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Questions and Answers
A car accelerates uniformly from rest. Which of the following statements is correct about the car's motion?
A car accelerates uniformly from rest. Which of the following statements is correct about the car's motion?
- The car's velocity increases by the same amount in each equal time interval. (correct)
- The car covers the same distance in each equal time interval.
- The car experiences no net force.
- The car's position changes linearly with time.
A projectile is launched at an angle into the air. Neglecting air resistance, what remains constant during its flight?
A projectile is launched at an angle into the air. Neglecting air resistance, what remains constant during its flight?
- The horizontal component of velocity (correct)
- The projectile's speed
- The direction of the acceleration
- The vertical component of velocity
A box is sliding down an inclined plane at a constant speed. Which of the following statements must be true?
A box is sliding down an inclined plane at a constant speed. Which of the following statements must be true?
- The net force on the box is directed down the plane.
- The net force on the box is zero. (correct)
- There is no friction between the box and the plane.
- The force of gravity is the only force acting on the box.
Two vectors, A and B, have magnitudes of 5 and 8 units respectively. Which of the following could NOT be the magnitude of their resultant vector?
Two vectors, A and B, have magnitudes of 5 and 8 units respectively. Which of the following could NOT be the magnitude of their resultant vector?
An object is thrown vertically upwards. Which of the following is correct about the sign of velocity and acceleration at the highest point?
An object is thrown vertically upwards. Which of the following is correct about the sign of velocity and acceleration at the highest point?
A student walks 5 meters east, then 12 meters north. What is the magnitude of the student's displacement?
A student walks 5 meters east, then 12 meters north. What is the magnitude of the student's displacement?
A force of 10 N is applied to a 2 kg mass. What is the acceleration of the mass?
A force of 10 N is applied to a 2 kg mass. What is the acceleration of the mass?
Which of the following scenarios violates Newton's First Law?
Which of the following scenarios violates Newton's First Law?
Flashcards
Motion
Motion
Change in an object's position over time.
Displacement (Δx)
Displacement (Δx)
Change in position, calculated as final position - initial position.
Velocity (v)
Velocity (v)
Rate of change of position, calculated as Δx / Δt.
Acceleration (α)
Acceleration (α)
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Newton's First Law
Newton's First Law
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Newton's Second Law
Newton's Second Law
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Newton's Third Law
Newton's Third Law
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Free Body Diagram
Free Body Diagram
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Study Notes
Physics Study Guide
- Chapter 1: Concepts of Motion
- Motion: Change in an object's position over time.
- Position (Δx): Location relative to a reference point.
- Displacement (Δx): Change in position, calculated as final position minus initial position.
- Uniform Motion: Equal displacement per time interval.
- Accelerated Motion: Increasing or decreasing displacement per time interval.
- Position vs. Time Graph: Slope = velocity.
- Velocity vs. Time Graph: Slope = acceleration.
- Scalars: Magnitude only (e.g., speed, distance, mass).
- Vectors: Magnitude and direction (e.g., velocity, displacement, force).
Chapter 2: Kinematics in One Dimension
- Velocity (v): Rate of change of position. v = Δx / Δt
- Acceleration (a): Rate of change of velocity. a = Δv / Δt
- Equations of Motion (Constant Acceleration):
- v = v₀ + at
- x = x₀ + v₀t + ½at²
- v² = v₀² + 2a(x - x₀)
- Free Fall: Motion under gravity alone; a = g = 9.8 m/s². Equations remain the same, with acceleration replaced by g.
Chapter 3: Vectors and Motion in Two Dimensions
- Vector Components: Any vector can be decomposed into components. Aₓ = A cosθ Aᵧ = A sinθ
- Adding Vectors: Graphically (tip-to-tail method) or algebraically. Rₓ = Aₓ + Bₓ , Rᵧ = Aᵧ + Bᵧ , R = √(Rₓ² + Rᵧ²) , θ = tan⁻¹(Rᵧ / Rₓ)
- Projectile Motion:
- Horizontal motion: x = v₀ₓt
- Vertical motion: y = v₀ᵧt - ½gt²
- Time of flight: t = (2v₀ᵧ) / g
Chapter 4: Newton's Laws of Motion
- Newton's First Law (Inertia): An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
- Newton's Second Law (Force & Acceleration): F = ma. The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
- Newton's Third Law (Action-Reaction): For every action, there is an equal and opposite reaction.
- Free Body Diagrams: Illustrate all forces acting on an object.
- Graphs and Visual Representations:
- Position vs. Time Graphs (Slope = velocity)
- Velocity vs. Time Graphs (Slope = acceleration, Area = displacement)
- Acceleration vs. Time Graphs (Area = change in velocity)
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