Podcast
Questions and Answers
A cyclist travels 10 km north and then 5 km south. Which of these statements is true about the cyclist's journey?
A cyclist travels 10 km north and then 5 km south. Which of these statements is true about the cyclist's journey?
- The cyclist's displacement is 5 km south.
- The cyclist's displacement is 15 km north.
- The cyclist's total distance traveled is 5 km.
- The cyclist's displacement is 5 km north. (correct)
A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is the car's acceleration?
A car accelerates from rest to a speed of 20 m/s in 5 seconds. What is the car's acceleration?
- 5 m/s²
- 100 m/s²
- 4 m/s² (correct)
- 20 m/s²
Which of these statements correctly describes the relationship between the force applied to a spring and its extension?
Which of these statements correctly describes the relationship between the force applied to a spring and its extension?
- The force applied to a spring is inversely proportional to its extension.
- The force applied to a spring is directly proportional to its extension, up to the limit of proportionality. (correct)
- The extension of a spring is inversely proportional to the force applied.
- The extension of a spring is directly proportional to the force applied, regardless of the limit of proportionality.
A skydiver jumps out of a plane. As the skydiver falls, what happens to the force of air resistance acting on them?
A skydiver jumps out of a plane. As the skydiver falls, what happens to the force of air resistance acting on them?
A ball is thrown vertically upwards. Which of these statements is true about the ball's velocity and acceleration at the highest point of its trajectory?
A ball is thrown vertically upwards. Which of these statements is true about the ball's velocity and acceleration at the highest point of its trajectory?
A spring with a spring constant of 50 N/m is stretched by 0.2 m. What is the elastic potential energy stored in the spring?
A spring with a spring constant of 50 N/m is stretched by 0.2 m. What is the elastic potential energy stored in the spring?
Two identical springs are connected end-to-end. If a force is applied to the combination, what is the effective spring constant of the system?
Two identical springs are connected end-to-end. If a force is applied to the combination, what is the effective spring constant of the system?
Which of these is a scalar quantity?
Which of these is a scalar quantity?
Flashcards
Elastic Potential Energy
Elastic Potential Energy
Energy stored in an elastic object when deformed (stretched or compressed).
Scalar Quantity
Scalar Quantity
A measurement that has only magnitude, like distance or speed.
Vector Quantity
Vector Quantity
A measurement that has both magnitude and direction, like displacement or velocity.
Distance-Time Graph
Distance-Time Graph
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Velocity-Time Graph
Velocity-Time Graph
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Hooke's Law
Hooke's Law
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Terminal Velocity
Terminal Velocity
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Elastic Potential Energy Formula
Elastic Potential Energy Formula
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Study Notes
Elastic Potential Energy
- Elastic objects return to their original shape after deformation
- Work is done when stretching/squashing an elastic object
- Energy is stored as elastic potential energy
- Elastic Potential Energy = 1/2 x spring constant x (extension)²
Scalars and Vectors
- Scalars have only magnitude (size)
- Vectors have both magnitude and direction
- Examples of scalar quantities: distance, speed, time, mass, energy
- Examples of vector quantities: displacement, velocity, acceleration, force
Velocity and Acceleration
- Speed is the rate of change of distance
- Velocity is the rate of change of displacement
- Velocity = change in distance / change in time (v = Δs/Δt)
- Acceleration is the rate of change of velocity
- Acceleration = change in velocity / change in time (a = Δv/Δt = (v-u)/t)
- The gradient of a distance-time graph gives speed
- The gradient of a velocity-time graph gives acceleration
- The area under a velocity-time graph gives total distance travelled
Hooke's Law
- Extension of a spring is directly proportional to the force applied, up to the limit of proportionality.
- Force = spring constant x extension (F = ke)
- Stiffer springs have larger spring constants
Air Resistance
- The size of air resistance depends on the speed and area of the moving object perpendicular to the air flow
Terminal Velocity
- An object falling in air accelerates at first
- As speed increases, drag increases
- Resultant force decreases
- Acceleration decreases
- Object travels at a constant speed (terminal velocity)
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