Pre-med/IB-style, no-calculator questions on circular motion (uniform and non-uniform): centripetal acceleration/force, angular speed/period, banked curves, vertical circles, conical pendulums, turntables, orbits, apparent weight, and common misconceptions (centrifugal vs centripetal).
In uniform circular motion (constant speed), which vector always points toward the center of the circle?
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"Circular Motion","questions":[{"prompt":"In uniform circular motion (constant speed), which vector always points toward the center of the circle?","options":[{"label":"A","body":"Velocity","isCorrect":false},{"label":"B","body":"Displacement","isCorrect":false},{"label":"C","body":"Centripetal acceleration","isCorrect":true},{"label":"D","body":"Angular displacement","isCorrect":false},{"label":"E","body":"Momentum always points outward","isCorrect":false}],"explanation":"In uniform circular motion the acceleration is centripetal and points toward the center. Velocity is tangent to the circle, not inward, so A is wrong. Momentum follows velocity direction (tangent), so E is wrong."},{"prompt":"An object moves around a circle at constant speed. The net force on the object is best described as:","options":[{"label":"A","body":"Zero because speed is constant","isCorrect":false},{"label":"B","body":"Constant and tangent to the path","isCorrect":false},{"label":"C","body":"Toward the center of the circle","isCorrect":true},{"label":"D","body":"Away from the center of the circle","isCorrect":false},{"label":"E","body":"Always equal to the weight mg","isCorrect":false}],"explanation":"Even with constant speed, velocity changes direction, so acceleration is nonzero and points inward. Net force must point with acceleration, inward. It is not zero (A), not tangential (B), and not necessarily mg (E)."},{"prompt":"Which expression gives the magnitude of the centripetal acceleration of an object moving at speed v in a circle of radius r?","options":[{"label":"A","body":"a = vr","isCorrect":false},{"label":"B","body":"a = v/r","isCorrect":false},{"label":"C","body":"a = v^2/r","isCorrect":true},{"label":"D","body":"a = r^2/v","isCorrect":false},{"label":"E","body":"a = g/r","isCorrect":false}],"explanation":"Centripetal acceleration magnitude is a_c = v^2/r. The common trap is confusing v^2/r with v/r (which has wrong units for acceleration)."},{"prompt":"An object moves in a circle of radius r. If its speed doubles (v → 2v) while r stays the same, the centripetal acceleration changes by a factor of:","options":[{"label":"A","body":"1/4","isCorrect":false},{"label":"B","body":"1/2","isCorrect":false},{"label":"C","body":"2","isCorrect":false},{"label":"D","body":"4","isCorrect":true},{"label":"E","body":"8","isCorrect":false}],"explanation":"a_c = v^2/r, so doubling v makes v^2 four times larger, hence a_c increases by 4×. Not 2× (C) because acceleration depends on v^2, not v."},{"prompt":"An object moves in a circle at speed v. If the radius doubles (r → 2r) while v stays the same, the centripetal acceleration becomes:","options":[{"label":"A","body":"Twice as large","isCorrect":false},{"label":"B","body":"Half as large","isCorrect":true},{"label":"C","body":"Four times as large","isCorrect":false},{"label":"D","body":"Unchanged","isCorrect":false},{"label":"E","body":"Zero","isCorrect":false}],"explanation":"a_c = v^2/r, so doubling r halves a_c. It does not stay the same (D) because the curvature is gentler at larger radius."},{"prompt":"An object moves in a circle. If both speed and radius double (v → 2v and r → 2r), the centripetal acceleration changes by a factor of:","options":[{"label":"A","body":"1/2","isCorrect":false},{"label":"B","body":"1","isCorrect":false},{"label":"C","body":"2","isCorrect":true},{"label":"D","body":"4","isCorrect":false},{"label":"E","body":"8","isCorrect":false}],"explanation":"a_c = v^2/r → (2v)^2/(2r) = 4v^2/(2r) = 2(v^2/r). So it doubles."},{"prompt":"Which relation correctly links angular speed ω and period T for uniform circular motion?","options":[{"label":"A","body":"ω = T/2π","isCorrect":false},{"label":"B","body":"ω = 2πT","isCorrect":false},{"label":"C","body":"ω = 2π/T","isCorrect":true},{"label":"D","body":"ω = 1/(2πT)","isCorrect":false},{"label":"E","body":"ω = vT","isCorrect":false}],"explanation":"One full revolution is 2π radians and takes time T, so ω = (angular displacement)/time = 2π/T. Options A and D invert the relationship incorrectly."},{"prompt":"Which relation correctly links linear speed v and angular speed ω for motion in a circle of radius r?","options":[{"label":"A","body":"v = ω/r","isCorrect":false},{"label":"B","body":"v = ωr","isCorrect":true},{"label":"C","body":"v = r/ω","isCorrect":false},{"label":"D","body":"v = ω^2r","isCorrect":false},{"label":"E","body":"v = 2π/ω","isCorrect":false}],"explanation":"A point at radius r sweeps arc length s = rθ. Differentiating gives v = r(dθ/dt) = rω. ω^2r is centripetal acceleration, not speed."},{"prompt":"A wheel spins with constant angular speed ω. A point on the rim is at radius r. If the radius is doubled (r → 2r) while ω stays the same, which statement is correct?","options":[{"label":"A","body":"v doubles and a_c doubles","isCorrect":true},{"label":"B","body":"v doubles and a_c quadruples","isCorrect":false},{"label":"C","body":"v is unchanged and a_c doubles","isCorrect":false},{"label":"D","body":"v halves and a_c halves","isCorrect":false},{"label":"E","body":"Both v and a_c are unchanged","isCorrect":false}],"explanation":"With constant ω, v = ωr so v doubles. Also a_c = ω^2r so a_c doubles (linear in r). Quadrupling would be true if ω doubled, not r."},{"prompt":"An object moves at constant linear speed v around a circular track. If the radius doubles (r → 2r), what happens to the angular speed ω?","options":[{"label":"A","body":"ω doubles","isCorrect":false},{"label":"B","body":"ω halves","isCorrect":true},{"label":"C","body":"ω stays the same","isCorrect":false},{"label":"D","body":"ω quadruples","isCorrect":false},{"label":"E","body":"ω becomes zero","isCorrect":false}],"explanation":"ω = v/r. If r doubles while v stays fixed, ω halves. A common trap is to confuse this with the constant-ω case."},{"prompt":"An object moves in a circle at constant speed under a centripetal force. Over a small displacement along the circle, the work done by the centripetal force is:","options":[{"label":"A","body":"Positive","isCorrect":false},{"label":"B","body":"Negative","isCorrect":false},{"label":"C","body":"Zero","isCorrect":true},{"label":"D","body":"Equal to mv^2","isCorrect":false},{"label":"E","body":"Equal to the centripetal force times the radius","isCorrect":false}],"explanation":"Centripetal force is perpendicular to the instantaneous displacement (tangent), so W = Fd cos90° = 0. It changes direction of velocity, not the speed."},{"prompt":"In uniform circular motion (constant speed), the kinetic energy of the object is:","options":[{"label":"A","body":"Constant","isCorrect":true},{"label":"B","body":"Increasing","isCorrect":false},{"label":"C","body":"Decreasing","isCorrect":false},{"label":"D","body":"Zero because the object returns to its start point","isCorrect":false},{"label":"E","body":"Undefined because direction changes","isCorrect":false}],"explanation":"Kinetic energy depends on speed (v^2), not direction. If speed is constant, kinetic energy is constant, even though velocity changes direction."},{"prompt":"An object moves in a circle but speeds up. Which statement about its acceleration is correct?","options":[{"label":"A","body":"Acceleration is purely toward the center","isCorrect":false},{"label":"B","body":"Acceleration is purely tangent to the circle","isCorrect":false},{"label":"C","body":"Acceleration has both centripetal (radial) and tangential components","isCorrect":true},{"label":"D","body":"Acceleration is zero because it is moving smoothly","isCorrect":false},{"label":"E","body":"Acceleration must point outward when speeding up","isCorrect":false}],"explanation":"If speed changes, there is tangential acceleration. If direction changes (circular path), there is centripetal acceleration. Speeding up requires a tangential component in the direction of motion."},{"prompt":"In circular motion, which component of acceleration changes the object's speed (not its direction)?","options":[{"label":"A","body":"Centripetal (radial) acceleration","isCorrect":false},{"label":"B","body":"Tangential acceleration","isCorrect":true},{"label":"C","body":"Normal force","isCorrect":false},{"label":"D","body":"Centrifugal acceleration","isCorrect":false},{"label":"E","body":"Gravitational potential energy","isCorrect":false}],"explanation":"Tangential acceleration is parallel (or anti-parallel) to velocity, so it changes speed. Centripetal acceleration is perpendicular to velocity, so it changes direction only."},{"prompt":"A car turns left on a flat road at constant speed. The static friction force exerted by the road on the tires points:","options":[{"label":"A","body":"To the right (outward)","isCorrect":false},{"label":"B","body":"To the left (inward, toward the center of the turn)","isCorrect":true},{"label":"C","body":"Forward","isCorrect":false},{"label":"D","body":"Backward","isCorrect":false},{"label":"E","body":"Upward","isCorrect":false}],"explanation":"On a flat curve, static friction provides the inward (centripetal) force needed for the turn. Outward is a common sensation, but the real horizontal force is inward."},{"prompt":"A car is rounding a flat curve. Suddenly the road becomes perfectly icy (friction ≈ 0). At the instant the car reaches the ice, its horizontal acceleration is closest to:","options":[{"label":"A","body":"Inward toward the center","isCorrect":false},{"label":"B","body":"Outward away from the center","isCorrect":false},{"label":"C","body":"Tangent to the curve","isCorrect":false},{"label":"D","body":"Approximately zero","isCorrect":true},{"label":"E","body":"Equal to g","isCorrect":false}],"explanation":"With friction gone, there is (approximately) no horizontal force, so horizontal acceleration is ~0 at that instant. The car then continues with its current velocity direction (tangent), but the acceleration is what becomes zero."},{"prompt":"A passenger in a car turning left feels \"pushed\" to the right. In an inertial (non-rotating) frame, which statement is correct?","options":[{"label":"A","body":"A real outward force acts on the passenger","isCorrect":false},{"label":"B","body":"No horizontal force acts; the passenger moves outward on their own","isCorrect":false},{"label":"C","body":"The door/seat exerts an inward force on the passenger to make them follow the curve","isCorrect":true},{"label":"D","body":"Gravity provides the centripetal force","isCorrect":false},{"label":"E","body":"The passenger's mass decreases during the turn","isCorrect":false}],"explanation":"To curve left, the passenger must have inward (leftward) acceleration, so a real inward contact force from the car acts on them. The \"outward push\" is a sensation explained by inertia, not a real outward force in an inertial frame."},{"prompt":"The so-called \"centrifugal force\" is best described as:","options":[{"label":"A","body":"A real force that always acts outward in any frame","isCorrect":false},{"label":"B","body":"A fictitious (pseudo) force introduced when analyzing motion in a rotating (non-inertial) frame","isCorrect":true},{"label":"C","body":"The same as friction","isCorrect":false},{"label":"D","body":"The force that causes circular motion in an inertial frame","isCorrect":false},{"label":"E","body":"A force equal to mg in all situations","isCorrect":false}],"explanation":"In an inertial frame, circular motion is caused by inward net force. \"Centrifugal force\" appears only if you choose a rotating frame; it helps write Newton's laws in that non-inertial frame but is not a real interaction force."},{"prompt":"For fixed mass m and radius r, which change makes the required centripetal force increase by a factor of 4?","options":[{"label":"A","body":"Halving the speed","isCorrect":false},{"label":"B","body":"Doubling the speed","isCorrect":true},{"label":"C","body":"Doubling the radius","isCorrect":false},{"label":"D","body":"Halving the radius","isCorrect":false},{"label":"E","body":"Doubling the mass","isCorrect":false}],"explanation":"Centripetal force is F_c = mv^2/r. Doubling v makes v^2 four times larger, so F_c becomes 4×. Doubling mass only doubles F_c, and changing r affects F_c linearly (not by 4 unless r changes by 4)."},{"prompt":"A car travels on a frictionless banked curve at the special \"design speed.\" Which force provides the centripetal acceleration?","options":[{"label":"A","body":"Weight (mg) alone","isCorrect":false},{"label":"B","body":"Friction","isCorrect":false},{"label":"C","body":"The horizontal component of the normal force","isCorrect":true},{"label":"D","body":"The vertical component of the normal force","isCorrect":false},{"label":"E","body":"Centrifugal force","isCorrect":false}],"explanation":"On a frictionless banked curve, only weight and the normal act. The centripetal direction is horizontal toward the center, so it must come from the horizontal component of the normal force (not from mg which is vertical)."}]}"
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