**PHYSICS AND MEASUREMENT**

**I.Select the correct term to complete the sentences.**

**experiment**

**dependent**

**speed**

**time interval**

**metric system**

**length**

**natural laws**

**English system**

**mass**

**seconds**

**hypothesis**

**constant speed**

**atomic**

**1. It is believed all events in nature obey a set of ____ that do not**

**change.**

**2. _____ is the measure of the amount of matter in an object.**

**3. A(n) ____ can help you understand the natural laws that relate matter**

**and energy.**

**4. When you formulate a(n) ____, you make an educated guess or**

**prediction that can be tested by an experiment.**

**5. ____ properties are too small to be directly observed.**

**6. The ____ variable goes with the**

*y***-axis of a graph.**

**7. Distance is measured in units of ____.**

**8. A quantity of time is known as a(n) ____.**

**9. The ____ uses length measurements of millimeters, centimeters,**

**meters, and kilometers.**

**10. In physics, time is usually measured in units of ____.**

**11. The ____ uses length measurements of inches, feet, yards and miles.**

**12. ____ is the distance traveled divided by the time taken.**

**13. A car traveling the same distance every second is moving at ____.**

**CONCEPT BASED QUESTIONS :**

**1. List and define the two categories we use to classify everything in the**

**universe.**

**2. How have physicists come to understand the natural laws?**

**3. What property does matter have that energy does not?**

**4. Is light matter? Why or why not?**

**5. Define the term**

*system***as it relates to experiments.**

**6. When designing an experiment, how do you choose the system to**

**investigate?**

**7. Explain the main difference between the macroscopic scale and the**

**atomic scale.**

**8. List the steps of the scientific method.**

**9. A hypothesis is a random guess. True or false? Explain your answer.**

**10. What do you call variables that are kept the same in an experiment?**

**11. Why is it important to only change one experimental variable at a**

**time in an experiment?**

**12. You wish to do an experiment to determine how a ball’s radius affects**

**how fast it rolls down a ramp. List the independent and dependent**

**variables in this experiment.**

**13. Explain the role of energy in a system that is changing.**

**14. Why are units important when measuring quantities?**

**15. State whether you would measure each quantity in kilometers, meters,**

**centimeters, or millimeters.**

**a. The length of a car**

**b. A single grain of rice**

**c. The thickness of your textbook**

**d. The distance from your house to school**

**16. Why is it important to understand both English and metric units?**

**17. Give an example of a quantity that is often measured in metric units**

**and a quantity that is often measured in English units.**

**18. What are the two different meanings of the word time?**

**19. Summarize how to make a graph by listing the steps you would**

**follow.**

**20. You wish to make a graph of the height of the moon above the**

**horizon every 15 minutes between 9:00 p.m. and 3:00 am during one**

**night.**

**a. What is the independent variable?**

**b. What is the dependent variable?**

**c. On which axis should you graph each variable?**

**21. Write the form of the speed equation that you would use in each of the**

**following scenarios. Let**

*v***= speed,**

*t***= time, and**

*d***= distance:**

**a. You know distance and speed and want to find the time.**

**b. You know time and distance and want to find the speed.**

**c. You know speed and time and want to find the distance.**

**22. What is the speed of an object that is standing still?**

**23. Your friend rides her bicycle across town at a constant speed.**

**Describe how you could determine her speed.**