# Review- 1 st Six Weeks Exam. 1. Identify the type of simple machines pictured.

## Presentation on theme: "Review- 1 st Six Weeks Exam. 1. Identify the type of simple machines pictured."— Presentation transcript:

Review- 1 st Six Weeks Exam

1. Identify the type of simple machines pictured.

2. Describe what Newton’s First law means in your own words. Give 2 examples  An object at rest will stay at rest, an object in motion will stay in motion unless an un- balanced force is acted on it This law is often called "the law of inertia".

3. In this diagram, how could this person make the job easier?  A lever set up this way has no mechanical advantage. Whatever force is necessary to move the 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 means in your own words. Give two examples  For every action there is an equal and opposite reaction.

5. In the picture, describe how Newton’s Third Law applies.  As the girl jumps forward, the boat is pushed backwards.  For every action there is an equal and opposite reaction.

6. In this picture, describe how balanced and unbalanced forces may apply.  http://www.engineeringinteract.org/r esources/parkworldplot/flash/concept s/balancedandun.htm http://www.engineeringinteract.org/r esources/parkworldplot/flash/concept s/balancedandun.htm http://www.engineeringinteract.org/r esources/parkworldplot/flash/concept s/balancedandun.htm  Click on link above

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

8. How does potential and kinetic energy relate to a roller coaster?  http://www.fossweb.com/modulesK- 2/BalanceandMotion/activities/rollerc oaster.html http://www.fossweb.com/modulesK- 2/BalanceandMotion/activities/rollerc oaster.html http://www.fossweb.com/modulesK- 2/BalanceandMotion/activities/rollerc oaster.html

9. The following tools can be used to measure different quantities. Tell what each tool is used to measure:

How to Read a Triple Beam Balance  http://www.wisc- online.com/objects/index_tj.asp?objI D=GCH202 http://www.wisc- online.com/objects/index_tj.asp?objI D=GCH202 http://www.wisc- online.com/objects/index_tj.asp?objI D=GCH202

10. According to Newton’s Second Law, force is equal to mass times acceleration. How does this law apply to a consumer purchasing an automobile who is concerned about gas mileage?

11. A 5kg ball accelerates 10m/s 2 after being kicked. What force is applied to the ball?

12.What is the net force needed to accelerate a 20kg wagon at 10m/s 2 ?  20 x 10 = 200Newtons of force

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

14. What is the difference between a balanced force and an unbalanced force?  Balanced = No movement  Unbalanced = movement http://www.engineeringinteract.org/resources/parkworldplot/flash/co ncepts/balancedandun.htmhttp://www.engineeringinteract.org/resources/parkworldplot/flash/co ncepts/balancedandun.htm

15-19. What type (s) of energy do the followings objects have:  15) Vegetables  16) Light Bulb  17) Camp Fire  18) Flying Plane  19) Battery

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

21. Draw an example of an unbalanced force; be sure to include Newton’s and Net Force

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

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

24. A rock falls over a waterfall as shown in the diagram. At which point does the rock have the most potential energy? Explain

Study Hard!!!!  Review can be found at:  www.kjpease.jimdo.com www.kjpease.jimdo.com  Under link for Powerpoints

Download ppt "Review- 1 st Six Weeks Exam. 1. Identify the type of simple machines pictured."

Similar presentations