Podcast
Questions and Answers
What is an example of a contact force?
What is an example of a contact force?
- Magnetic force
- Electrostatic force
- Gravity
- Tension (correct)
Which of the following correctly describes friction?
Which of the following correctly describes friction?
- A force that attracts two objects to each other
- A force that opposes motion and converts kinetic energy into heat (correct)
- A force that accelerates an object
- A force that only acts on stationary objects
According to Newton's Third Law of Motion, what occurs when a contact force acts between two objects?
According to Newton's Third Law of Motion, what occurs when a contact force acts between two objects?
- Both objects experience forces of equal size in opposite directions (correct)
- Only one object experiences a force
- Both objects experience different sized forces
- The forces produced are unable to cancel each other out
What unit is used to measure force?
What unit is used to measure force?
Which statement best describes air resistance?
Which statement best describes air resistance?
Flashcards
Force
Force
A push or a pull that can change an object's motion or shape.
Contact Force
Contact Force
A force that acts between objects in direct contact.
Non-contact Force
Non-contact Force
A force that acts between objects that are not in direct contact, such as gravity or magnetism.
Friction
Friction
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Tension
Tension
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Magnetic Field
Magnetic Field
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Magnetic Force
Magnetic Force
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Electrostatic Force
Electrostatic Force
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Gravitational Force
Gravitational Force
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Study Notes
Contact Forces
- Contact forces act between objects that are in physical touch.
- Examples include:
- Reaction force: An object at rest on a surface experiences a reaction force in the opposite direction to an action force. (e.g., a book on a table)
- Tension force: Objects stretched by a force like a cable experience tension force at each end. (e.g., a ceiling lamp)
- Friction force: Objects sliding past each other experience friction. (e.g., a box sliding down a slope)
- Air resistance: Objects moving through the air experience air resistance. (e.g., a skydiver)
- Newton's Third Law of Motion applies: For every action force, there is an equal and opposite reaction force. Both objects experience the same force size but in opposite directions.
Non-Contact Forces
- Non-contact forces act between objects that are not touching.
- Examples:
- Magnetic force: Magnetic materials experience a force in a magnetic field. Opposite poles attract, like poles repel.
- Electrostatic force: Charged particles experience a force in an electric field. Opposite charges attract, like charges repel.
- Gravitational force: Any mass in a gravitational field experiences a force. Masses are attracted to each other.
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