Section 1
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What is the net force when a pair of 5-N forces simultaneously act in the same direction on an object?
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Date created
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Cards (62)
Section 1
(50 cards)
What is the net force when a pair of 5-N forces simultaneously act in the same direction on an object?
10 N
While a car travels around a circular track at a constant speed, its inertia is zero. acceleration is zero. velocity is zero. none of the above
None of the above
The difference between speed and velocity involves ______.
Direction
A ball rolling down an inclined plane each second picks up ______.
The same amount of speed each second
Whenever a net force acts on an object, there is a change in the object's _______.
Velocity
If while riding in a smooth-riding train, you toss a coin upward, the coin will normally land ______.
In your hand
If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about
2 seconds
While you are in a bus that moves at 100 km/h you walk from the back to the front at 10 km/h. What is your speed relative to the road outside?
110 km/h
Which BEST describes what occurs when a body accelerates?
Change in velocity per unit time
Use the "Force applied" slider to set the force applied on the elephant to somewhere in the middle of the range. After you have set the "Force applied" slider, do not change it again for this question. How would the acceleration change if the mass of the elephant were increased?
It decreases
As a skydiver gains speed in falling through the air, air resistance _______.
Increases
What did Galileo demonstrate in his Leaning Tower of Pisa experiment?
He demonstrated that light and heavy objects gain the same amount of speed when falling.
Use the "Mass of elephant" slider to set the mass of the elephant to somewhere in the middle of the range. After you have set the "Mass of elephant" slider, do not change it again for this question. How would the acceleration change if the applied force on the elephant were increased?
It increases
A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s?
100 m
A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about
The same
How much support force acts on a 200-N girl standing on a weighing scale?
200 N
A rock dropped from a 5-m height accelerates at 10 m/s2 and strikes the ground 1 s later. If the rock is dropped from a height of 2.5 m, its acceleration of fall is
The same
Which of these is the most basic science?
Physics
Technology is a tool for ______.
Applying scientific discoveries
A scientific hypothesis deemed valid must have a test for proving it ______.
Wrong
Equations in Conceptual Physics are used mainly _______.
Guides to thinking
Galileo discovered that when air resistance can be neglected, all objects fall with the same ______.
Acceleration
What was the greatest discovery by Galileo during his inclined-plane experiments?
He discovered that a ball rolling down an incline and onto a horizontal surface would roll indefinitely.
An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is
0 m/s2
Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is
6 m/s
An apple falls from a tree and hits the ground 5 meters below with a speed of about
10 m/s
In its first second of free fall, a dropped softball will fall a vertical distance of ______.
5 m
Newton said that something was needed to change the motion of an object. A clear reading of his first law tells us that what is needed is ______.
A non-zero net force
Which depends on gravity?
Weight
A crate sits at rest on a factory floor. Friction between the crate and floor occurs _______.
when the crate is pushed horizontally, whether sliding or not
The direction of the force of friction on a sliding crate is _______.
Opposite to the direction of sliding
What is the value of the velocity of the ball when it reaches its maximum height?
It is always zero
The scientific method of Galileo and Bacon is ______.
One of many ways of making discoveries
Neglecting air resistance, a ball projected straight upward so it remains in the air for 10 seconds needs an initial speed of
50 m/s
What is the acceleration of the ball when it is moving up, when it is at the maximum height, and when it is moving down? (Note: The acceleration graph is shown in red.)
It is always negative
Galileo's definition of speed was a breakthrough because he is acknowledged to be the first to consider ______.
Time
When we are talking about how quickly "how fast" changes, we're talking about ______.
Acceleration
An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration in meters per second per second is approximately
0
The Greek mathematician Eratosthenes made measurements to show the size of _______.
Earth
What is the net force on a crate sliding at an unchanging speed when pushed with a steady force of 75 N?
Zero
Listed following are a series of statements that each make a claim. Classify these as either testable by accepted methods of science or non-testable by accepted methods of science. Be sure to note that this question does not ask whether a statement would pass or fail a test; it only asks whether it is testable in principle.
Not tested by science: Hurricane Katrina was an act of God Vince Young is the greatest quarterback of all time. Tested by science: Earth orbits the Sun every 365.25 days. There will be a solar eclipse next Tuesday at 11 a.m. People born under the sign of Sagittarius are twice as likely to be teachers as anyone else. Mars once had liquid water on its surface. Bacteria acquire resistance to antibiotics through changes in their DNA.
A speedometer normally measures ______.
Instantaneous speed
A theory in science is ______.
A synthesis of well-tested ideas
A fact in science is ______.
An agreement between trained investigators
If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is
6 m/s2
At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately
40 m/s
If an object moves with constant acceleration, its velocity must
Change by the same amount each second
Which of Newton's laws does the equilibrium rule illustrate?
Newton's first law
A ball freely falling at 20 m/s will in the next second have a speed of ______.
30 m/s
Religion is concerned mainly with the ______.
Spiritual world
Section 2
(12 cards)