Pre-med/IB-style questions that build from Newton's laws and free-body diagrams to friction, tension, work–energy, momentum/impulse, circular motion, and torque—focused on conceptual reasoning and common traps.
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src="https://entermedschool.org/embed/questions#{"title":"Mechanics Basics","questions":[{"prompt":"Which of the following is a vector quantity?","options":[{"label":"A","body":"Energy","isCorrect":false},{"label":"B","body":"Mass","isCorrect":false},{"label":"C","body":"Time","isCorrect":false},{"label":"D","body":"Force","isCorrect":true},{"label":"E","body":"Temperature","isCorrect":false}],"explanation":"A vector has magnitude and direction. Force requires a direction (push/pull direction). Energy, mass, time, and temperature are scalars."},{"prompt":"A hockey puck slides on nearly frictionless ice after being struck. After the stick loses contact, which best describes the puck's motion?","options":[{"label":"A","body":"It must quickly come to rest because no force acts on it.","isCorrect":false},{"label":"B","body":"It continues with constant velocity (same speed and direction).","isCorrect":true},{"label":"C","body":"It speeds up because motion continues automatically.","isCorrect":false},{"label":"D","body":"It moves in a circle because it has momentum.","isCorrect":false},{"label":"E","body":"Its acceleration stays constant and positive.","isCorrect":false}],"explanation":"Newton's 1st law: if the net external force is ~0, velocity stays constant. \"No force\" does not mean \"must stop\"; it means no change in velocity."},{"prompt":"Which property best measures an object's inertia?","options":[{"label":"A","body":"Weight","isCorrect":false},{"label":"B","body":"Mass","isCorrect":true},{"label":"C","body":"Speed","isCorrect":false},{"label":"D","body":"Acceleration","isCorrect":false},{"label":"E","body":"Volume","isCorrect":false}],"explanation":"Inertia is resistance to changes in velocity. Mass measures inertia; weight depends on gravity and can change with location."},{"prompt":"A car moves in a straight line at constant speed on a level road. What can you conclude about the net force on the car?","options":[{"label":"A","body":"Net force is forward and large.","isCorrect":false},{"label":"B","body":"Net force is backward and large.","isCorrect":false},{"label":"C","body":"Net force is zero.","isCorrect":true},{"label":"D","body":"Net force must equal the car's weight.","isCorrect":false},{"label":"E","body":"Net force must be zero only if the car is not moving.","isCorrect":false}],"explanation":"Constant velocity means zero acceleration, so by Newton's 2nd law the net force must be zero. Engine force can exist, but it's balanced by resistive forces."},{"prompt":"A book rests on a horizontal table with no other interactions. Which forces act on the book?","options":[{"label":"A","body":"Weight downward and normal force upward","isCorrect":true},{"label":"B","body":"Weight downward and friction force upward","isCorrect":false},{"label":"C","body":"Normal force downward and weight upward","isCorrect":false},{"label":"D","body":"Weight downward, normal upward, and a \"force of motion\" forward","isCorrect":false},{"label":"E","body":"Only weight downward (because the table is not a force)","isCorrect":false}],"explanation":"The book experiences gravity (weight) downward and the table's contact force (normal) upward. With no horizontal push, friction is zero and there is no extra \"force of motion.\""},{"prompt":"Two identical forces act separately on two carts on a frictionless track. Cart X has mass m; cart Y has mass 2m. Compared with cart X, cart Y's acceleration is:","options":[{"label":"A","body":"Twice as large","isCorrect":false},{"label":"B","body":"The same","isCorrect":false},{"label":"C","body":"Half as large","isCorrect":true},{"label":"D","body":"Four times as large","isCorrect":false},{"label":"E","body":"Zero because it is heavier","isCorrect":false}],"explanation":"Newton's 2nd law: a = F/m. Doubling mass with the same force halves the acceleration."},{"prompt":"An astronaut travels from Earth to the Moon. Which statement is correct?","options":[{"label":"A","body":"Her mass decreases because gravity is weaker.","isCorrect":false},{"label":"B","body":"Her weight decreases but her mass stays the same.","isCorrect":true},{"label":"C","body":"Her mass increases because the Moon has less air resistance.","isCorrect":false},{"label":"D","body":"Her weight stays the same because she is the same person.","isCorrect":false},{"label":"E","body":"Her mass and weight both become zero.","isCorrect":false}],"explanation":"Mass is an intrinsic property. Weight is the gravitational force (≈ mg), so it changes when g changes."},{"prompt":"Ignoring air resistance, two balls (one heavy, one light) are dropped from the same height at the same time. Which is true?","options":[{"label":"A","body":"The heavier one hits first because it has more weight.","isCorrect":false},{"label":"B","body":"The lighter one hits first because it has less inertia.","isCorrect":false},{"label":"C","body":"They hit at the same time because they have the same acceleration g.","isCorrect":true},{"label":"D","body":"They hit at the same time only if their masses are equal.","isCorrect":false},{"label":"E","body":"Neither hits because gravity cancels inertia.","isCorrect":false}],"explanation":"In free fall with no air resistance, all objects accelerate downward at the same rate g regardless of mass."},{"prompt":"A person stands on a scale inside an elevator moving upward at constant speed. Compared to standing still on the ground, the scale reading is:","options":[{"label":"A","body":"Greater","isCorrect":false},{"label":"B","body":"Smaller","isCorrect":false},{"label":"C","body":"The same","isCorrect":true},{"label":"D","body":"Zero","isCorrect":false},{"label":"E","body":"Impossible to know without the elevator's mass","isCorrect":false}],"explanation":"Constant speed means zero acceleration, so net force is zero and the normal force (scale reading) equals weight mg."},{"prompt":"Which pair is a Newton's 3rd law action–reaction pair?","options":[{"label":"A","body":"Weight of a book and the normal force on the book","isCorrect":false},{"label":"B","body":"Friction on a box and weight of the box","isCorrect":false},{"label":"C","body":"Earth pulls the apple downward and the apple pulls Earth upward","isCorrect":true},{"label":"D","body":"Tension in a rope and acceleration of the mass","isCorrect":false},{"label":"E","body":"Normal force on the book and friction on the book","isCorrect":false}],"explanation":"Action–reaction forces are equal and opposite and act on different objects. Earth-on-apple and apple-on-Earth are such a pair. Weight and normal on the book act on the same object, so they are not a 3rd-law pair."},{"prompt":"Why don't Newton's 3rd law force pairs cancel each other to give zero net force on a single object?","options":[{"label":"A","body":"Because action and reaction are not equal in magnitude.","isCorrect":false},{"label":"B","body":"Because one of them is always friction.","isCorrect":false},{"label":"C","body":"Because they act on different objects, not the same object.","isCorrect":true},{"label":"D","body":"Because they happen at different times.","isCorrect":false},{"label":"E","body":"Because net force depends on speed, not force.","isCorrect":false}],"explanation":"Newton's 3rd law pairs act on different bodies. Net force on one object is the sum of forces acting on that object only."},{"prompt":"A box is pushed to the right across a rough floor and is sliding. The friction force on the box points:","options":[{"label":"A","body":"To the right","isCorrect":false},{"label":"B","body":"To the left","isCorrect":true},{"label":"C","body":"Upward","isCorrect":false},{"label":"D","body":"Downward","isCorrect":false},{"label":"E","body":"Friction is zero because it is moving","isCorrect":false}],"explanation":"Kinetic friction opposes relative motion between surfaces. If the box slides right relative to the ground, friction on the box acts left."},{"prompt":"A block rests on a horizontal table with no horizontal forces applied. The static friction force on the block is:","options":[{"label":"A","body":"µsN","isCorrect":false},{"label":"B","body":"µkN","isCorrect":false},{"label":"C","body":"Zero","isCorrect":true},{"label":"D","body":"Equal to the weight mg","isCorrect":false},{"label":"E","body":"Always nonzero to prevent motion","isCorrect":false}],"explanation":"Static friction only appears as needed to prevent relative motion. With no tendency to slide, the required static friction is 0 (even though a maximum exists)."},{"prompt":"Which statement about static friction is correct?","options":[{"label":"A","body":"Static friction always equals µsN.","isCorrect":false},{"label":"B","body":"Static friction adjusts from 0 up to a maximum value µsN.","isCorrect":true},{"label":"C","body":"Static friction is always larger than kinetic friction for all materials.","isCorrect":false},{"label":"D","body":"Static friction acts in the direction of motion.","isCorrect":false},{"label":"E","body":"Static friction can only act upward.","isCorrect":false}],"explanation":"Static friction is self-adjusting: it matches the needed value to prevent slipping, up to the maximum f_s,max = µsN. It does not have to equal µsN."},{"prompt":"For most dry surfaces, compared to kinetic friction, the maximum static friction is typically:","options":[{"label":"A","body":"Smaller","isCorrect":false},{"label":"B","body":"Equal","isCorrect":false},{"label":"C","body":"Larger","isCorrect":true},{"label":"D","body":"Zero","isCorrect":false},{"label":"E","body":"Negative","isCorrect":false}],"explanation":"Usually µs > µk, meaning it takes more force to start motion than to keep sliding once moving. This is a common experimental observation in the simple friction model."},{"prompt":"A block rests on an incline at angle θ (no other forces). The normal force on the block equals:","options":[{"label":"A","body":"mg","isCorrect":false},{"label":"B","body":"mg sinθ","isCorrect":false},{"label":"C","body":"mg cosθ","isCorrect":true},{"label":"D","body":"mg tanθ","isCorrect":false},{"label":"E","body":"0","isCorrect":false}],"explanation":"The normal force balances the component of weight perpendicular to the plane, which is mg cosθ. It is smaller than mg unless θ = 0."},{"prompt":"For the same incline (angle θ), the component of the weight parallel to the plane is:","options":[{"label":"A","body":"mg","isCorrect":false},{"label":"B","body":"mg cosθ","isCorrect":false},{"label":"C","body":"mg sinθ","isCorrect":true},{"label":"D","body":"mg / sinθ","isCorrect":false},{"label":"E","body":"mg / cosθ","isCorrect":false}],"explanation":"Resolving weight into components gives mg sinθ along the plane (downhill) and mg cosθ perpendicular to the plane."},{"prompt":"As the angle θ of an incline increases (0° → 90°), which trend is correct?","options":[{"label":"A","body":"mg sinθ decreases and mg cosθ increases","isCorrect":false},{"label":"B","body":"Both mg sinθ and mg cosθ increase","isCorrect":false},{"label":"C","body":"mg sinθ increases and mg cosθ decreases","isCorrect":true},{"label":"D","body":"Both mg sinθ and mg cosθ decrease","isCorrect":false},{"label":"E","body":"Both stay constant because mg is constant","isCorrect":false}],"explanation":"sinθ grows from 0 to 1, so mg sinθ increases. cosθ drops from 1 to 0, so mg cosθ decreases."},{"prompt":"A box is pulled with a rope that makes an upward angle above the horizontal. Compared to pulling horizontally with the same rope tension, the friction force is usually:","options":[{"label":"A","body":"Larger, because the rope adds force","isCorrect":false},{"label":"B","body":"Smaller, because the upward component reduces the normal force","isCorrect":true},{"label":"C","body":"Unchanged, because friction is independent of normal force","isCorrect":false},{"label":"D","body":"Zero, because the rope lifts it completely","isCorrect":false},{"label":"E","body":"Impossible to compare without the rope length","isCorrect":false}],"explanation":"In the basic model, friction magnitude ≈ µN. An upward pull reduces N, so friction tends to decrease (making it easier to start/maintain motion)."},{"prompt":"A mass hangs motionless from a light vertical string. The tension in the string is:","options":[{"label":"A","body":"Zero","isCorrect":false},{"label":"B","body":"Equal to mg","isCorrect":true},{"label":"C","body":"Greater than mg","isCorrect":false},{"label":"D","body":"Less than mg","isCorrect":false},{"label":"E","body":"Equal to m/g","isCorrect":false}],"explanation":"If it's motionless, acceleration is zero, so net force is zero. The upward tension must balance weight mg."}]}"
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