Podcast
Questions and Answers
What is the definition of force?
What is the definition of force?
- A type of friction
- A type of motion
- An action that changes or maintains the motion of a body or object (correct)
- A type of energy
Gravity is an example of a contact force.
Gravity is an example of a contact force.
False (B)
What is the energy an object possesses due to its motion?
What is the energy an object possesses due to its motion?
Kinetic Energy
A stretched rubber band is an example of ______________________ energy.
A stretched rubber band is an example of ______________________ energy.
What type of force is friction?
What type of force is friction?
Match the following types of energy with their definitions:
Match the following types of energy with their definitions:
A moving car on a road is an example of potential energy.
A moving car on a road is an example of potential energy.
A ball held high above the ground is an example of ______________________ energy.
A ball held high above the ground is an example of ______________________ energy.
What type of force is air resistance?
What type of force is air resistance?
What is the difference between kinetic energy and potential energy?
What is the difference between kinetic energy and potential energy?
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Study Notes
Forces
- A force is an action that changes or maintains the motion of a body or object, and can be defined as a push or a pull.
- Forces can change an object's speed, direction, and shape.
Types of Forces
- Push and Pull Forces:
- Push: Kicking a ball
- Pull: Plucking a guitar string
- Non-contact and Contact Forces:
- Non-contact Force: A force applied to an object by another body that is not in direct contact with it (e.g. Gravity)
- Contact Force: A force between two objects that can only exist if they make direct contact with each other (e.g. Friction)
Examples of Forces
- Gravity
- Tension
- Normal (Contact) Force
- Kinetic Friction
- Static Friction
- Air Resistance (Drag)
- Elastic (Spring) Force
Energy
- Kinetic Energy:
- Definition: Energy an object possesses due to its motion
- Examples: A moving car on a road, a running person, wind moving a turbine
Types of Potential Energy
- Gravitational Potential Energy:
- Definition: Energy stored in an object due to its position or state
- Examples: A ball held high above the ground, water stored in a dam
- Elastic Potential Energy:
- Examples: A stretched rubber band, a compressed spring
- Chemical Potential Energy:
- Examples: Energy stored in food, batteries storing energy
Summary
- Kinetic Energy: Energy of motion
- Potential Energy: Stored energy based on position or state
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