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Questions and Answers
Which of the following is a scientific statement?
Which of the following is a scientific statement?
A theory in the field of science is
A theory in the field of science is
Which of the following is a fundamental quantity?
Which of the following is a fundamental quantity?
Galileo's use of inclined planes allowed him to effectively
Galileo's use of inclined planes allowed him to effectively
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Inertia is defined as a
Inertia is defined as a
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An object in mechanical equilibrium is an object
An object in mechanical equilibrium is an object
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When you flick a card from beneath a coin that hardly moves, you're illustrating
When you flick a card from beneath a coin that hardly moves, you're illustrating
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A pair of wires support a heavy painting. Tension in the wires is greater when they are
A pair of wires support a heavy painting. Tension in the wires is greater when they are
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If a woman walks at a speed of 2 miles / hour for 3 hours, she will have walked
If a woman walks at a speed of 2 miles / hour for 3 hours, she will have walked
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Consider the measurement 10 m North. What physics parameter does this represent?
Consider the measurement 10 m North. What physics parameter does this represent?
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A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is
A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is
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A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
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A cantaloupe is under free fall. Twelve seconds after starting from rest, a freely-falling cantaloupe has a speed of
A cantaloupe is under free fall. Twelve seconds after starting from rest, a freely-falling cantaloupe has a speed of
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If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about
If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about
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At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately
At one instant a heavy object in air is moving upward at 50 m/s. One second later its speed is approximately
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Which of the following is NOT a vector quantity?
Which of the following is NOT a vector quantity?
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Whenever the net force on an object is zero, its acceleration
Whenever the net force on an object is zero, its acceleration
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A 10-N falling object encounters 4 N of air resistance. The net force on the object is
A 10-N falling object encounters 4 N of air resistance. The net force on the object is
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A bag of groceries that has a mass of 10 kilograms weighs about
A bag of groceries that has a mass of 10 kilograms weighs about
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A heavy ball hangs by a string, with a second string attached to its bottom A quick pull on the bottom string breaks the
A heavy ball hangs by a string, with a second string attached to its bottom A quick pull on the bottom string breaks the
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A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?
A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?
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A rock is thrown vertically into the air. At the top of its path, its acceleration is
A rock is thrown vertically into the air. At the top of its path, its acceleration is
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A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is
A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is
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A sheet of paper and a book fell at different rates in the classroom ( air resistance is present). The same paper when wadded up into a ball and dropped, fell down at the same rate as the book. This is because
A sheet of paper and a book fell at different rates in the classroom ( air resistance is present). The same paper when wadded up into a ball and dropped, fell down at the same rate as the book. This is because
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Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
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An astronaut on a strange planet has a mass of 10 kg and a weight of 240 N. What is the acceleration due to gravity of this planet?
An astronaut on a strange planet has a mass of 10 kg and a weight of 240 N. What is the acceleration due to gravity of this planet?
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A skydiver's terminal velocity will be greatest if she falls
A skydiver's terminal velocity will be greatest if she falls
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One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is
One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is
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Situation: A player catches a ball.
In the above situation , if action is the force of the ball against the player's glove, reaction is the
Situation: A player catches a ball. In the above situation , if action is the force of the ball against the player's glove, reaction is the
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Newton is a Unit of
Newton is a Unit of
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Study Notes
Scientific Statements & Theories
- Scientific statements must be testable and falsifiable.
- Example of a scientific statement: "Matter is filled with undetectable particles." (B) is a potential scientific statement that can be investigated.
- A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. (C)
Fundamental Quantities
- Fundamental quantities are quantities that cannot be defined in terms of other quantities.
- Example: displacement is a fundamental quantity. (D)
- Velocity, acceleration, force, and temperature are derived quantities. (A, B, C, E)
Galileo's Experiments
- Galileo used inclined planes to slow down the changes in speed of objects for better measurement and analysis. (A)
- Inclined planes allowed observation of the effects of gravity on motion more effectively than free fall alone. (A)
Inertia
- Inertia is a property of matter that results in resistance to changes in motion. (A)
Mechanical Equilibrium
- An object in mechanical equilibrium is an object either at rest or moving with a constant velocity in a straight-line path. (D)
- This means it has no acceleration or zero net force acting on it (D).
Examples of Forces & Motion
- Flicking a card from beneath a coin demonstrates inertia. (B)
- Tension in supporting wires is greater when the wires are not vertical. (A)
- Distance travelled = speed × time (C in question 9)
- Displacement is a vector quantity. (C in question 10)
Acceleration
- Acceleration = (change in velocity) / (change in time) (B in question 11, D in question 24)
- Constant upward velocity means zero acceleration. (A in question 13)
- Free fall acceleration due to gravity approximately = 10 m/s^2. (B, C in question 14, 15 ,16)
Vectors and Scalars
- Distance is a scalar quantity. (A in question 17)
- Velocity, force (or Weight), and friction are vector quantities. (B, D, C in question 17)
Net Force & Acceleration
- Objects accelerate when a net force is applied. (A in question 18, A in 19)
- Force and acceleration directly related. (B in question 22)
- If net force is 0 then acceleration is zero. (A in 18)
- Weight of object = mass × acceleration due to gravity (E in 20)
String Tension
- If two strings support an object, the bottom string is first to break if the object mass is large enough. (C in 21)
Free Fall
- The acceleration due to gravity on a planet is 24 m/s.^2 (A in question 27)
- The acceleration of an object in free fall is always directed downward. (A in question 13)
- In free fall objects of different weights fall at the same rate (assuming no air resistance). (A in question 26)
- Terminal velocity of an object depends on air resistance and its shape. (B, C, D in question 28)
Newton's Third Law
- For every action, there is an equal and opposite reaction. (A in 30)
- Tension in a rope (when both ends are pulled) is equal to the force applied at the endpoints. (C in 29)
Units
- Newton (N) is a unit of force. (C in 31)
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Description
Test your understanding of scientific statements, theories, and fundamental quantities. This quiz covers essential concepts such as Galileo's experiments and the principle of inertia. Each question will challenge your knowledge of how scientific principles are defined and tested.
