Completion Complete each
statement.
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1.
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A machine that uses only one movement is a(n) ____________________.
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2.
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An object is accelerating if its ____________________ or____________________
changes.
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3.
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In a machine, the effort force you apply is used to overcome a
____________________ force.
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4.
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The speed of an object and its direction of motion are its
____________________.
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5.
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The speed of an object at any instant in time is its ____________________
speed.
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6.
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The less mass a moving object has, the ____________________ it is to stop
it.
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7.
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Force pairs act on ____________________ object(s).
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8.
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A spring scale is used to measure ____________________.
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9.
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Machines can change the size of the force you apply, and/or change the
____________________ of the force.
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10.
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Friction always ____________________ an object.
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11.
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The smoother a surface is, the ____________________ the force of
friction.
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12.
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According to Newton’s second law, an object acted on by a net force will
accelerate in the direction of ____________________.
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13.
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If a person pushes on a wall with a force of 35 N, the force acting on the
person is ____________________.
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14.
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To do work, a(n) ____________________ must be applied and the object must
move.
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A ball dropped from a height of 125 m takes 5 s to hit the ground and is
traveling at the rate of 50 m/s when it hits.
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15.
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The average speed of the ball in meters per second is
____________________.
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16.
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The ball’s acceleration is ____________________.
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17.
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After 3 seconds, the ball travels at a rate of ____________________.
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18.
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After 4 seconds, the ball has traveled a distance of
____________________.
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Multiple Choice Identify the
choice that best completes the statement or answers the question.
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19.
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It would probably be easiest to ride a bicycle across ____.
a. | a sidewalk | c. | sand | b. | the grass | d. | gravel |
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20.
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The force that always acts opposite to the direction of the motion of an object
is called ____.
a. | gravity | c. | friction | b. | inertia | d. | none of these |
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21.
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According to Newton’s third law, forces always occur in ____ pairs.
a. | equal but opposite | c. | unequal but complementary | b. | unequal but
opposite | d. | equal but
complementary |
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22.
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Newton first described gravity while watching ____.
a. | smoke rise | c. | someone walking | b. | a car accelerate | d. | an apple
falling |
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23.
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You would NOT use ____ to find the acceleration of an object.
a. | time | c. | final speed | b. | initial speed | d. | weight |
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24.
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Newton’s ____ law of motion explains why you may lean sideways in a car if
the driver turns a corner too quickly.
a. | primary | c. | second | b. | first | d. | third |
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25.
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____ is the speed of an object and its direction of motion.
a. | Friction | c. | Gravity | b. | Mass | d. | Velocity |
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26.
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To calculate an average speed, you would use ____.
a. | weight and time | c. | acceleration | b. | weight and distance | d. | distance and
time |
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27.
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____ is used to describe an object slowing down because of decreasing
speed.
a. | Acceleration | c. | Negative acceleration | b. | Average
speed | d. | Inertia |
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28.
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A bottle opener is a(n) ____.
a. | first-class lever | c. | third-class lever | b. | second-class lever | d. | inclined plane |
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29.
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An object that has a ____ will accelerate in the direction of the force.
a. | normal force | c. | frictional force | b. | net force | d. | speed |
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30.
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____ is the rate at which an object covers a given distance.
a. | Acceleration | c. | Force | b. | Speed | d. | Motion |
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31.
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____ is NOT a force.
a. | Gravity | c. | Friction | b. | Mass | d. | all of these |
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32.
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A 1-cm screw with a 4-cm thread would have a mechanical advantage of
____.
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33.
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Stepping from a wagon and watching the wagon move away from you is an example of
Newton’s ____ law.
a. | first | c. | third | b. | second | d. | gravitational |
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Modified True/False Indicate
whether the statement is true or false. If false, change the identified word or phrase to make the
statement true.
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34.
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Acceleration is a rate that can describe how speed or direction is
changing. _________________________
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35.
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A compound machine is a combination of simple machines.
_________________________
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36.
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A combination of pulleys increases the effort force, so the mechanical advantage
is greater than one. _________________________
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37.
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Average speed does not include the time a car sits at red lights on the
way home. _________________________
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38.
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There is usually more friction on a smoother surface.
_________________________
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Matching
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Match each statement or term with the correct description.
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39.
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the time it takes to make a trip
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40.
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the mass of a person on a scale
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41.
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the acceleration of a car turning a corner
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42.
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friction
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43.
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speed
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44.
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color
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45.
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taste
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46.
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the weight of a person standing still
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47.
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gravity
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48.
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pushing your friend toward the door
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Short Answer
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49.
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How could you use a board and different materials found in the classroom to show
the effect of friction on a rolling marble?
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Essay
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50.
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What is the average speed of a car traveling 210 km in 3 h?
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51.
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Calculate the distance an object travels if its speed is 60km/h and it travels
for 6 h.
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52.
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Calculate the mass of an object with a force of 20 N and an acceleration of 2
m/s2.
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53.
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Calculate the acceleration of an object that starts at rest and accelerates
smoothly to 20 m/s in 5 s.
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54.
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Calculate the work of a weight lifter lifting a 400-N weight a distance of 2
m.
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55.
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According to Newton’s first law, if an arrow is shot in an open field, it
should keep moving. Explain why the arrow eventually stops.
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56.
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Explain what inertia means.
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