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# Physics: Motion, Forces, and Newton's Laws

Created by
@MesmerizingBongos

285.6

remains constant

9

### If a figure skater is moving to the right at a constant speed, what must be true?

<p>No net force is acting on the figure skater</p> Signup and view all the answers

### If a second object requires twice the force to produce the same acceleration as an object of mass M, what is the mass of the second body?

<p>2M</p> Signup and view all the answers

### If a freight train rolls at the same speed but has twice as much mass, what happens to its momentum?

<p>doubled</p> Signup and view all the answers

### What is the force required to keep a hockey puck sliding at a constant velocity across a frozen pond, neglecting friction and air resistance?

<p>zero</p> Signup and view all the answers

### What is the force exerted by a 40kg boy on an 80kg man if the man pushes the boy with a force of 100N?

<p>100N</p> Signup and view all the answers

### If a car increases its velocity from zero to 60km/h in 3 seconds, what is its acceleration in m/s/s?

<p>5.6</p> Signup and view all the answers

### If a monkey floating in outer space throws his hat away, what happens to the hat and the monkey?

<p>Move away from each other but at different speeds</p> Signup and view all the answers

### If an object falling freely measures the distance it travels each second, what can be said about the amount of distance traveled with each succeeding second?

<p>greater than the second before</p> Signup and view all the answers

### If an object moves with constant acceleration, what must happen to its velocity?

<p>Change by the same amount each second</p> Signup and view all the answers

### If you apply the same force to objects with masses M and 4M, how does the acceleration of mass M compare to that of mass 4M?

<p>Four times the acceleration of mass 4M</p> Signup and view all the answers

### In each second of a fall, how does the distance a freely falling object will fall change?

<p>increasing</p> Signup and view all the answers

### In the SI Unit system, how is distance measured?

<p>meters</p> Signup and view all the answers

### In the SI Unit system, how is time measured?

<p>seconds</p> Signup and view all the answers

### One half second after starting from rest, what speed will a freely falling object have?

<p>5m/s</p> Signup and view all the answers

### Stars that have ________ mass than the sun will end their lives as brown dwarfs.

<p>less</p> Signup and view all the answers

### Stars that have ________ mass than the sun will end their lives as white dwarfs.

<p>the same</p> Signup and view all the answers

### If the gravitational acceleration on the moon is 1/6 of that on Earth, what is the weight in Newtons of an object that weighs 57N on Earth?

<p>9.5</p> Signup and view all the answers

### What is the language of physics?

<p>mathematics</p> Signup and view all the answers

### What does the slope of a velocity vs time graph indicate?

<p>acceleration</p> Signup and view all the answers

### A reflecting telescope uses a lens to reflect the light.

<p>False</p> Signup and view all the answers

### Speed has a direction.

<p>False</p> Signup and view all the answers

### Stars that are moving away from us are called 'red-shifted'.

<p>True</p> Signup and view all the answers

### The first step in the hydrogen process is a helium atom fusing with a hydrogen atom.

<p>False</p> Signup and view all the answers

### The sun is just an ordinary star.

<p>True</p> Signup and view all the answers

### The universe is expanding.

<p>True</p> Signup and view all the answers

### What is the slope of the graph if it is a negative slope?

<p>-3m/s</p> Signup and view all the answers

### Which astronomer chose to put the Earth at the center of the universe?

<p>Ptolemy</p> Signup and view all the answers

### Which astronomer was imprisoned because of his support of the sun-centered universe model?

<p>Galileo</p> Signup and view all the answers

### Which element is most abundant in stars?

<p>Hydrogen</p> Signup and view all the answers

### Which of the following is a government research lab?

<p>Argonne National Lab</p> Signup and view all the answers

### What is Kepler's first law?

<p>Planets move in elliptical orbits with the sun at focus</p> Signup and view all the answers

### What is Kepler's second law?

<p>A line from the sun to the earth sweeps out equal areas in equal times</p> Signup and view all the answers

### Which of the following is not part of the scientific method?

<p>belief</p> Signup and view all the answers

### What is Newton's second law?

<p>Force equals mass times acceleration</p> Signup and view all the answers

### Which part of the sun is the outermost layer?

<p>corona</p> Signup and view all the answers

### Which part of the sun is the source of solar wind particles?

<p>corona</p> Signup and view all the answers

### Why are sunspots darker than the surrounding parts of the sun?

<p>They are cooler than the surrounding parts of the sun</p> Signup and view all the answers

## Study Notes

### Motion and Forces

• A car measuring 840 kg, moving at a speed of 1.7 m/s, experiences a braking force of 285.6 N to stop in 5 seconds.
• Acceleration of a car starting from rest, reaching 27 m/s in 3 seconds is calculated as 9 m/s².
• An object thrown upwards while neglecting air resistance maintains constant acceleration throughout its flight.
• A hockey puck sliding on a frictionless surface requires no additional force to maintain constant velocity.

### Newton's Laws

• Constant velocity indicates no net force acting on the object involved, such as a figure skater moving steadily.
• Applying the same force to two objects of masses M and 4M results in acceleration for mass M being four times that of mass 4M.
• Newton's second law is defined as Force = Mass × Acceleration.

### Gravity and Free Fall

• Freely falling objects cover greater distances with each second due to increased acceleration.
• A freely falling object from rest will have a speed of approximately 5 m/s after half a second.
• The gravitational acceleration on the Moon is 1/6 that of Earth. An object weighing 57 N on Earth weighs about 9.5 N on the Moon.

### Astronomy and Celestial Bodies

• Stars with masses less than the Sun will end their lives as brown dwarfs, while those with the same mass will become white dwarfs.
• The most abundant element in stars is hydrogen.
• The expanding universe indicates that stars are moving away from us, labeled as "red-shifted".

### Historical Figures in Astronomy

• Ptolemy proposed the Earth-centered model of the universe.
• Galileo supported the sun-centered universe model, leading to his imprisonment for his beliefs.

### Scientific Method and Research

• The scientific method consists of systematic observation and experimentation, excluding mere belief.
• The Argonne National Laboratory serves as a government research facility.

### Solar Dynamics

• The Sun's outermost layer is known as the corona, which is also the source of solar wind particles.
• Sunspots appear darker because they are cooler relative to the surrounding areas on the Sun.

### Kepler's Laws

• Kepler's first law states that planets orbit in elliptical paths with the Sun at one focus.
• Kepler's second law describes that a line segment from the Sun to a planet sweeps out equal areas during equal intervals of time.

### Physics Fundamentals

• In SI units, distance is represented in meters, and time in seconds.
• The slope of a velocity vs. time graph indicates the object's acceleration.

### Summary of Concepts

• Constant acceleration results in velocity changing consistently over time.
• The effects of mass and force are fundamental in mechanics, explaining how different objects respond under similar force applications.
• Representations in physics transition to mathematical formulations, emphasizing the discipline's reliance on precise measurements and calculations.

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## Description

Explore the fundamental concepts of motion and forces in this quiz. Test your understanding of Newton's Laws, acceleration, and the effects of gravity on free-falling objects. Perfect for physics enthusiasts and students alike.

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