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20 Cards in this Set
- Front
- Back
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In physical science, a push or a pull is called a(n):
a. force. b. acceleration. c. inertia. d. motion. |
a. force
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Forces can be added together only if they are
a. acting on the same object. b. balanced forces. c. unaffected by gravity. d. substantial. |
a. acting on the same object.
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Balanced forces acting on an object
a.always change the object’s motion. b.sometimes change the object’s motion. c.never change the object’s motion. d.are not related to motion. |
c.never change the object’s motion.
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The force of gravity on a person or object on the surface of a planet is called
a. mass. b. terminal velocity. c. weight. d. free fall. |
c. weight.
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When the only force acting on a falling object is gravity, the object is said to be
a. stationary. b. decelerating. c. in free fall. d. a projectile. |
c. in free fall.
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Which of the following is an example of increasing friction intentionally?
a.waxing skis b.adding grease to gears on a bike c.throwing sand on an icy driveway d.oiling a squeaky door |
c.throwing sand on an icy driveway
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Which of the following is an example of rolling friction?
a. your shoes on a sidewalk as you walk b. bike tires on the road as you ride c. a boat on the water as it sails d. two hands rubbing together |
b. bike tires on the road as you ride
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The greater the mass of an object,
a. the easier the object starts moving. b. the greater its inertia. c. the more balanced it is. d. the more space it takes up. |
b. the greater its inertia.
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One way to increase acceleration is by
a. increasing mass. b. decreasing mass. c. decreasing force. d. increasing both force and mass proportionally. |
b. decreasing mass.
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According to Newton’s third law of motion, when a hammer strikes and exerts force on a nail, the nail
a. creates a friction with the hammer. b. disappears into the wood. c. exerts an equal force back on the hammer. d. moves at a constant speed. |
c. exerts an equal force back on the hammer.
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According to the law of conservation of momentum, when two objects collide in the absence of friction,
a. velocity decreases. b. velocity increases. c. momentum is not lost. d. only the object with the larger mass continues on. |
c. momentum is not lost.
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True or False: Unbalanced forces do not change an object’s motion.
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False (BALANCED forces)
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True or False: Friction depends on the types of surfaces involved and how hard the surfaces push together.
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True
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True or False: Mass and air resistance affect the gravitational attraction between objects.
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False (Mass and DISTANCE)
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True or False: The property of matter that resists a change in motion is called inertia.
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True
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True or False: According to Newton’s second law of motion, weight depends on an object’s mass and the net force acting on the object.
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False (ACCELERATION, not weight)
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True or False: Newton’s third law of motion states that for every action there is an equal and opposite reaction.
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True
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Fill in the blank: The overall force on an object after all the forces are added together is called the ____________________ force.
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net
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Fill in the blank: The official SI unit for force is the ____________________.
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newton
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True or False: General Science is your favorite class OF ALL TIME.
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True (Don't even try to deny it.)
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