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PHYSICS EXAM 1

Terms in this set (36)

How would air resistance affect the travel time?
Air resistance would increase travel time.
Would acceleration be greater or less if the ramp were a bit less steep?
Acceleration would be less on a less-steep ramp.
How does the time of ascent compare with the time of descent?
The time of ascent equals the time of descent.
Suppose a monkey weighs 102 N and the vine supporting her pulls upward with a force of 140 N. Describe her motion.
The monkey accelerates upward while the force acts.
Rank the tension in the left rope, form greatest to least.
C (man closest to the left rope), B (man second closest to the left rope, A (man farthest away from the left rope.
Would acceleration be greater or less if the ramp were a bit less sleep?
Acceleration would be less on a less-steep ramp.
According to Aristotle, how fast do heavy objects fall compared to light objects?
Aristotle stated that heavy objects fall faster than light objects.
In contrast to Aristotle's way of explaining nature, Galileo relied on?
Experiment.
According to Galileo, inertia is a?
Property of all matter.
Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has the same?
Nothing. Doesn't have the same volume, mass, or weight.
A baseball weighs 1.5 N on Earth. Another type of ball weighs 1.5 N on the Moon. The ball with the greater mass is the?
Other type of ball.
An object that has twice as much mass as another object also has twice as much?
Inertia.
Marie is pushing horizontally on a table that slides across the floor at a constant velocity. If she pushed with the same amount of force, but directed that force downward a bit, how would the amount of friction of the table legs with the floor be affected?
Friction would increase.
With a somewhat downward push, the table would press _________ against the floor (as if it were heavier).
Harder
_________ friction acts on a sliding heavy table than on a lighter one.
More
When an object is in dynamic equilibrium, it __________
Is moving in a straight line at a constant speed.
A glance at the speedometer on your vehicle will tell you your?
Instantaneous speed.
The gain in speed each second for a freely falling object is about?
10 m/s
Ten seconds after starting from rest, a freely-falling baseball will have a speed of about?
100 m/s
Both ends of a piece of rope are pulled by two people in a tug-of-war. If each pulls with a 400 N force, the tension in the rope is?
400 N
The net force on any object moving at a constant velocity is?
Zero
A car traveling at 100 km/h strikes an unfortunate bug that splatters on the windshield. The force of impact is greater on the?
It's the same for both
A boxer can hit a heavy bag with a great force. Why can't he hit a sheet of tissue paper in midair with the same amount of force?
The low mass of the tissue paper limits the amount of force the paper can exert on the boxer, and the forces between the boxer and paper must be equal and opposite.
When a baseball player hits a ball with a force of 1000 N, the ball exerts a force on the bat of?
1000 N
We know the Earth pulls on the Moon. Does it follow that the Moon also pulls on the Earth?
Yes, both pulls make up an interaction; neither can exist without the other.
A friend says that Ally cannot push on the tree unless the tree pushes back on her, and another friend says that if Ally pushes quickly, the tree won't push as hard on her. Which friend do you agree with, and why?
The first friend. Whatever push she exerts on the tree, briefly or otherwise, the pushback by the tree will be equal and opposite. That's Newton's 3rd Law.
Action and reaction pairs of forces always act on?
Different bodies
Earth pulls on the Moon. Similarly the Moon pulls on the Earth, evidence that?
Earth and Moon pull on each other and Earth's and Moon's pulls comprise an action-reaction pair.
The force that directly propels a motor scooter along a highway is that provided by the?
Road
How does the work done compare with the increased potential energy of the load?
They are the same
Which of these forms of energy is NOT renewable?
Fossil fuel power
The main sources of energy on Earth are?
Solar and nuclear
What is the ultimate source of geothermal energy?
Radioactive decay of isotopes in the Earth
A pulley system can?
Multiply a force and change the direction of a force
A ball rolling down an incline has its maximum potential energy at?
The top
Compared to a recoiling rifle, the bullet that is fired has a greater?
Kinetic energy
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