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Questions and Answers
What is the unit of pressure?
What is the unit of pressure?
Atmospheric pressure increases with altitude.
Atmospheric pressure increases with altitude.
False
What is the formula for calculating pressure?
What is the formula for calculating pressure?
P = F / A
The force of attraction between two objects with mass is an example of a __________________ force.
The force of attraction between two objects with mass is an example of a __________________ force.
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Which of the following is an example of a contact force?
Which of the following is an example of a contact force?
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Match the following forces with their definitions:
Match the following forces with their definitions:
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Study Notes
Contact Forces
- Contact forces are forces that act through physical contact between two objects.
- Examples:
- Normal force (force exerted by a surface on an object)
- Frictional force (force that opposes motion between two surfaces)
- Tension force (force exerted by a stretched string or wire)
- Air resistance force (force that opposes motion through air)
Pressure Calculation
- Pressure is the force per unit area on an object.
- Pressure (P) = Force (F) / Area (A)
- Unit: Pascals (Pa)
- Formula: P = F / A
- Example: A force of 10 N is applied to a surface area of 2 m^2. What is the pressure?
- P = 10 N / 2 m^2 = 5 Pa
Atmospheric Pressure
- Atmospheric pressure is the pressure exerted by the weight of the air in the atmosphere.
- Also known as barometric pressure.
- Measured in units of pressure (e.g. Pascals, pounds per square inch).
- Standard atmospheric pressure at sea level: 101,325 Pa or 1 atm.
- Atmospheric pressure decreases with altitude.
Non-contact Forces
- Non-contact forces are forces that act without physical contact between two objects.
- Examples:
- Gravity (force of attraction between two objects with mass)
- Electromagnetic force (force between charged particles)
- Magnetic force (force between magnets)
- Nuclear force (force that holds nuclei together)
- Non-contact forces can act over long distances, unlike contact forces.
Contact Forces
- Contact forces are forces that act through physical contact between two objects, examples include:
- Normal force, which is the force exerted by a surface on an object
- Frictional force, which opposes motion between two surfaces
- Tension force, which is the force exerted by a stretched string or wire
- Air resistance force, which opposes motion through air
Pressure Calculation
- Pressure is the force per unit area on an object, calculated using the formula: P = F / A
- Unit of pressure is Pascals (Pa)
- Example: A force of 10 N applied to a surface area of 2 m^2 results in a pressure of 5 Pa
Atmospheric Pressure
- Atmospheric pressure is the pressure exerted by the weight of the air in the atmosphere, also known as barometric pressure
- Standard atmospheric pressure at sea level is 101,325 Pa or 1 atm
- Atmospheric pressure decreases with altitude
Non-contact Forces
- Non-contact forces are forces that act without physical contact between two objects, examples include:
- Gravity, the force of attraction between two objects with mass
- Electromagnetic force, the force between charged particles
- Magnetic force, the force between magnets
- Nuclear force, the force that holds nuclei together
- Non-contact forces can act over long distances, unlike contact forces
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Description
Understand contact forces, such as normal, frictional, tension, and air resistance forces, and learn how to calculate pressure using the formula P = F / A.
