PHYSICS BASELINE
Name: _______________________________ Grade:________________________ Block____ Date: ________________________________ Section I. Answer all questions. Circle the best answer from the answers provided for each question. Show all working. 1. What is 2,500 milliliters converted to liters? A. 25 B. 2.5 C. 250 D. 0.25 2. The mass of a fruit fly is only about 2.0 x 10-­‐7 of a kilogram. What is this number written in standard form? A. 0.000002 B. 0.0000002 C. 2,000,000 D. 20,000,000 3. What is the best estimation, in square centimeters, for the surface area on the rectangular prism shown to the right? Surface area = 2wl + 2lh + 2wh A. 14 B. 45 C. 48 D. 53 5.2 cm 2.1 cm 2.1 cm 4. Which tool is the most appropriate for measuring the height of a person? A. meterstick B. thermometer C. graduated cylinder D. triple beam balance 5. To raise money for Cancer Awareness, Terry climbs 1576 steps in the Empire State Building in New York City. If it takes 35 minutes to complete the climb, what is Terry’s average speed in steps per minute? If each step has an height of ~0.20 m, what is Terry’s average speed in meters per second? Show your work. Answer:_________________ steps/min. Answer:_________________ m/s. Section II. Answer all questions. Circle the best answer from the answers provided for each question. Show all working. 1. Use the grid to graph the data on the left. Please label your work. Distance Time (s) 2 1.5 4 3 6 4.5 8 6 10 7.5 12 9 12 10.5 12 11.5 12 13 a. On this graph, what is the independent variable? _________________________________ b. What is the dependent variable? _______________________________________________ c. Describe the relationship between distance and time as demonstrated by the graph. d. Give a reason for this relationship (hypothesis). 2. Solve for c: Pythagoras’ theorem: c2 = a2 + b2 Show your work. c 9 m θ
12 m Answer:_________________ m. 3. Two teenagers on skateboards push off of each other. The first girl who is 145 pounds, and ends up traveling a speed of 2.5 m/s after the push. The second teenager ends up going 3.5 m/s. What is his mass? (Ignore Friction) (Hint :1 kg = 2.205 lbs) Show your work. Answer:_________________ kg. Section III. Answer all questions 1. Solve the equation below for the indicated variable. F •d =
1
1
m • v 2f − m • v i2
2
2
solve
for vi €
2. Solve the equation below for the indicated variable. Fg =
G • m1 • m2
r2
solve for
€
m2
3. What is the gravitational field strength in (N/kg) of the moon if it is 4.06 x 108 m from Earth? (The mass of the Earth is 5.97 x1024 kg) (Hint: Fg =
G • mE • mm
, G =6.67 x10-­‐11 N • m2/kg2 , Fg = mm • g) 2
r
Answer:_________________N/ kg. 4. What if the moon was closer to Earth, say it had a radial distance from the Earth of 3.84 x 108 m, What would it’s gravitational field strength be? Answer:_________________N/ kg. 5. How much force is needed to accelerate a 25 kg object at 3 m/s2 ? Note : 1N = 1 kg m/s2 Answer:_________________ N. 6. A pendulum has a length of 2 m, what is its period if we are on Earth? Note: g = 9.81 m/s2 on Earth. T = 2π
L
g
Answer:_________________ s.