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Questions and Answers
What is the unit of measurement for force?
What type of force is a push or pull that causes an object to change its motion or shape?
What is the formula for pressure?
What is the type of pressure exerted by the weight of the atmosphere on the Earth's surface?
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What is an example of a non-contact force?
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What happens to pressure if the force increases and the area remains the same?
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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 contact force (e.g. friction, normal force) or non-contact force (e.g. gravity, electromagnetic force)
Types of Forces
- Gravity: a force that attracts objects with mass towards each other
- Friction: a force that opposes motion between two surfaces in contact
- Normal force: a force exerted by a surface on an object that is in contact with it, usually perpendicular to the surface
- Tension: a force exerted by a stretched string or wire
- Air resistance: a force that opposes the motion of an object through the air
Pressure
- Force per unit area
- Measured in Pascals (Pa) or pounds per square inch (psi)
- Formula: Pressure = Force / Area (P = F / A)
Factors Affecting Pressure
- Force: increasing the force increases the pressure
- Area: decreasing the area increases the pressure
- Surface type: rough surfaces can increase pressure due to increased friction
Types of Pressure
- Atmospheric pressure: the pressure exerted by the weight of the atmosphere on the Earth's surface
- Hydrostatic pressure: the pressure exerted by a fluid (liquid or gas) on an object
- Gauge pressure: the difference between the pressure of a system and atmospheric pressure
Force
- A push or pull that causes an object to change its motion or shape, measured in Newtons (N)
- Can be classified into contact forces (e.g., friction, normal force) and non-contact forces (e.g., gravity, electromagnetic force)
Gravity
- A force that attracts objects with mass towards each other
Friction
- A force that opposes motion between two surfaces in contact
- Increases with the normal force between the surfaces and the surface roughness
Normal Force
- A force exerted by a surface on an object that is in contact with it, usually perpendicular to the surface
- Equal to the weight of the object when it is on a horizontal surface
Tension
- A force exerted by a stretched string or wire
- Can be calculated using the force and displacement of the string or wire
Air Resistance
- A force that opposes the motion of an object through the air
- Depends on the object's shape, size, and velocity
Pressure
- Force per unit area, measured in Pascals (Pa) or pounds per square inch (psi)
- Calculated using the formula: Pressure = Force / Area (P = F / A)
Factors Affecting Pressure
- Force: increasing the force increases the pressure
- Area: decreasing the area increases the pressure
- Surface type: rough surfaces can increase pressure due to increased friction
Types of Pressure
- Atmospheric pressure: the pressure exerted by the weight of the atmosphere on the Earth's surface
- Hydrostatic pressure: the pressure exerted by a fluid (liquid or gas) on an object
- Gauge pressure: the difference between the pressure of a system and atmospheric pressure
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Description
Learn about the concept of force, its measurement, and the different types of forces including gravity, friction, and normal force.
