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Forces that are equal in size but opposite in direction are ____.
balanced forces
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If gravity did not affect the path of a horizontally thrown ball, the ball would ____.
travel horizontally
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Newton's first law of motion states that an object remains at rest unless a ____ force acts on it.
Net
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The force you have to overcome to start an object moving is ____.
Static Friction
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Whenever a body is in motion, there is always ____ to oppose the motion.
Friction
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The relationship among force, mass, and acceleration is stated in ____.
Newton's second law of motion
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According to Newton's second law of motion, ____.
a = Fnet /m
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A 3,000-N force gives an object an acceleration of 15 m/s2. The mass of the object is ____.
200 KG.
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A 300-N force acts on a 25-kg object. The acceleration of the object is ____.
12 m/s 2
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The statement "for every action, there is an equal but opposite reaction" is a statement of ____.
Newtons Third Law
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With action-reaction forces, ____.
The forces are created at the same time.
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Inertia is a measure of the ____ of an object.
mass
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The unit of force is ____.
The Newton
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When two birds are pulling on a worm and the worm moves toward the first bird, you know that the forces are ____.
Unbalanced
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An unbalanced force acting on an object causes it to ____.
Accelerate
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A planet is discovered that is the same size as Earth and has the same
gravitational acceleration, but has twice the mass. If you weigh 700 N
on Earth, on the new planet you would weigh ____.
1400 N
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The force that opposes motion is ____.
Friction.
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Every force has a(n) _____ force.
opposite
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You throw a ball into the air. As the ball leaves your hand, the force(s) acting on it is/are ____.
Gravity and your hand
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A student has a set of masses to use in an experiment about force. Which
of the following masses would require the least amount of force to be
lifted from the lab table?
1-g mass
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Which statement best describes how the mass of an object affects the amount of force needed to move the object?
Larger masses require more force to move
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The force that acts ____ to the direction of motion is called centripetal force.
Perpendicular.
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A centripetal force holds the planets of the solar system in orbit about the Sun. This force is the result of ____.
Gravity.
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Figure 1 shows the path of a ball
that was thrown up into the air. At which point in the path of the ball
are all the forces on the ball balanced?
point 3.
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Figure 1 shows the path of a ball that was thrown up into the air. Which
of the following is not acting on the ball in the diagram?
Static Friction
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Refer to Figure 2. Which pair of force vectors represents an object that is accelerating to the right?
Pair c.
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Refer to Figure 2. Which pair of force vectors represents balanced forces?
Pair A.
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Refer to Figure 2. Which pair of force vectors represents an object that is falling?
Pair B.
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Refer to Figure 2. Which pair of force vectors represents acceleration to the left?
Pair D.
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A student sees a motionless ball resting on a table. Which of the following best describes the forces acting on the ball?
Gravity is creating a downward force that is equal to the force of the table pushing up.
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Figure 3 shows forces acting on a car. Which statement best predicts the motion of the car?
The car will move forward.
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Figure 4 shows a ball and the forces acting on it. Which pair of terms best predicts how the ball should be moving?
to the left and down
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Which diagram in Figure 5 shows static friction resisting the motion of a book?
diagram c
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In which diagram in Figure 5 is the book most likely to be moving horizontally?
Diagram B
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Figure 6 shows three book sitting on a table. How many opposing pairs of
force vectors are needed to describe the forces acting on book B?
3
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