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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?