31 Cards in this Set
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Formula for weight:
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Weight = mass•gravity
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Inertia
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The tendency of matter to remain in a state of relative rest or relative velocity.
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An object undergoing free-fall has what kind of acceleration?
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constant
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A satellite orbiting the earth in a constant orbital speed...
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is accelerating because an unbalanced gravitational force acts on it
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If an unbalanced force acts on an object, then:
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the object will accelerate
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Is Displacement a vector or scalar quantity?
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Vector
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What defines a vector quantity?
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having magnitude and direction
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What defines a scalar quantity?
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only having magnitude, no direction
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Is speed a vector or scalar quantity?
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Scalar
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If two objects travel the same distance during equal time intervals they must have the same . . .
Answer
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Average speed
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According to Newton's Second Law, when an unbalanced force acts on a particle or object, the object will . . .
Answer
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accelerate at a rate inversely proportional to the mass of the object and directly proportional to the force exerted
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The product of an object's mass and the acceleration due to gravity equals . . .
Answer
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The weight of that object
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Acceleration means the change in _____ per unit of time.
Answer
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Velocity
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Assume that on a certain planet the acceleration due to gravity is 5.0 m/s^2. An object is dropped from rest at a great height. In m/s what will be the object's speed after falling 3.0 s?
Answer
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15 m/s
V = Vo + at
V = 0 + 5.0 * 3.0 = 15 m/s
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Assume that on a certain planet the acceleration due to gravity is 5.0 m/s^2. An object is dropped from rest at a great height. In m/s what will be its AVERAGE speed during the first 3.0 s of fall?
Answer
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7.5m/s
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Assume that on a certain planet the acceleration due to gravity is 5.0 m/s^2. An object is dropped from rest at a great height. In meters how far will it fall during the first 3.0 seconds?
Answer
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23 m
Since average velocity is 7.5 m/s, and the object fell for three seconds, distance = 7.5 * 3.0 = 23 m
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An object that moves from 12 m/s to 72 m/s in 6.0 s has an average acceleration equal to . . .
Answer
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10 m/s^2
average acceleration = ( Vf - Vo )/(Tf - Ti )
= ( 72 - 12 ) / 6 = 10. m/s^2
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An 80.0 kg astronaut who weighs 784 N on Earth would weigh how many Newton's on the Moon? (HINT: Moon g = 1.63 m/s^2)
Answer
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130. N
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A motorcycle traveling at 8.9 m/s that accelerates to 40. m/s in 6.0 s is accelerating at a rate of . . .
Answer
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5.2 m/s^2
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If you repeat the experiment with the same time interval t=1/15 s (exact), and you record the distance traveled (cm) per time interval as follows: 4.31 8.72 13.4 What is the average velocity?
Answer
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132 cm/s
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If you repeat the experiment with the same time interval 1/15 s (exact), what is the gravitational acceleration measured if you have the following experimental values for the change in velocities over one time interval: 64.5 66.5 64.0 ?
Answer
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975 cm/s^2
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If you repeated this experiment (time interval = 1/15 s (exact) per segment) on planet X, which has a gravitational acceleration of 19.4 m/s^2, what would be the final velocity after 7 segments?
Answer
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9.05 m/s
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To minimize errors in calculations as you count spark tracks you should . . .
Answer
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Starting from the second dot and using four intervals at a time will minimize errors more efficiently.
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If you give the falling slide an initial downward speed when doing the experiment, what will be the effect on your measurement of g?
Answer
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No effect
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A student determines the acceleration due to gravity in Denton to be 968.6 cm/s^2. If the accepted value is 979.0 cm/s^2 what is the PERCENT error?
Answer
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1.06
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When you performed the Free-Fall experiment which of the following sources of error was most difficult to control?
Answer
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Reducing the friction
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What is the MKS value for acceleration due to gravity (Hint: the unit must be m/s^2)?
Answer
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9.8 m/s^2
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When measuring the segment distances on the tape, why did we use the vernier caliper for the first few measurements then switch to the meter stick?
Answer
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To keep sig figs through the experiment
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What is the PERCENT DIFFERENCE if Pablo measures g to be 957 m/s^2 and Cindy measures it to be 973 m/s^2?
Answer
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1.7
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What is the PERCENT ERROR for 9.61 m/s^2 if 9.79 m/s^2 is the standard value for g in Denton?
Answer
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1.8
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In the experiment, if your change in velocities looked like this for segments 3 through 7: 64.6 64.5 65.1 64.9 41.6, which of the following best describes the results?
Answer
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The apparatus hit the bottom before sparking all dots
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PHYS 1420: LAB 3