Pre-med/IB-style conceptual questions on 1D/2D kinematics: distance vs displacement, speed vs velocity, acceleration, sign conventions, motion graphs (slope/area), constant-acceleration reasoning, free fall, projectiles, and relative motion.
A student walks 3 m east, then 4 m west along a straight line. Which statement is correct?
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src="https://entermedschool.org/embed/questions#{"title":"Kinematics Basics","questions":[{"prompt":"A student walks 3 m east, then 4 m west along a straight line. Which statement is correct?","options":[{"label":"A","body":"Distance = 1 m, displacement = 7 m east","isCorrect":false},{"label":"B","body":"Distance = 7 m, displacement = 1 m west","isCorrect":true},{"label":"C","body":"Distance = 7 m, displacement = 1 m east","isCorrect":false},{"label":"D","body":"Distance = 0 m, displacement = 0 m","isCorrect":false},{"label":"E","body":"Distance = 4 m, displacement = 3 m east","isCorrect":false}],"explanation":"Distance is total path length (3 + 4 = 7 m). Displacement is final minus initial position: 3 m east then 4 m back gives net 1 m west. Other options mix up path length with net change in position or direction."},{"prompt":"A runner completes one full lap of a circular track and returns to the starting point. Which is true for the entire lap?","options":[{"label":"A","body":"Average speed = 0, average velocity ≠ 0","isCorrect":false},{"label":"B","body":"Average speed > 0, average velocity = 0","isCorrect":true},{"label":"C","body":"Average speed = average velocity","isCorrect":false},{"label":"D","body":"Average speed = 0 and average velocity = 0","isCorrect":false},{"label":"E","body":"Average velocity is larger than average speed","isCorrect":false}],"explanation":"Returning to the start means displacement is zero, so average velocity (displacement/time) is zero. Distance traveled is not zero, so average speed (distance/time) is positive."},{"prompt":"Which of the following is a vector quantity?","options":[{"label":"A","body":"Speed","isCorrect":false},{"label":"B","body":"Distance","isCorrect":false},{"label":"C","body":"Displacement","isCorrect":true},{"label":"D","body":"Time","isCorrect":false},{"label":"E","body":"Mass","isCorrect":false}],"explanation":"A vector has magnitude and direction. Displacement requires direction; speed, distance, time, and mass are scalars (no direction)."},{"prompt":"Which statement about speed and velocity is correct?","options":[{"label":"A","body":"Speed includes direction; velocity does not.","isCorrect":false},{"label":"B","body":"Velocity can never be negative.","isCorrect":false},{"label":"C","body":"Speed is the magnitude of velocity and has no direction.","isCorrect":true},{"label":"D","body":"Velocity is always larger than speed.","isCorrect":false},{"label":"E","body":"Speed equals displacement divided by time.","isCorrect":false}],"explanation":"Speed is a scalar (magnitude only). Velocity is a vector (includes direction, so it can be negative in 1D). Speed relates to distance/time, not displacement/time."},{"prompt":"A car travels 60 km east in 1 hour, then 60 km west in 1 hour. Which statement is correct for the whole 2-hour trip?","options":[{"label":"A","body":"Average speed = 0 km/h, average velocity = 0 km/h","isCorrect":false},{"label":"B","body":"Average speed = 30 km/h, average velocity = 30 km/h east","isCorrect":false},{"label":"C","body":"Average speed = 120 km/h, average velocity = 0 km/h","isCorrect":false},{"label":"D","body":"Average speed = 60 km/h, average velocity = 0 km/h","isCorrect":true},{"label":"E","body":"Average speed = 0 km/h, average velocity = 60 km/h","isCorrect":false}],"explanation":"Total distance = 120 km in 2 h → average speed = 60 km/h. Net displacement is zero (back to start) → average velocity = 0."},{"prompt":"In 1D motion, which statement about a negative velocity is correct?","options":[{"label":"A","body":"Negative velocity means the object is slowing down.","isCorrect":false},{"label":"B","body":"Negative velocity means the object is speeding up.","isCorrect":false},{"label":"C","body":"Negative velocity means motion is opposite the chosen positive direction.","isCorrect":true},{"label":"D","body":"Negative velocity means the speed is negative.","isCorrect":false},{"label":"E","body":"Negative velocity is impossible in physics.","isCorrect":false}],"explanation":"The sign of velocity indicates direction relative to your chosen axis. Speed is the magnitude and cannot be negative; speeding up/slowing down depends on velocity and acceleration together."},{"prompt":"Acceleration is best defined as:","options":[{"label":"A","body":"Distance traveled per unit time","isCorrect":false},{"label":"B","body":"Displacement per unit time","isCorrect":false},{"label":"C","body":"Change in velocity per unit time","isCorrect":true},{"label":"D","body":"Change in distance per unit time","isCorrect":false},{"label":"E","body":"Velocity divided by displacement","isCorrect":false}],"explanation":"Acceleration measures how velocity changes with time (it includes changes in speed and/or direction). Options A and B define speed and velocity."},{"prompt":"Which situation shows zero velocity but nonzero acceleration?","options":[{"label":"A","body":"A car moving straight at constant 20 m/s","isCorrect":false},{"label":"B","body":"A ball at the highest point of its vertical throw (ignoring air)","isCorrect":true},{"label":"C","body":"A book resting on a table","isCorrect":false},{"label":"D","body":"A cart moving straight with constant speed and constant direction","isCorrect":false},{"label":"E","body":"A train moving on a straight track with constant velocity","isCorrect":false}],"explanation":"At the top of a throw, instantaneous velocity is zero, but gravitational acceleration still acts downward (about 9.8 m/s²). Resting objects have zero acceleration too (net force zero)."},{"prompt":"Which situation shows nonzero velocity but zero acceleration?","options":[{"label":"A","body":"A car increasing speed on a straight road","isCorrect":false},{"label":"B","body":"A cyclist turning a corner at constant speed","isCorrect":false},{"label":"C","body":"A train moving straight at constant velocity","isCorrect":true},{"label":"D","body":"A ball falling freely (ignoring air)","isCorrect":false},{"label":"E","body":"A rocket changing direction in space","isCorrect":false}],"explanation":"Zero acceleration means velocity is not changing. Straight-line constant-velocity motion has nonzero velocity but zero acceleration. Turning at constant speed still changes velocity direction, so acceleration is not zero."},{"prompt":"An object moves in a circle at constant speed. Which statement is correct?","options":[{"label":"A","body":"Acceleration is zero because speed is constant.","isCorrect":false},{"label":"B","body":"Velocity is constant because speed is constant.","isCorrect":false},{"label":"C","body":"The object accelerates because velocity direction changes.","isCorrect":true},{"label":"D","body":"Displacement after any time must be zero.","isCorrect":false},{"label":"E","body":"Distance traveled must be zero because it returns to the start each second.","isCorrect":false}],"explanation":"Velocity is a vector. In circular motion the direction of velocity changes continuously, so there is acceleration (toward the center) even if speed stays constant."},{"prompt":"On a displacement–time graph, the slope (gradient) represents:","options":[{"label":"A","body":"Acceleration","isCorrect":false},{"label":"B","body":"Velocity","isCorrect":true},{"label":"C","body":"Displacement","isCorrect":false},{"label":"D","body":"Distance","isCorrect":false},{"label":"E","body":"Momentum","isCorrect":false}],"explanation":"Slope is Δ(displacement)/Δ(time), which is velocity. Acceleration comes from changes in slope over time (curvature)."},{"prompt":"On a velocity–time graph, the slope (gradient) represents:","options":[{"label":"A","body":"Displacement","isCorrect":false},{"label":"B","body":"Speed","isCorrect":false},{"label":"C","body":"Acceleration","isCorrect":true},{"label":"D","body":"Distance","isCorrect":false},{"label":"E","body":"Kinetic energy","isCorrect":false}],"explanation":"Slope is Δ(velocity)/Δ(time), which is acceleration. Area under v–t relates to displacement, not slope."},{"prompt":"On a velocity–time graph, the area under the curve between two times represents:","options":[{"label":"A","body":"Acceleration","isCorrect":false},{"label":"B","body":"Displacement","isCorrect":true},{"label":"C","body":"Speed","isCorrect":false},{"label":"D","body":"Force","isCorrect":false},{"label":"E","body":"Momentum","isCorrect":false}],"explanation":"Area under v–t is ∫v dt, which gives displacement. If velocity changes sign, areas above and below the axis subtract, giving net displacement."},{"prompt":"On an acceleration–time graph, the area under the curve between two times represents:","options":[{"label":"A","body":"Change in velocity","isCorrect":true},{"label":"B","body":"Displacement","isCorrect":false},{"label":"C","body":"Average speed","isCorrect":false},{"label":"D","body":"Kinetic energy","isCorrect":false},{"label":"E","body":"Mass","isCorrect":false}],"explanation":"Area under a–t is ∫a dt = Δv. Displacement would require integrating velocity, not acceleration."},{"prompt":"A displacement–time graph is a horizontal line. What does this indicate?","options":[{"label":"A","body":"Constant nonzero velocity","isCorrect":false},{"label":"B","body":"Increasing acceleration","isCorrect":false},{"label":"C","body":"The object is at rest (velocity = 0)","isCorrect":true},{"label":"D","body":"The object is speeding up","isCorrect":false},{"label":"E","body":"The object must be moving in a circle","isCorrect":false}],"explanation":"Horizontal means displacement is not changing with time, so slope is zero → velocity is zero. It does not imply anything about circular motion."},{"prompt":"A displacement–time graph is a straight line with constant positive slope. What does this indicate?","options":[{"label":"A","body":"Constant positive velocity (and zero acceleration)","isCorrect":true},{"label":"B","body":"Constant positive acceleration","isCorrect":false},{"label":"C","body":"Constant negative velocity","isCorrect":false},{"label":"D","body":"Velocity increasing with time","isCorrect":false},{"label":"E","body":"Displacement must be zero","isCorrect":false}],"explanation":"Straight line means constant slope → constant velocity. If velocity is constant, acceleration is zero (in 1D)."},{"prompt":"A displacement–time graph curves upward (its slope increases with time). Which statement is correct?","options":[{"label":"A","body":"Velocity is constant and positive","isCorrect":false},{"label":"B","body":"Velocity is decreasing but still positive","isCorrect":false},{"label":"C","body":"Velocity is increasing (positive acceleration)","isCorrect":true},{"label":"D","body":"Acceleration must be zero because displacement increases","isCorrect":false},{"label":"E","body":"The object must be moving with constant speed","isCorrect":false}],"explanation":"Increasing slope means velocity is increasing. In 1D, increasing velocity with time corresponds to positive acceleration."},{"prompt":"A displacement–time graph increases but curves downward (its slope decreases with time while remaining positive). Which statement is correct?","options":[{"label":"A","body":"Velocity is positive but decreasing (negative acceleration)","isCorrect":true},{"label":"B","body":"Velocity is negative","isCorrect":false},{"label":"C","body":"Acceleration must be positive","isCorrect":false},{"label":"D","body":"The object is at rest","isCorrect":false},{"label":"E","body":"Displacement must be decreasing","isCorrect":false}],"explanation":"The graph still rises, so velocity is positive. But the slope is getting smaller, so velocity is decreasing; that means acceleration is negative (in the chosen positive direction)."},{"prompt":"A velocity–time graph is a horizontal line at v = +5 m/s. Which is true?","options":[{"label":"A","body":"Acceleration is +5 m/s^2","isCorrect":false},{"label":"B","body":"Acceleration is zero","isCorrect":true},{"label":"C","body":"Velocity is increasing","isCorrect":false},{"label":"D","body":"Displacement is zero","isCorrect":false},{"label":"E","body":"The object must be slowing down","isCorrect":false}],"explanation":"A horizontal v–t line has zero slope, so acceleration is zero. Displacement is not zero; it increases linearly (area under the graph)."},{"prompt":"A velocity–time graph is a straight line with positive slope. Which statement is correct?","options":[{"label":"A","body":"Acceleration is constant and positive","isCorrect":true},{"label":"B","body":"Acceleration is zero","isCorrect":false},{"label":"C","body":"Acceleration is constant and negative","isCorrect":false},{"label":"D","body":"Velocity must be constant","isCorrect":false},{"label":"E","body":"Displacement must be zero","isCorrect":false}],"explanation":"A straight line has constant slope, so acceleration is constant. Positive slope means positive acceleration."}]}"
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