Draw an example of an unbalanced force; be sure to unbalanced force; be sure to

include Newton’s and Net Forceinclude Newton’s and Net Force

22. In which diagram will it take the 22. In which diagram will it take the MOST force to raise the objectMOST force to raise the object

23. In which diagram will it take the 23. In which diagram will it take the LEAST force to raise the objectLEAST force to raise the object

24. A rock falls over a waterfall as 24. A rock falls over a waterfall as shown in the diagram. At which shown in the diagram. At which

point does the rock have the most point does the rock have the most potential energy? Explainpotential energy? Explain

Study Hard!!!!Study Hard!!!!

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