Pre-med/IB-style questions on momentum (as a vector), impulse, force–time graphs, conservation conditions, center of mass motion, recoil/explosions, and 1D/2D collisions (elastic/inelastic). Designed to be conceptual and trap common misconceptions.
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src="https://entermedschool.org/embed/questions#{"title":"Momentum and Collisions","questions":[{"prompt":"Which statement best defines linear momentum?","options":[{"label":"A","body":"p = (1/2)mv^2, a scalar that depends on speed only","isCorrect":false},{"label":"B","body":"p = m·v (a vector), in the direction of velocity","isCorrect":true},{"label":"C","body":"p = F/Δt, the force per unit time","isCorrect":false},{"label":"D","body":"p = mg, a downward force due to gravity","isCorrect":false},{"label":"E","body":"p = m/a, a measure of inertia","isCorrect":false}],"explanation":"Linear momentum is defined as p = m·v (a vector). It points in the same direction as velocity. (1/2)mv^2 is kinetic energy, not momentum."},{"prompt":"Which of the following is a correct SI unit for momentum?","options":[{"label":"A","body":"kg·m^2/s^2","isCorrect":false},{"label":"B","body":"N/m","isCorrect":false},{"label":"C","body":"J/s","isCorrect":false},{"label":"D","body":"kg·m/s","isCorrect":true},{"label":"E","body":"N·m","isCorrect":false}],"explanation":"Momentum has units mass × velocity = kg·m/s. (kg·m^2/s^2) and N·m are joules (energy), and J/s is watt (power)."},{"prompt":"Impulse J is best described as:","options":[{"label":"A","body":"The rate of change of momentum","isCorrect":false},{"label":"B","body":"The product of mass and acceleration","isCorrect":false},{"label":"C","body":"The change in momentum of an object","isCorrect":true},{"label":"D","body":"The work done by a force","isCorrect":false},{"label":"E","body":"The distance traveled during a force","isCorrect":false}],"explanation":"Impulse equals the change in momentum: J = Δp (vector quantity). The rate of change of momentum is force: F = dp/dt (vector form)."},{"prompt":"A force acts for a time interval. On a force–time graph, the impulse delivered equals:","options":[{"label":"A","body":"The slope of the graph","isCorrect":false},{"label":"B","body":"The area under the curve","isCorrect":true},{"label":"C","body":"The maximum force value","isCorrect":false},{"label":"D","body":"The final force value minus the initial","isCorrect":false},{"label":"E","body":"The time at which force is largest","isCorrect":false}],"explanation":"Impulse is J = ∫F dt. Graphically, that is the area under the force–time curve, not the slope or the peak alone."},{"prompt":"Which statement about momentum is correct?","options":[{"label":"A","body":"Momentum can be conserved even when kinetic energy is not conserved.","isCorrect":true},{"label":"B","body":"Momentum is conserved only in perfectly elastic collisions.","isCorrect":false},{"label":"C","body":"Momentum is always zero if an object is moving in a circle.","isCorrect":false},{"label":"D","body":"Momentum is a scalar, so direction is irrelevant.","isCorrect":false},{"label":"E","body":"Momentum conservation requires that no forces act at all.","isCorrect":false}],"explanation":"Total momentum of an isolated system is conserved in any collision (elastic or inelastic) if net external impulse is zero. Kinetic energy can be transformed to internal energy in inelastic collisions."},{"prompt":"For a system of objects, linear momentum is conserved when:","options":[{"label":"A","body":"All forces are equal and opposite","isCorrect":false},{"label":"B","body":"Kinetic energy is conserved","isCorrect":false},{"label":"C","body":"Objects stick together","isCorrect":false},{"label":"D","body":"All internal forces are zero","isCorrect":false},{"label":"E","body":"The net external impulse on the system is zero","isCorrect":true}],"explanation":"Momentum conservation requires zero net external impulse (or negligible external impulse during the interaction). Internal forces can be large but cancel in the system sum."},{"prompt":"Two carts collide on a frictionless track. During the collision, cart A exerts a force on cart B. Compared to this force, the force cart B exerts on cart A is:","options":[{"label":"A","body":"Larger, because B resists more","isCorrect":false},{"label":"B","body":"Smaller, because A started the collision","isCorrect":false},{"label":"C","body":"Equal in magnitude and opposite in direction","isCorrect":true},{"label":"D","body":"In the same direction, because both move forward","isCorrect":false},{"label":"E","body":"Zero if the collision is perfectly inelastic","isCorrect":false}],"explanation":"Newton's 3rd law: interaction forces come in equal-and-opposite pairs, regardless of masses or whether they stick."},{"prompt":"A 2 kg cart and a 1 kg cart move with the same speed. Which has the larger momentum magnitude?","options":[{"label":"A","body":"The 2 kg cart","isCorrect":true},{"label":"B","body":"The 1 kg cart","isCorrect":false},{"label":"C","body":"They have the same momentum","isCorrect":false},{"label":"D","body":"Neither has momentum unless accelerating","isCorrect":false},{"label":"E","body":"Cannot be determined","isCorrect":false}],"explanation":"Momentum magnitude is p = mv. At the same speed, the larger mass has the larger momentum."},{"prompt":"Two objects have the same momentum magnitude. Object A has smaller mass than object B. Which statement about their speeds is correct?","options":[{"label":"A","body":"They must have the same speed","isCorrect":false},{"label":"B","body":"A must be slower","isCorrect":false},{"label":"C","body":"Speed is unrelated to momentum","isCorrect":false},{"label":"D","body":"A must be faster","isCorrect":true},{"label":"E","body":"A must be at rest","isCorrect":false}],"explanation":"For fixed momentum p = mv, a smaller mass requires a larger speed v = p/m."},{"prompt":"Two objects have the same momentum magnitude p but different masses. Which object has the larger kinetic energy?","options":[{"label":"A","body":"The larger mass","isCorrect":false},{"label":"B","body":"The smaller mass","isCorrect":true},{"label":"C","body":"They have the same kinetic energy","isCorrect":false},{"label":"D","body":"The one moving slower","isCorrect":false},{"label":"E","body":"Cannot be determined","isCorrect":false}],"explanation":"Using K = p^2/(2m), for the same p a smaller mass gives a larger kinetic energy. Momentum and kinetic energy scale differently."},{"prompt":"A ball of mass m moving right hits a wall and stops (does not bounce). The direction of the impulse on the ball from the wall is:","options":[{"label":"A","body":"To the right, because the ball was moving right","isCorrect":false},{"label":"B","body":"Upward, because the wall supports the ball","isCorrect":false},{"label":"C","body":"To the left, opposite the initial momentum","isCorrect":true},{"label":"D","body":"Zero, because the ball stops","isCorrect":false},{"label":"E","body":"Downward, because gravity acts","isCorrect":false}],"explanation":"Impulse equals change in momentum. The ball's momentum changes from +mv to 0, so Δp is to the left (negative direction)."},{"prompt":"A ball hits a wall and rebounds straight back with the same speed it had before impact. Compared with the case where it hits and stops, the magnitude of the impulse on the ball is:","options":[{"label":"A","body":"Smaller, because it bounces","isCorrect":false},{"label":"B","body":"The same","isCorrect":false},{"label":"C","body":"Zero, because speed is unchanged","isCorrect":false},{"label":"D","body":"Larger (in fact, double if speeds are equal)","isCorrect":true},{"label":"E","body":"Impossible to compare","isCorrect":false}],"explanation":"Stopping changes momentum from +mv to 0 (|Δp|=mv). Rebounding to −mv changes momentum by −2mv, so the impulse magnitude is 2mv, larger."},{"prompt":"Why does an airbag reduce injury in a crash (conceptually)?","options":[{"label":"A","body":"It reduces the change in momentum to nearly zero","isCorrect":false},{"label":"B","body":"It increases the speed change","isCorrect":false},{"label":"C","body":"It makes the collision perfectly elastic","isCorrect":false},{"label":"D","body":"It increases the impulse delivered","isCorrect":false},{"label":"E","body":"It increases the stopping time, reducing the average force for the same impulse","isCorrect":true}],"explanation":"For a given change in momentum, impulse is fixed (Δp). Average force is F_avg = Δp/Δt, so increasing Δt lowers average force."},{"prompt":"A car's crumple zone is designed to deform during a collision. The best physics reason is to:","options":[{"label":"A","body":"Increase the collision time to reduce the average force","isCorrect":true},{"label":"B","body":"Reduce the car's mass so momentum is conserved","isCorrect":false},{"label":"C","body":"Make kinetic energy conserved","isCorrect":false},{"label":"D","body":"Increase the car's final speed after impact","isCorrect":false},{"label":"E","body":"Eliminate the impulse on the passengers","isCorrect":false}],"explanation":"Crumple zones increase the time over which momentum changes, reducing the average (and peak) forces on occupants for the same Δp."},{"prompt":"Which type of collision is defined by conservation of BOTH momentum and kinetic energy (for the system)?","options":[{"label":"A","body":"Perfectly inelastic collision","isCorrect":false},{"label":"B","body":"Perfectly elastic collision","isCorrect":true},{"label":"C","body":"Any collision where objects stick","isCorrect":false},{"label":"D","body":"Any collision in which momentum is not conserved","isCorrect":false},{"label":"E","body":"A collision with friction present","isCorrect":false}],"explanation":"A perfectly elastic collision conserves both momentum and kinetic energy. In inelastic collisions, some kinetic energy becomes internal energy, though momentum can still be conserved."},{"prompt":"In a perfectly inelastic collision between two objects, which statement must be true?","options":[{"label":"A","body":"Kinetic energy is conserved","isCorrect":false},{"label":"B","body":"Both objects bounce apart","isCorrect":false},{"label":"C","body":"Momentum of each object is conserved","isCorrect":false},{"label":"D","body":"The objects move together with a common final velocity","isCorrect":true},{"label":"E","body":"No energy is transformed into heat or deformation","isCorrect":false}],"explanation":"Perfectly inelastic means the objects stick together and share a final velocity. Momentum of the system can be conserved, but kinetic energy is not conserved."},{"prompt":"A system starts at rest and explodes into two pieces in empty space (negligible external forces). What can you say about the two momenta immediately after the explosion?","options":[{"label":"A","body":"They must be equal (same vector)","isCorrect":false},{"label":"B","body":"The larger piece must have the larger momentum","isCorrect":false},{"label":"C","body":"They must be equal in magnitude and opposite in direction","isCorrect":true},{"label":"D","body":"Both momenta must be zero","isCorrect":false},{"label":"E","body":"They must both point upward","isCorrect":false}],"explanation":"Initial total momentum is zero. With no external impulse, total momentum remains zero, so the two momenta must add to zero: p1 + p2 = 0, meaning they are equal in magnitude and opposite in direction."},{"prompt":"A moving object explodes into fragments in midair. Neglecting air resistance during the short explosion time. The center of mass of the fragments will:","options":[{"label":"A","body":"Continue along the same trajectory it would have followed without the explosion","isCorrect":true},{"label":"B","body":"Stop instantly because momentum is redistributed","isCorrect":false},{"label":"C","body":"Move upward because internal forces push outward","isCorrect":false},{"label":"D","body":"Move in the direction of the largest fragment","isCorrect":false},{"label":"E","body":"Change direction randomly","isCorrect":false}],"explanation":"Internal forces cannot change the motion of the center of mass. With negligible external impulse during the explosion, the COM continues with the same velocity it had at that instant (same overall trajectory)."},{"prompt":"Two ice skaters push off each other from rest. Skater A has smaller mass than skater B. Immediately after pushing, which is correct?","options":[{"label":"A","body":"A has smaller speed because it is lighter","isCorrect":false},{"label":"B","body":"A has larger speed because momentum magnitudes must match","isCorrect":true},{"label":"C","body":"Both have the same speed because forces are equal","isCorrect":false},{"label":"D","body":"Both have zero momentum because they started at rest","isCorrect":false},{"label":"E","body":"B has larger acceleration because it is heavier","isCorrect":false}],"explanation":"Total momentum stays zero, so the skaters' momenta are equal and opposite. With p = mv, the smaller mass must have larger speed to have the same momentum magnitude."},{"prompt":"A gun fires a bullet horizontally. Ignoring external forces during firing, which statement is correct?","options":[{"label":"A","body":"Only the bullet has momentum after firing","isCorrect":false},{"label":"B","body":"Only the gun has momentum after firing","isCorrect":false},{"label":"C","body":"Gun and bullet momenta are in the same direction","isCorrect":false},{"label":"D","body":"Momentum is not conserved because there is an explosion","isCorrect":false},{"label":"E","body":"Gun and bullet momenta are equal in magnitude and opposite in direction","isCorrect":true}],"explanation":"The gun–bullet system starts with total momentum zero. After firing, momentum is conserved, so p_gun + p_bullet = 0: equal magnitudes, opposite directions (recoil)."}]}"
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