Pre-med/IB-style questions on forces and Newtonian dynamics: free-body diagrams, net force, action–reaction, friction, tension/connected bodies, apparent weight (elevators/orbit), drag/terminal velocity, and circular motion (including banked curves). Difficulty increases gradually and focuses on conceptual traps.
A block rests on a smooth (frictionless) horizontal table while a horizontal force pulls it to the right. Which set of forces should appear on the block's free-body diagram?
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src="https://entermedschool.org/embed/questions#{"title":"Forces and Dynamics","questions":[{"prompt":"A block rests on a smooth (frictionless) horizontal table while a horizontal force pulls it to the right. Which set of forces should appear on the block's free-body diagram?","options":[{"label":"A","body":"Only the weight (mg) downward","isCorrect":false},{"label":"B","body":"Weight (mg) downward and the applied force to the right","isCorrect":false},{"label":"C","body":"Weight (mg) downward, normal force upward, and the applied force to the right","isCorrect":true},{"label":"D","body":"Weight (mg) downward, normal force upward, applied force to the right, and friction to the left","isCorrect":false},{"label":"E","body":"Normal force upward and friction to the left only","isCorrect":false}],"explanation":"A free-body diagram includes only forces acting ON the block. On a frictionless table there is no friction, but there is still weight downward and a normal force upward, plus the applied pull."},{"prompt":"A glider moves in a straight line at constant velocity on a frictionless air track. Which statement about the net force on the glider is correct?","options":[{"label":"A","body":"The net force must point in the direction of motion.","isCorrect":false},{"label":"B","body":"The net force must point opposite the direction of motion.","isCorrect":false},{"label":"C","body":"The net force is zero.","isCorrect":true},{"label":"D","body":"The net force equals the glider's weight.","isCorrect":false},{"label":"E","body":"The net force depends on how fast it is moving.","isCorrect":false}],"explanation":"Constant velocity means acceleration is zero. By Newton's 2nd law (ΣF = ma), zero acceleration implies the net force is zero (even though individual forces like weight/normal may exist)."},{"prompt":"An object has acceleration 0. Which of the following must be true?","options":[{"label":"A","body":"No forces act on the object.","isCorrect":false},{"label":"B","body":"Only one force acts on the object.","isCorrect":false},{"label":"C","body":"The net (resultant) force on the object is zero.","isCorrect":true},{"label":"D","body":"The object must be at rest.","isCorrect":false},{"label":"E","body":"The object must be moving in a circle.","isCorrect":false}],"explanation":"Acceleration 0 means ΣF = 0. Forces can still act (e.g., weight and normal), but they must balance. The object can be at rest OR moving with constant velocity."},{"prompt":"A person pushes on a wall with a horizontal force. Which is the Newton's 3rd law reaction force to the push on the wall?","options":[{"label":"A","body":"The wall's weight acting downward","isCorrect":false},{"label":"B","body":"The friction force on the person's shoes","isCorrect":false},{"label":"C","body":"The wall pushes on the person with equal magnitude in the opposite direction","isCorrect":true},{"label":"D","body":"The normal force on the wall from the ground","isCorrect":false},{"label":"E","body":"The person's weight acting downward","isCorrect":false}],"explanation":"Newton's 3rd law pairs are equal and opposite forces acting on different objects. If the person pushes on the wall, the wall pushes back on the person with equal magnitude and opposite direction."},{"prompt":"A block is at rest on a rough incline and would slide down if friction were absent. The static friction force on the block points:","options":[{"label":"A","body":"Down the slope","isCorrect":false},{"label":"B","body":"Up the slope","isCorrect":true},{"label":"C","body":"Perpendicular to the slope, away from the surface","isCorrect":false},{"label":"D","body":"Perpendicular to the slope, into the surface","isCorrect":false},{"label":"E","body":"Always vertically upward","isCorrect":false}],"explanation":"Static friction opposes the tendency of relative motion. Here gravity's component along the slope tends to pull the block down the slope, so static friction acts up the slope to prevent slipping."},{"prompt":"On a frictionless surface, a constant net force F produces acceleration a on a mass m. If the net force becomes 2F (same m), the acceleration becomes:","options":[{"label":"A","body":"a/2","isCorrect":false},{"label":"B","body":"a","isCorrect":false},{"label":"C","body":"2a","isCorrect":true},{"label":"D","body":"4a","isCorrect":false},{"label":"E","body":"It depends on the object's speed","isCorrect":false}],"explanation":"Newton's 2nd law gives a = F/m. Doubling F while keeping m constant doubles the acceleration."},{"prompt":"Two forces of equal magnitude F act on an object, one east and one north. The magnitude of the net force is:","options":[{"label":"A","body":"0","isCorrect":false},{"label":"B","body":"F","isCorrect":false},{"label":"C","body":"√2 F","isCorrect":true},{"label":"D","body":"2F","isCorrect":false},{"label":"E","body":"F/√2","isCorrect":false}],"explanation":"Perpendicular vectors add via Pythagoras: |F_net| = √(F^2 + F^2) = √2 F. It must be larger than F but smaller than 2F."},{"prompt":"A 10 N force acts east and a 10 N force acts west on an object. The object is initially moving east. What can you conclude about its acceleration at that instant?","options":[{"label":"A","body":"It accelerates east because it is moving east.","isCorrect":false},{"label":"B","body":"It accelerates west because friction must exist.","isCorrect":false},{"label":"C","body":"Its acceleration is zero because the net force is zero.","isCorrect":true},{"label":"D","body":"Its acceleration equals g.","isCorrect":false},{"label":"E","body":"It must stop immediately.","isCorrect":false}],"explanation":"Equal and opposite forces cancel, so ΣF = 0 and a = 0. Motion can continue at constant velocity even with zero acceleration."},{"prompt":"Which statement best defines an object's weight?","options":[{"label":"A","body":"The amount of matter in the object","isCorrect":false},{"label":"B","body":"The gravitational force acting on the object","isCorrect":true},{"label":"C","body":"The object's resistance to acceleration","isCorrect":false},{"label":"D","body":"The object's momentum divided by time","isCorrect":false},{"label":"E","body":"The object's volume","isCorrect":false}],"explanation":"Weight is a force caused by gravity (near Earth, approximately mg). Mass measures amount of matter/inertia and does not change with location."},{"prompt":"An elevator is moving upward but slowing down. Compared with mg, the normal force on a passenger (scale reading) is:","options":[{"label":"A","body":"Greater than mg","isCorrect":false},{"label":"B","body":"Equal to mg","isCorrect":false},{"label":"C","body":"Less than mg","isCorrect":true},{"label":"D","body":"Zero","isCorrect":false},{"label":"E","body":"Negative","isCorrect":false}],"explanation":"Moving up but slowing means acceleration is downward. From N − mg = ma (up positive), a is negative, so N < mg. You feel lighter."},{"prompt":"An elevator is moving downward but slowing down. Compared with mg, the normal force on a passenger (scale reading) is:","options":[{"label":"A","body":"Greater than mg","isCorrect":true},{"label":"B","body":"Equal to mg","isCorrect":false},{"label":"C","body":"Less than mg","isCorrect":false},{"label":"D","body":"Zero","isCorrect":false},{"label":"E","body":"It must equal the passenger's mass","isCorrect":false}],"explanation":"Moving down but slowing means acceleration is upward. With up positive, a > 0, so N − mg = ma > 0 and N > mg. You feel heavier."},{"prompt":"A block rests on a rough incline. The maximum possible static friction is f_s,max = µ_s N. As the incline angle θ increases (same block and surface), f_s,max generally:","options":[{"label":"A","body":"Increases because gravity increases","isCorrect":false},{"label":"B","body":"Decreases because the normal force decreases","isCorrect":true},{"label":"C","body":"Stays constant because µ_s is constant","isCorrect":false},{"label":"D","body":"Becomes equal to mg","isCorrect":false},{"label":"E","body":"Becomes equal to µ_s mg for all angles","isCorrect":false}],"explanation":"On an incline, N = mg cosθ. As θ increases, cosθ decreases, so N decreases and thus f_s,max = µ_s N decreases."},{"prompt":"A block sits on a horizontal rough surface. If you place an extra mass on top, increasing the normal force, the maximum static friction between block and surface:","options":[{"label":"A","body":"Increases","isCorrect":true},{"label":"B","body":"Decreases","isCorrect":false},{"label":"C","body":"Stays the same","isCorrect":false},{"label":"D","body":"Becomes zero because contact area increases","isCorrect":false},{"label":"E","body":"Depends only on speed","isCorrect":false}],"explanation":"In the basic model, f_s,max = µ_s N. Adding mass increases N, so the maximum possible static friction increases."},{"prompt":"A block is sliding to the right across a rough horizontal surface. The kinetic friction force on the block 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":"Kinetic friction is zero when moving","isCorrect":false}],"explanation":"Kinetic friction opposes the direction of relative sliding. If the block slides right relative to the surface, friction on the block acts left."},{"prompt":"A heavy crate rests on a rough horizontal floor. No horizontal forces act on it. Which is true about the static friction force on the crate?","options":[{"label":"A","body":"It equals µ_s N automatically.","isCorrect":false},{"label":"B","body":"It equals µ_k N automatically.","isCorrect":false},{"label":"C","body":"It is zero.","isCorrect":true},{"label":"D","body":"It points to the left.","isCorrect":false},{"label":"E","body":"It points to the right.","isCorrect":false}],"explanation":"Static friction adjusts to whatever value is needed to prevent slipping, up to a maximum. With no tendency to move horizontally, the required static friction is 0 (even though the maximum is not 0)."},{"prompt":"Two identical blocks (each mass m) are connected by a light rope on a frictionless surface. A horizontal force F pulls the right block to the right. What is the tension in the rope?","options":[{"label":"A","body":"F","isCorrect":false},{"label":"B","body":"F/2","isCorrect":true},{"label":"C","body":"2F","isCorrect":false},{"label":"D","body":"F/4","isCorrect":false},{"label":"E","body":"It must be zero because the surface is frictionless","isCorrect":false}],"explanation":"The two-block system has total mass 2m, so a = F/(2m). The left block is pulled only by tension, so T = m a = m·F/(2m) = F/2."},{"prompt":"Two blocks of masses m and 2m are connected by a light rope on a frictionless surface. A horizontal force F pulls the SMALLER block (m) to the right. What is the rope tension?","options":[{"label":"A","body":"F/3","isCorrect":false},{"label":"B","body":"F/2","isCorrect":false},{"label":"C","body":"2F/3","isCorrect":true},{"label":"D","body":"F","isCorrect":false},{"label":"E","body":"3F/2","isCorrect":false}],"explanation":"Total mass is 3m, so a = F/(3m). The 2m block is accelerated only by tension: T = (2m)a = 2m·F/(3m) = 2F/3."},{"prompt":"Two blocks of masses m and 2m are connected by a light rope on a frictionless surface. A horizontal force F pulls the LARGER block (2m) to the right. What is the rope tension?","options":[{"label":"A","body":"F/3","isCorrect":true},{"label":"B","body":"F/2","isCorrect":false},{"label":"C","body":"2F/3","isCorrect":false},{"label":"D","body":"F","isCorrect":false},{"label":"E","body":"3F/2","isCorrect":false}],"explanation":"Total mass is still 3m, so a = F/(3m). Now the smaller block m is pulled only by tension, so T = m a = m·F/(3m) = F/3."},{"prompt":"For the two-block system with masses m and 2m on a frictionless surface, the same external force F is applied. In which case is the rope tension larger?","options":[{"label":"A","body":"Larger when pulling the 2m block","isCorrect":false},{"label":"B","body":"Larger when pulling the m block","isCorrect":true},{"label":"C","body":"The same in both cases","isCorrect":false},{"label":"D","body":"Zero in both cases","isCorrect":false},{"label":"E","body":"It depends on the blocks' speeds, not masses","isCorrect":false}],"explanation":"Pulling the m block gives T = 2F/3, while pulling the 2m block gives T = F/3. Same acceleration occurs, but the tension differs because it must accelerate the \"other\" block."},{"prompt":"Two blocks m1 and m2 are connected by a light rope on a frictionless surface. A horizontal force F is applied to either block to pull the system. The system's acceleration magnitude is:","options":[{"label":"A","body":"Different depending on which block is pulled","isCorrect":false},{"label":"B","body":"Always F/m1","isCorrect":false},{"label":"C","body":"Always F/m2","isCorrect":false},{"label":"D","body":"F/(m1 + m2)","isCorrect":true},{"label":"E","body":"Zero because internal forces cancel","isCorrect":false}],"explanation":"Treat both blocks as one system: the net external horizontal force is F and total mass is (m1 + m2), so a = F/(m1 + m2). Internal tension forces cancel within the system."}]}"
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