Physical Science 9 December Practice Exam

 

1        Describe an example of how you can or have used the scientific method in the lab or elsewhere in your life.  Use the language of the scientific method (observation, hypothesis, etc.) in your description.

2        Sketch the “Map of the Physical Universe.”

3        Convert to the stated units: 

a        13 mg to kg

b        2.11 cs to ms

c         36.4 mm to m

4        Give the following in decimal form:

a        5.2 × 10³

b        7.143 × 10^-5       

5        Give the following in scientific notation:

a        946000

b        0.0000365

6        A car drives north from the IC Norte. It starts at 12:30:00pm and ends up traveling 3.0 km distance by 12:33:00pm. What is the elapsed time? What is the car's final position? What is the displacement of the car from the IC? What is the car's velocity in m/s? What is the car's speed?

7        A skateboarder is traveling at 30 m/s eastward. She stops kicking so that her speed has cut to one third of its original value after 1.0 minute. What is the acceleration of the skater? (Remember direction. Acceleration is a vector.)

8        Use the equations of motion for freefall for the following: A ball drops from a building 10 m high. How long until it hits the ground? With what speed will it hit the ground?

9        Graph scenario 7 on a position vs time graph.

10    State any of Newton's Laws in your own words and explain it with an example.

11    Consider a 500 g ball hanging from a string. Draw the free body diagram for the ball labeling it with the types of forces and their values. Describe the reaction forces here.

12    Consider a 2000 kg car being towed along a flat road with constant speed and direction. If the cable towing the car is also horizontal and has a tension force of 200N, what will the force of friction be? If the cars hits a patch of oil and the force of friction reduces to 100N, what would the acceleration of the car be?

13    How much work is done on a 200g arrow by the bow if the tension in the bow applies a force of 100N on the arrow over a pull distance of 50cm?

a        How much work is done by the target if it applies a force of 1000N over a distance of 5.0cm in stopping the arrow?

b        What do you notice about these results?  Can you explain why?

14    Confirm the second part of question 8 using conservation of energy.

15    Tell the energy story for a blender operating in your kitchen here in Cbba (start at Corani), OR, eating a big lunch and then climbing San Pedro to the Cristo (start at the Sun).