7 Questions
What is the unit of measurement for force?
Newtons (N)
What type of force occurs when two objects are not in physical contact?
Non-contact force
What is the force that opposes motion between two surfaces in contact?
Friction
What is the formula to calculate pressure?
Pressure = Force / Area
What happens to pressure when the surface area of an object decreases?
It increases
What is the force that causes an object to change its motion or shape?
Force
What is the force of attraction between two objects with mass?
Gravity
Study Notes
Science: Force and Pressure
Force
- A push or pull that causes an object to change its motion or shape
- Measured in Newtons (N)
- Can be either:
- Contact force: occurs when two objects are in physical contact (e.g. friction, normal force)
- Non-contact force: occurs when objects are not in physical contact (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 the motion of an object through the air
Pressure
- Force per unit area
- Measured in Pascals (Pa) or pounds per square inch (psi)
- Calculated using the formula: Pressure = Force / Area
- Depends on:
- Force applied
- Surface area of the object
Effects of Pressure
- Increases with:
- Increase in force
- Decrease in surface area
- Decreases with:
- Decrease in force
- Increase in surface area
- Examples:
- High pressure at the bottom of a deep swimming pool
- Low pressure at high altitudes
Science: Force and Pressure
Force
- Defined as a push or pull that causes an object to change its motion or shape
- Measured in units of Newtons (N)
- Classified into two types:
- Contact forces: occur when two objects are in physical contact (e.g. friction, normal force)
- Non-contact forces: occur when objects are not in physical contact (e.g. gravity, magnetic force)
Types of Forces
- Gravity: a force of attraction between two objects with mass
- 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
- 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
- Defined as force per unit area
- Measured in units of Pascals (Pa) or pounds per square inch (psi)
- Calculated using the formula: Pressure = Force / Area
- Influenced by:
- Force applied
- Surface area of the object
- Greater pressure results from:
- Increasing the force
- Decreasing the surface area
- Lower pressure results from:
- Decreasing the force
- Increasing the surface area
Effects of Pressure
- Examples of high pressure:
- At the bottom of a deep swimming pool
- Examples of low pressure:
- At high altitudes
Learn about the basics of force, including types of forces, contact and non-contact forces, and how it's measured in Newtons. Also, explore the concept of pressure and its relation to force.
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