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28 Cards in this Set
- Front
- Back
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Net Force
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The combination of all forces acting on an object.
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Velocity changes when . . .
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the direction of motion changes.
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The more mass an object has . . .
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the greater its inertia is.
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Friction always acts in a direction _________of motion.
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opposite
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When you walk, you push on the sidewalk, and . . . .
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the sidewalk pushes on you with equal force.
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How does velocity change with time?
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acceleration
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When an object is at rest, what is its speed?
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o m/s
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N is ________.
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the unit of force
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m is _____________.
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the unit of distance
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What does mass measure?
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the quantity of matter in an object.
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According to Newton's Third Law, forces always occur in ________ but _________pairs.
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equal but opposite
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A rocket blasting off is best represented by Newton's ________law of motion.
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3rd law of motion
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speed is calculated by _____________.
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divide distance traveled by the time it takes to travel that distance
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According to Newton's first law of motion, an object moving in a straight line at constant speed will continue . . .
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that unless acted on by a force.
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If a soccer ball takes 40 seconds to roll 20 meters, what is the average speed of the soccer ball?
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0.5 m/s
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If you want to calculate the acceleration of a car, you should _________ the change in speed of the car by the time interval.
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divide
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What is the term for speed at any instant in time?
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instantaneous speed
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Newton's first law of motion states that an object stays at rest unless a(n) ________ acts on it.
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unbalanced force
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Which one of the following objects has the greatest inertia? a. baseball b. pen
C. bowling ball |
c. bowling ball
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A force is which one of these?
a. push b. a pull c. a push or pull d. none of these |
c. a push or pull
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What unit is used to measure force?
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Newtons
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A force is exerted on a box and an equal and opposite force is exerted by the box. What explains this?
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Newton's third law of motion
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Explain Newton's 1st Law of Motion
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An object will not change its motion unless an unbalanced force acts on it.
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What is a force?
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a push or a pull
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What is inertia?
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the tendency to resist a change in motion
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What is acceleration?
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the change in velocity divided by the time needed for the change to occur.
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What is velocity?
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it is the speed of an object and its direction of motion
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What is Newton's 2nd Law?
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if an object is acted upon by a net force, the acceleration of the object will be in the direction of the net force, and the acceleration equals the net force divided by the mass.
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