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Universities » Longwood University (LU) » PHYS - Physics » 103 - Conceptual Physics » Flash Cards

Test 3 - Flashcards

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Class:PHYS 103 - Conceptual Physics
Subject:Physics
University:Longwood University
Term:Spring 2010
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Inertia property of objects to maintain their states of motion
Which depends on location – weight or mass? Which depends on gravity – weight or mass? Location-mass gravity-weight
Where would your weight be greater – on the earth or on the moon? How about your mass? weight is greater on the earth mass stays the same
What are the units of measurement for weight and for mass? weight-lbs or newtons mass-kg
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One kilogram weighs 10 N on earth. Would it weigh more or less on the moon? less
What is the net force on a box that is being pushed to the right with 50 N of force, while it is also being pushed to the left with 20 N of force? 30 N
How much tension is there in a vertical rope that holds a 20-N bag of apples at rest? 180N
8. What does sigma F = 0 mean? The vector sum of forces; the sum is equal to zero; equilibrium
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A bowling ball sits at rest. Another ball rolls down a lane at constant speed. Which, if either, is in equilibrium? Defend your answer. The bowling ball is in equilibrium because gravity is pulling it down while the floor pushes which acts as a support force. The rolling ball is also in equilibrium because it is a constant speed in a straight line. Equilibrium= no change.
If we push a crate at a constant velocity, how do we know how much friction acts on the crate compared with our pushing force? • When the crate is moving at constant velocity your force is equal to the force of friction.
How does the direction of the friction force compare with the velocity of a sliding object? • It is opposite
If you push to the right on a on a heavy piece of furniture and it slides, what is the direction of the friction on the furniture? To the left
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Suppose you push to the right on a heavy piece of furniture, but not hard enough to make it slide. Does a friction force act on the furniture? Yes, it is pushing equally as hard in the opposite direction
Distinguish between velocity and acceleration • Velocity- the speed of an object and specification of its direction of motion. • Acceleration-the rate at which velocity changes in time; the change in velocity may be in magnitude or direction or both, usually in measured in units m/s.
What is the acceleration of an object that moves at a constant velocity? What is the net force on the object in this case? acceleration=0 net force=0
What is the acceleration of an object in free fall at the earth’s surface? 10 m/s2
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What physical quantity is a measure of how much inertia an object has? mass
Gravitational force on the moon is only 1/6 that of the gravitational force on the earth. What would be the weight of a 10-kg object on the moon and on the earth? What would its mass be on the moon an on the earth? • 60 kg on the earth • Mass on the moon and earth- 98 N
A hockey puck slides across the ice at a constant velocity. Is it in equilibrium? Why or why not? Yes, because it is at a constant velocity
Suppose that a freely falling object were somehow equipped with a speedometer. By how much would its speed reading increase with each second of fall? 10 m/s
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Suppose that the freely falling object in the preceding exercise were also equipped with an odometer. Would the readings of distance fallen each second indicate equal or unequal distances of fall for successive seconds? Explain. • Equal distances because the distance of the free fall from rest is directly proportional to the square of the time of the fall.
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 Inertiaproperty of objects to maintain their states of motion
 Which depends on location – weight or mass? Which depends on gravity – weight or mass?Location-mass
gravity-weight
 Where would your weight be greater – on the earth or on the moon? How about your mass?weight is greater on the earth

mass stays the same
 What are the units of measurement for weight and for mass?weight-lbs or newtons

mass-kg
 One kilogram weighs 10 N on earth. Would it weigh more or less on the moon?less
 What is the net force on a box that is being pushed to the right with 50 N of force, while it is also being pushed to the left with 20 N of force?30 N
 How much tension is there in a vertical rope that holds a 20-N bag of apples at rest?180N
 8. What does sigma F = 0 mean?The vector sum of forces; the sum is equal to zero; equilibrium
 A bowling ball sits at rest. Another ball rolls down a lane at constant speed. Which, if either, is in equilibrium? Defend your answer. The bowling ball is in equilibrium because gravity is pulling it down while the floor pushes which acts as a support force.

The rolling ball is also in equilibrium because it is a constant speed in a straight line. Equilibrium= no change.
 If we push a crate at a constant velocity, how do we know how much friction acts on the crate compared with our pushing force?• When the crate is moving at constant velocity your force is equal to the force of friction.
 How does the direction of the friction force compare with the velocity of a sliding object?• It is opposite
 If you push to the right on a on a heavy piece of furniture and it slides, what is the direction of the friction on the furniture?To the left
 Suppose you push to the right on a heavy piece of furniture, but not hard enough to make it slide. Does a friction force act on the furniture?Yes, it is pushing equally as hard in the opposite direction
 Distinguish between velocity and acceleration• Velocity- the speed of an object and specification of its direction of motion.

• Acceleration-the rate at which velocity changes in time; the change in velocity may be in magnitude or direction or both, usually in measured in units m/s.
 What is the acceleration of an object that moves at a constant velocity? What is the net force on the object in this case?acceleration=0

net force=0
 What is the acceleration of an object in free fall at the earth’s surface?10 m/s2
 What physical quantity is a measure of how much inertia an object has?mass
 Gravitational force on the moon is only 1/6 that of the gravitational force on the earth. What would be the weight of a 10-kg object on the moon and on the earth? What would its mass be on the moon an on the earth?• 60 kg on the earth
• Mass on the moon and earth- 98 N
 A hockey puck slides across the ice at a constant velocity. Is it in equilibrium? Why or why not?Yes, because it is at a constant velocity
 Suppose that a freely falling object were somehow equipped with a speedometer. By how much would its speed reading increase with each second of fall?10 m/s
 Suppose that the freely falling object in the preceding exercise were also equipped with an odometer. Would the readings of distance fallen each second indicate equal or unequal distances of fall for successive seconds? Explain. • Equal distances because the distance of the free fall from rest is directly proportional to the square of the time of the fall.
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