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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?
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?
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?
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?
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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?
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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?
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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?
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Which of these is a scalar quantity?
Which of these is a scalar quantity?
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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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Description
Explore key concepts in physics including elastic potential energy, scalars, and vectors, as well as velocity and acceleration. This quiz covers fundamental principles and formulas that are essential for understanding motion and energy in physical systems.