Podcast
Questions and Answers
Which of these is an example of a non-contact force?
Which of these is an example of a non-contact force?
- A person pushing a box.
- Friction slowing down a bicycle.
- Gravity pulling an apple from a tree. (correct)
- A spring pushing a door closed.
What kind of energy do we get from the sun?
What kind of energy do we get from the sun?
- Nuclear energy.
- Wind energy.
- Solar energy. (correct)
- Hydro energy.
Which of these forces keeps an object from moving when you first try to push it?
Which of these forces keeps an object from moving when you first try to push it?
- Sliding friction.
- Static friction. (correct)
- Rolling friction.
- Applied force.
What is the name for energy resources like coal and oil that cannot be easily replaced?
What is the name for energy resources like coal and oil that cannot be easily replaced?
What does a generator do in a power plant?
What does a generator do in a power plant?
What is the term for a force that squeezes or pushes something together?
What is the term for a force that squeezes or pushes something together?
Which energy source uses a turbine to generate electricity from water?
Which energy source uses a turbine to generate electricity from water?
What is binary code mainly used for?
What is binary code mainly used for?
What is the purpose of transmission lines?
What is the purpose of transmission lines?
Which of these is most similar to the type of friction experienced by a skateboard's wheels?
Which of these is most similar to the type of friction experienced by a skateboard's wheels?
Flashcards
External Force
External Force
A force that acts on an object from the outside causing it to move or change shape.
Internal Force
Internal Force
A force inside an object that resists external forces.
Non-Contact Force
Non-Contact Force
A force that can move things without touching them.
Contact Force
Contact Force
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Friction
Friction
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Static Friction
Static Friction
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Applied Force
Applied Force
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Spring Force
Spring Force
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Tension
Tension
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Compression
Compression
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Study Notes
- An external force acts on an object from the outside.
- An internal force resists external forces from within an object or structure.
- Non-contact forces, like gravity and magnetism, affect objects without touching them.
- Contact forces require physical contact to move an object.
- Friction makes it harder for objects to slide against each other.
Types of Friction
- Static friction keeps an object from moving.
- Sliding friction slows down two surfaces sliding against each other.
- Rolling friction slows down an object rolling over a surface.
- Applied force is a push or pull used to start, stop, or change the direction of an object's movement.
- Spring force is created by a compressed or stretched spring on an attached object.
- Tension pulls materials apart or stretches them.
- Compression happens when an object is squeezed or pushed together.
- Torsion is a twisting force.
- Shear force causes parts of a material to slide past each other in opposite directions.
Electrical Energy
- Electrical energy easily travels through wires from place to place
- Power plants create electricity from different energy sources.
Renewable Energy
- Sources like solar, wind, and hydro energy can be naturally replenished over time.
- Non-renewable energy sources, like coal, oil, and natural gas, cannot be replenished once used.
- Solar energy comes from the sun's rays.
- Wind energy is captured from the movement of wind.
- Hydro energy is captured from the flow of water.
- Nuclear energy comes from splitting uranium atoms.
- Turbines are large wheels that spin to turn mechanical energy into electrical energy.
- Generators convert mechanical energy into electrical energy.
- Transformers change the voltage of electricity for long-distance travel.
- Transmission lines are tall metal towers that carry high-voltage electricity over long distances.
- Binary code uses 0s and 1s to represent information in computers.
- Coding is the process of giving computers instructions using programming languages.
- LEDs, or Light-Emitting Diodes, are used in many electronic devices for light.
- Electromagnetic force is a non-contact force combining electrical and magnetic forces.
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