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Transcript
Physical Science Unit 2 Forces Name ____________________________ Date _____________ Hour __________ Practice Assessment Fill in the blank ________________________1. Forces that are opposite and equal are called ________________________2. The force that opposes the motion of an object is called ________________________3. The type of friction that exists for a shark swimming in the ocean is ________________________4. The property of matter that resists a change in motion is ________________________5. According to Newton’s 2nd law of motion, force equals mass times ________________________6. The force of attraction that exists between all objects in the universe is ________________________7. In a vacuum tube (glass tube with air sucked out), what falls faster, a penny or a feather? ________________________8. In our classroom, a penny falls faster than a sheet of paper because ________________________9. On the planet Zorb, objects fall at 20 meters/second/second. Is it more or less massive than earth? Would you have more or less mass there? Would you have more or less weight there? Give a few examples of objects experiencing these types of friction A. Sliding Friction B. Rolling Friction C. Fluid Friction ________________________10. Forces can cause objects to …move? Stop? Change direction? In the space at the left, write in the word or number that best fills in the blank ____________________11. A force that sets an object into motion is ____________________12. A push or pull is called a(an) ___. ____________________13. On the Earth, the numerical value for the acceleration due to gravity is ___. ____________________14. The kind of friction experienced by a bird in flight is ___friction. ____________________15. Forces that are equal in size and opposite in direction are described as ___forces. ____________________16. Forces that cause changes in motion are described as ___ forces. _____________________17. The laws of motion were developed by the scientist ___. ____________________18. An object in motion would continue to move forever if it were not for the presence of ___. ____________________19. Newton’s first law of motion deals w/ the property of matter that resists changes in motion, or ___. ____________________20. Everyone in the world is attracted to me because we all have ___. USE COMPLETE SENTENCES TO ANSWER THESE SHORT ANSWER QUESTIONS!!!! 21-24 (3 pts.) Use Newton’s first law to explain why seatbelts are necessary in a car even though it has brakes. 25-28 (3 pts.) Explain how and what Galileo determined in his famous experiment on the Leaning Tower of Pisa. 29-32 (3 pts.) Use an aspect of Newton’s Laws to explain why a large car gets less mileage than a small car from the same quantity of gas when both cars have the same acceleration 33-36 (3 pts.) Think of the space ship at the computer lab. Consider Newton’s 2nd and 3rd Laws. If you were an astronaut floating untethered (not tied) outside the space shuttle, and you threw a 20 lb. bowling ball out into space, describe the motion (speed and direction) of both you and the ball. Use the laws to justify why. 37-40 (3 pts.) Describe the motion of the ball and you one hour later (justify why using the laws). Be able to show work… A. What is the mass of an object that weighs 500 newtons on the planet Zorb (see #9) B. If Billy Bob weighs 2000 newtons and his mass is 100 kg, how much gravity is there where he is? Is this place bigger or smaller than earth? By how approx. how much?