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Questions and Answers
What is the difference between distance and displacement?
What is the difference between distance and displacement?
- Distance is a scalar quantity, while displacement is a vector quantity.
- Both A and B (correct)
- Distance is the total path traveled, while displacement is the shortest distance between the starting and ending points.
- Distance is measured in meters, while displacement is measured in kilometers.
A car is traveling at a constant speed of 60 km/h. What is the car's acceleration?
A car is traveling at a constant speed of 60 km/h. What is the car's acceleration?
- It depends on the direction of the car.
- 1 km/h^2
- 0 km/h^2 (correct)
- 60 km/h^2
Which of the following is an example of an innovation in heat energy conversion to electrical energy?
Which of the following is an example of an innovation in heat energy conversion to electrical energy?
- Fossil fuel power plants
- Hydroelectric dams
- Wind turbines
- Solar panels (correct)
A block of ice is melting. Which method of heat transfer is primarily responsible for this process?
A block of ice is melting. Which method of heat transfer is primarily responsible for this process?
What does a distance-time graph tell you?
What does a distance-time graph tell you?
Flashcards
Balanced Force
Balanced Force
Forces that are equal in size and opposite in direction, resulting in no movement.
Displacement
Displacement
The shortest distance from the initial to the final position, including direction.
Vector Quantity
Vector Quantity
A quantity that has both magnitude and direction, like velocity or force.
Distance-Time Graph
Distance-Time Graph
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Methods of Heat Transfer
Methods of Heat Transfer
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Study Notes
Types of Force
- Forces are pushes or pulls that can change the motion of an object.
- Examples include gravity, friction, normal force, tension, and applied force.
Balanced/Unbalanced Force
- Balanced forces are equal in size and opposite in direction, resulting in no change in motion (e.g., an object resting on a table).
- Unbalanced forces are unequal in size and/or direction, resulting in a change in motion (e.g., an object accelerating).
Making Free Body Diagrams
- Free body diagrams represent all forces acting on an object.
- Draw a dot representing the object.
- Draw arrows to represent each force with the arrow pointing in the direction of the force.
- Label each arrow with the type of force and its magnitude (size).
Distance/Displacement
- Distance is the total length of the path travelled.
- Displacement is the straight-line distance from the starting point to the ending point.
Speed/Velocity
- Speed is the rate of change of distance.
- Velocity is the rate of change of displacement, and includes direction.
Vector and Scalar Quantity
- Vector quantities have both magnitude (size) and direction (e.g., velocity, force).
- Scalar quantities have only magnitude (e.g., speed, distance).
Distance-Time Graph
- A distance-time graph plots distance against time.
- The slope of the line represents speed; a steeper slope means faster speed.
- A horizontal line indicates no motion.
Heat and Temperature
- Heat is the transfer of thermal energy between objects at different temperatures.
- Temperature measures the average kinetic energy of the particles in a substance.
Methods of Heat Transfer
- Conduction happens through direct contact.
- Convection happens through the movement of fluids (liquids or gases).
- Radiation travels through electromagnetic waves.
Innovations on Heat Energy Conversion to Electrical Energy
- Innovations focus on converting heat energy into electrical energy, often involving technological advancements like solar panels, fuel cells, or thermoelectric generators with efficiency improvements in various forms.
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