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Questions and Answers
What is the unit of measurement for force?
Which type of force occurs when two objects are not physically touching?
What is the formula to calculate pressure?
What happens to pressure if the force increases and the area remains the same?
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Which of the following is an example of a real-world application of pressure in fluids?
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What is the relationship between pressure and area, if the force is constant?
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Study Notes
Force
- A push or pull that causes an object to change its motion or shape
- Measured in Newtons (N)
- Can be either contact or non-contact
- Contact force: occurs when two objects are physically touching (e.g. friction, normal force)
- Non-contact force: occurs when two objects are not physically touching (e.g. gravity, magnetic force)
Types of Forces
- Gravity: force of attraction between two objects with mass
- Friction: force that opposes motion between two surfaces in contact
- Normal force: force exerted by a surface on an object that is in contact with it
- Tension: force exerted by a stretched string or wire
- Air resistance: force that opposes motion through the air
- Thrust: force that propels an object forward
Pressure
- Force exerted per unit area
- Measured in Pascals (Pa) or pounds per square inch (psi)
- Calculated using the formula: Pressure = Force / Area
- Units:
- Pascals (Pa): 1 Pa = 1 N/m^2
- Pounds per square inch (psi): 1 psi = 6894.76 Pa
Pressure and Force Relationships
- Pressure increases as force increases
- Pressure decreases as area increases
- Pressure remains the same if force and area are proportional
Real-World Applications
- Pressure in fluids: used in hydraulic systems, pumps, and medical devices
- Force in machines: used in levers, pulleys, and gears
- Pressure in the atmosphere: affects weather and climate
Force
- A force is a push or pull that changes an object's motion or shape
- Force is measured in Newtons (N)
- There are two types of forces: contact and non-contact
Contact Force
- Occurs when two objects physically touch
- Examples: friction, normal force
Non-Contact Force
- Occurs when two objects are not physically touching
- Examples: gravity, magnetic force
Types of Forces
Gravity
- A force of attraction between two objects with mass
Friction
- A force opposing motion between two surfaces in contact
Normal Force
- A force exerted by a surface on an object in contact with it
Tension
- A force exerted by a stretched string or wire
Air Resistance
- A force opposing motion through the air
Thrust
- A force propelling an object forward
Pressure
- Force exerted per unit area
- Measured in Pascals (Pa) or pounds per square inch (psi)
- Calculated using the formula: Pressure = Force / Area
Units of Pressure
- 1 Pa = 1 N/m^2
- 1 psi = 6894.76 Pa
Pressure Relationships
- Pressure increases with force
- Pressure decreases with area
- Pressure remains the same if force and area are proportional
Real-World Applications
Pressure in Fluids
- Used in hydraulic systems, pumps, and medical devices
Force in Machines
- Used in levers, pulleys, and gears
Atmospheric Pressure
- Affects weather and climate
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Description
Learn about force, its measurement, and different types of forces, including contact and non-contact forces, gravity, and friction.
