Podcast
Questions and Answers
What remains constant when there is no friction affecting a pendulum's motion?
What remains constant when there is no friction affecting a pendulum's motion?
- The gravitational potential energy at all points
- The kinetic energy alone
- The potential energy at the highest point
- The total mechanical energy (correct)
How is the total mechanical energy (TME) calculated when given mass, height, and velocity?
How is the total mechanical energy (TME) calculated when given mass, height, and velocity?
- TME = 1/2k(x²) + KE
- TME = mgh - KE
- TME = mgh + 1/2mv² (correct)
- TME = KE - PE
What is the distance between two consecutive crests in a wave known as?
What is the distance between two consecutive crests in a wave known as?
- Wavelength (correct)
- Frequency
- Velocity
- Amplitude
When sound travels through a medium, how do the particles of the medium behave?
When sound travels through a medium, how do the particles of the medium behave?
Which of the following statements about sound speed is true?
Which of the following statements about sound speed is true?
What is the unit of measurement for force?
What is the unit of measurement for force?
Which statement accurately describes balanced forces?
Which statement accurately describes balanced forces?
Which of the following best defines a free-body diagram?
Which of the following best defines a free-body diagram?
What is the center of mass of an object?
What is the center of mass of an object?
Which force is classified as a non-contact force?
Which force is classified as a non-contact force?
Which equation correctly represents weight as a force?
Which equation correctly represents weight as a force?
What defines a contact force?
What defines a contact force?
What is the formula for gravitational potential energy (GPE)?
What is the formula for gravitational potential energy (GPE)?
In the work-energy theorem, what does W represent?
In the work-energy theorem, what does W represent?
How much gravitational potential energy does a 224-kg barbell have when lifted to a height of 1.7 m?
How much gravitational potential energy does a 224-kg barbell have when lifted to a height of 1.7 m?
What type of energy is stored in a compressed spring?
What type of energy is stored in a compressed spring?
What is the relationship between centripetal force and the direction of a body in circular motion?
What is the relationship between centripetal force and the direction of a body in circular motion?
If a spring has a spring constant of 5 N/m and is stretched to 0.02 m, what is its elastic potential energy (EPE)?
If a spring has a spring constant of 5 N/m and is stretched to 0.02 m, what is its elastic potential energy (EPE)?
Which statement is true regarding work done when a force is applied but there is no movement?
Which statement is true regarding work done when a force is applied but there is no movement?
What affects the amount of gravitational potential energy an object has?
What affects the amount of gravitational potential energy an object has?
What is the correct expression for calculating work done?
What is the correct expression for calculating work done?
If a spring constant is 150 N/m and the spring is compressed by 0.3 m, how is the EPE calculated?
If a spring constant is 150 N/m and the spring is compressed by 0.3 m, how is the EPE calculated?
Which statement is true regarding work and gravitational potential energy?
Which statement is true regarding work and gravitational potential energy?
What does centrifugal force represent in a circular motion scenario?
What does centrifugal force represent in a circular motion scenario?
What happens to the velocity of an object in uniform circular motion?
What happens to the velocity of an object in uniform circular motion?
What happens to an object's kinetic energy when it falls and has gravitational potential energy?
What happens to an object's kinetic energy when it falls and has gravitational potential energy?
Which of the following is a characteristic of centripetal acceleration?
Which of the following is a characteristic of centripetal acceleration?
In which scenario does work equal zero?
In which scenario does work equal zero?
What is the unit of work in the International System of Units (SI)?
What is the unit of work in the International System of Units (SI)?
Which of the following correctly describes the effect of frictional force on a car in circular motion?
Which of the following correctly describes the effect of frictional force on a car in circular motion?
What is the work done on a box moved with an 80 N force over a distance of 2.5 m?
What is the work done on a box moved with an 80 N force over a distance of 2.5 m?
What is the formula for calculating power?
What is the formula for calculating power?
If an object has a mass of 300 kg and a velocity of 4 m/s, what is its kinetic energy?
If an object has a mass of 300 kg and a velocity of 4 m/s, what is its kinetic energy?
What is the relationship described by the work-energy principle?
What is the relationship described by the work-energy principle?
How do you express kinetic energy in terms of mass and velocity?
How do you express kinetic energy in terms of mass and velocity?
What is the kinetic energy of a 2.9 kg bowling ball moving at 20 m/s?
What is the kinetic energy of a 2.9 kg bowling ball moving at 20 m/s?
In a closed system, what happens to energy?
In a closed system, what happens to energy?
Calculate the work done if a box is moved by a force of 50 N over a distance of 4 m.
Calculate the work done if a box is moved by a force of 50 N over a distance of 4 m.
Which unit is used to measure power?
Which unit is used to measure power?
What is the kinetic energy of an object at rest?
What is the kinetic energy of an object at rest?
Flashcards
Total Mechanical Energy (TME)
Total Mechanical Energy (TME)
The sum of an object's kinetic energy (KE) and potential energy (PE).
Kinetic Energy (KE)
Kinetic Energy (KE)
Energy associated with an object's motion.
Potential Energy (PE)
Potential Energy (PE)
Energy stored due to an object's position or state.
Wave
Wave
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Sound Wave
Sound Wave
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Newton's Third Law
Newton's Third Law
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Unbalanced force
Unbalanced force
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Centripetal force
Centripetal force
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Centrifugal force
Centrifugal force
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Power
Power
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Energy
Energy
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Kinetic Energy
Kinetic Energy
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Potential Energy
Potential Energy
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Work-Energy Principle
Work-Energy Principle
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W = Fd
W = Fd
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KE = 1/2mv^2
KE = 1/2mv^2
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Power = Work/Time
Power = Work/Time
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Conservation of Energy
Conservation of Energy
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Work-energy theorem
Work-energy theorem
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Gravitational Potential Energy (GPE)
Gravitational Potential Energy (GPE)
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GPE Formula
GPE Formula
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Elastic Potential Energy (EPE)
Elastic Potential Energy (EPE)
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EPE Formula
EPE Formula
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Spring constant
Spring constant
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Change in length
Change in length
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Work done on an object
Work done on an object
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Force
Force
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Center of Mass
Center of Mass
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Free-Body Diagram
Free-Body Diagram
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Net Force
Net Force
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Normal Force
Normal Force
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Tension Force
Tension Force
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Friction Force
Friction Force
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Gravitational Force
Gravitational Force
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Weight Force
Weight Force
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Electrostatic Force
Electrostatic Force
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Magnetic Force
Magnetic Force
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Study Notes
Newton's Laws of Motion - Force and Interaction
- Force is a push or pull, a vector quantity with magnitude and direction.
- Force is measured in Newtons (N).
- Types of force include:
- Contact force: interactions between objects that are touching (e.g., normal force, tension force, compression force, friction).
- Non-contact force: interactions between objects that are not touching (e.g., gravitational force, electrostatic force, magnetic force).
- Center of mass: a point where any uniform force on an object acts. For uniform objects, the center of mass is at the centroid.
- Free-body diagram: a diagram used to show the relative magnitude and direction of all forces acting on an object.
Net Force
- Net force is the sum of all forces acting on an object.
- Net force = ΣF
Contact Forces
- Normal Force: A force exerted by a stable object in contact with another object, always perpendicular to the contact surface.
- Tension Force: A force transmitted through a string, rope, cable, or wire, pulling on opposite ends.
- Compression Force: A force exerted by a compressed or stretched spring on an object attached to it.
- Friction Force: A force, always parallel to the surface, that slows or prevents an object's motion.
- Applied Force: A force applied by a person or another object.
Non-Contact Forces
- Gravitational Force: A force that acts downward toward the center of the Earth, also known as weight. Weight = mg.
- Electrostatic Force: A force between electrically charged objects, which can be attractive or repulsive.
- Magnetic Force: A force between electrically charged or magnetized objects, which can be attractive or repulsive.
Balanced and Unbalanced Forces
- Balanced Forces: Equal in magnitude and opposite in direction, resulting in zero net force and stationary motion.
- Unbalanced Forces: Not equal in magnitude and opposite in direction, resulting in non-zero net force and moving motion.
Laws of Motion
- Law of Inertia: An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Inertia is a property of an object, not a force. It depends on mass. The greater the mass, the more inertia. Inertia relates to equilibrium (balance of forces).
- Law of Acceleration: A net force acting on an object causes the object to accelerate in the direction of the force. Acceleration is directly proportional to the net force and inversely proportional to the mass. Fnet = ma
Law of Interaction
- For every action, there is an equal and opposite reaction.
- Action and reaction forces act on different objects.
Work, Power, and Energy
- Work: The product of force and displacement in the direction of the force. W = Fd
- Power: The rate of doing work. P = W/t
- Energy: The capacity to do work
- Kinetic Energy (KE): The energy of motion. KE = 1/2mv²
- Potential Energy (PE): The energy of position related to height, stored energy. PE = mgh.
- Elastic Potential Energy (EPE): The energy stored in elastic materials (stretched or compressed). EPE = 1/2kx²
- Total Mechanical Energy (TME): The sum of kinetic and potential energies. TME = KE + PE
Waves
- Sound waves: disturbances that travel through a medium and transfer energy. Wave characteristics include wavelength, frequency, and amplitude. Sound waves travel faster in warmer mediums.
- Light waves: electromagnetic waves that do not require a medium to propagate. Properties include reflection, refraction, diffraction, and interference, with different colors due to wave properties. Colors are created when white light is separated into various colors.
Speed of Sound
- Speed of sound depends on the temperature of the medium; it's faster in warmer mediums.
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