Physical Science

Physical Science Practice Test #1 ____ 1. T F Scientific theories never change.

____ 2. T F A scientific law is a generalization about the behavior of nature from which there are only a few deviations noted after numerous observations or experiments.

____ 3. The base unit from which other metric measurements were devised was the a. liter b. meter c. hectogram d. centimeter

____ 4. The original meter was based on the distance a. between the North Pole and the equator b. equal to the Earth's circumference at the equator c. between the north and south poles of the Earth d. equal to the Earth's diameter at the equator

____ 5. In the metric system, smaller units of measure are created by

a. cutting the larger unit in half to get the next smaller unit of measure b. using the decimal system (breaking the unit into 10 equal parts to get the next smaller unit)

____ 6. Which one of the following prefixes is incorrectly matched with its meaning? a. kilo = one thousand b. centi = one hundred c. deci = one tenth d. milli = one thousandth

____ 7. 540 grams is equal to ______kilograms a. 54 b. 0.54 c. 540,000 d. .054

____ 8. If you have 5000 mls of water, you would have _____ liters of water. a. 50 b. 500 c. 5.0 d. 0.5

____ 9. 5.6 liters of water would be equal to _____ kilograms of water. a. 5.6 c. 560 b. 5,600 d. 0.0056

____ 10. A cubic liter would be a box which measures _____ centimeters on a side. a. 10 b. 100 c. 1 d. 1,000 ____ 11. If you were to fill a 1.0 liter container with water , the water would have a mass of a. 1,000 kilograms b. 1 kilogram c. 100 grams d. 100 kilograms

____ 12. If the length, width and height of a block is 2 cm x 2 cm x 4 cm and it has a mass of 16 grams, the block has a density of _____ grams per cubic centimeter. Remember, density is equal to mass per unit volume (g/cm3). a. 1 b. .1 c. .01 d. 10

____ 13. If a force of 100 Newtons is applied to a 10 kilogram mass, it would acceleratre at a rate of _____ m/sec2. (Force = ma, solve for the value of a in the equation.) a. 0.1 b. 10 c. 100 d. .01

____ 14. If the forces were applied to the pile of bricks as shown in the diagram below, in which direction and how quickly would it accelerate? (Solve for the force in the system and then use the formula to solve for the rate of acceleration.) a. 1 m/sec2 to the right b. 0.1 m/sec2 to the right 200 kg pile 2 c. 0.6 m/sec to the right 80 N of Bricks d. 0.4 m/sec2 to the left

____ 15. If a car were to accelerate from a speed of 38 ft/sec to a speed of 88 ft/sec in a period of 5 seconds, it would have an average acceleration of _____ ft/sec2. [Recall, acceleration is equal to change in speed (velocity) divided by time it takes to change the speed (velocity).] a. 17.6 c. 7.6 b. 0.1 d. 10 MATCHING 16 -19 Match the correct change in acceleration which would take place on the right when the changes listed on the left were made.

____ 16. Double the force while the mass remains constant A. the acceleration would become 4 times greater

____ 17. Double the force and at the same time double the amount of mass B. the acceleration would be cut in half

____ 18. Double the amount of mass while keeping the same amount of force C. the acceleration would double

____ 19. Cut the amount of mass in half while doubling the amount of force being D. the acceleration would remain the same applied

____ 20. T F According to the laws of physics, to maintain uniform speed in a constant direction (maintain uniform velocity) you must have a net force equal to zero acting on that object.

____ 21. If you apply a constant uniform unbalanced force on an object in a frictionless environment, the resultant motion would be a. uniform motion b. uniformly accelerated motion c. could be either uniformly accelerated or uniform depending on the size of the imbalanced force d. constant velocity

____ 22. T F When you carry a mass up a flight of stairs at a constant speed, you are doing work on that mass. ____ 23. T F If you carry a mass along a flat surface at a constant velocity, you are doing work on that mass. (Assume no friction on the system.)

____ 24. How much work would be required to lift a 20 kg mass to the top of a 100-meter high platform? a. 20,000 joules b. 2,000 joules c. 19,600 joules d. not enough information given to calculate the answer

____ 25. Assuming no friction, if the mass located at the top of the building to the right were to fall to the ground, its KE at the moment of impact with the ground would be equal to 1 a. 29,400 joules k g b. 3,000 joules 100 m c. 98 newtons high. d. 980 joules

____ 26. Note the position of the ball as it is falling as shown in the diagram to the right. Which of the following is true with regards to KE and PE? Release point a. the ball is now all KE with respect to the ground b. the PE of the ball is becoming larger while the KE is becoming smaller c. the PE of the ball is being converted into KE as it falls towards the ground ground d. the ball is still all PE with respect to the ground

____ 27. Assuming no friction, what is the value of the ball's PE with respect to the ground at its present position? a. 9,800 joules c. 100 joules b. 1,000 joules d. not enough information given in the diagram to calculate the answer

____ 28. Assuming no friction, what is the value of the ball's KE with respect to the ground at the ball's present position illustrated in the diagram to the right? a. 19,600 joules h = 1000 m b. 1,000 joules m = 1 kg c. 9800 joules d. not enough information given in the diagram to calculate the answer

____ 29. In the diagram below, assuming no friction in the system, if the ball is allowed to coast up the ramp, to what vertical height above the floor will the ball coast before it comes to a stop? a. 1.02 meters b. 10 meters 0 m/s c. 6 meters d. 5.1 meters h = 10 m

____ 30. If you lift a 100 kg mass a total of 20 vertical meters above the ground in 5 seconds, your power rating in watts would be (Remember, power is work/time.) a. 400 watts b. 3,920 watts c. 196,000 watts d. 20 watts

Match the term on the left with the units begin measured on the right. ____ 31. Joules A. work in English units

____ 32 Newtons B. power in Metric (SI) units

____ 33. Pounds C. pork in Metric (SI) units

____ 34. Joules/sec D. force in English units E. force in Metric (SI) units Match the units on the left with what is being measured on the right. ____ 35. m/sec A. force in (SI) units

____ 36. kg m/sec2 B. work in (SI) units

____ 37. m/sec2 C. speed in (SI) units

____ 38. kg m2/sec2 D. power in (SI) units

____ 39. Joules/sec E. acceleration in (SI) units

____ 40. Use the information in the diagram below to calculate the horizontal speed of the object as it left the table. (Assume no friction, calculate the time to fall the vertical distance and then use this time to figure the horizontal speed based on the horizontal distance traveled.) a. 4.9 m/sec m = 1 kg

b. 16.33 m/sec h= 1m c. 12.78 m/sec d. 7 m/sec

Match the category of wave on the left with the motion involved on the right.

____ 41. Longitudinal Wave A. particle motion is parallel with the direction of the energy motion ____ 42. Transverse Wave B. particle motion is either parallel or perpendicular with the direction of energy motion C. particle motion is perpendicular with the direction of energy motion

Match the characteristic of a wave on the left with the wave property on the right which determines that characteristic.

____ 43. Volume of sound A. dependent on the wavelength of the wave ____ 44. Pitch of sound B. dependent on the amplitude of the wave

____ 45. Speed of the sound wave C. not dependent on either the wavelength or amplitude of the wave

____ 46. In which case would you not hear the tone at a higher pitch that it is being emitted? a. two objects are approaching each other b. the object making the sound is moving towards you c. the object making the sound is stationary and you are moving toward that object d. the object making the sound is moving away from you