Pre-med/IB-style questions covering Newton's law of gravitation, gravitational field/weight, potential energy and work, satellites/orbits (Kepler relationships), escape speed, and common conceptual traps (field vs potential, weightlessness, scaling with distance).
Two point masses m1 and m2 are separated by distance r. Which expression gives the magnitude of the gravitational force between them?
Source: entermedschool.org
<!-- Gravitation — EnterMedSchool -->
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src="https://entermedschool.org/embed/questions#{"title":"Gravitation","questions":[{"prompt":"Two point masses m1 and m2 are separated by distance r. Which expression gives the magnitude of the gravitational force between them?","options":[{"label":"A","body":"F = G(m1 + m2)/r","isCorrect":false},{"label":"B","body":"F = Gm1m2/r","isCorrect":false},{"label":"C","body":"F = Gm1m2/r^2","isCorrect":true},{"label":"D","body":"F = (1/2)Gm1m2/r^2","isCorrect":false},{"label":"E","body":"F = G(m1 − m2)/r^2","isCorrect":false}],"explanation":"Newton's law of universal gravitation is F = Gm1m2/r^2. The force depends on the product of the masses and the inverse square of their separation (not 1/r and not on m1±m2)."},{"prompt":"If the distance between two masses is doubled (r → 2r), the gravitational force magnitude becomes:","options":[{"label":"A","body":"Twice as large","isCorrect":false},{"label":"B","body":"Half as large","isCorrect":false},{"label":"C","body":"One quarter as large","isCorrect":true},{"label":"D","body":"Four times as large","isCorrect":false},{"label":"E","body":"Unchanged","isCorrect":false}],"explanation":"Because F ∝ 1/r^2, doubling r makes the force 1/(2^2) = 1/4 of the original. Many confuse inverse-square with inverse."},{"prompt":"If both masses in a two-body system are doubled (m1 → 2m1 and m2 → 2m2) while r stays the same, the gravitational force becomes:","options":[{"label":"A","body":"Twice as large","isCorrect":false},{"label":"B","body":"Four times as large","isCorrect":true},{"label":"C","body":"Eight times as large","isCorrect":false},{"label":"D","body":"Half as large","isCorrect":false},{"label":"E","body":"Unchanged","isCorrect":false}],"explanation":"F ∝ m1m2, so doubling both masses multiplies the product by 4. The distance term is unchanged."},{"prompt":"Earth exerts a gravitational force on the Moon. Compared to this force, the gravitational force the Moon exerts on Earth is:","options":[{"label":"A","body":"Larger, because the Moon moves around Earth","isCorrect":false},{"label":"B","body":"Smaller, because Earth is more massive","isCorrect":false},{"label":"C","body":"Equal in magnitude and opposite in direction","isCorrect":true},{"label":"D","body":"Zero, because Earth is the \"source\" of gravity","isCorrect":false},{"label":"E","body":"Equal in direction and magnitude","isCorrect":false}],"explanation":"Newton's 3rd law: interaction forces come in equal-and-opposite pairs. Different accelerations happen because a = F/m, not because forces differ."},{"prompt":"Which statement best distinguishes mass and weight?","options":[{"label":"A","body":"Mass depends on location; weight is constant everywhere","isCorrect":false},{"label":"B","body":"Mass is the gravitational force; weight is the amount of matter","isCorrect":false},{"label":"C","body":"Mass is a measure of inertia; weight is the gravitational force on that mass","isCorrect":true},{"label":"D","body":"Mass and weight are the same physical quantity","isCorrect":false},{"label":"E","body":"Weight is measured in kg; mass in newtons","isCorrect":false}],"explanation":"Mass measures how much an object resists acceleration (inertia). Weight is the gravitational force: W = mg. Units also differ: mass in kg, weight in N."},{"prompt":"In a vacuum near Earth's surface, two objects of different masses are dropped from the same height. Which is correct about their accelerations?","options":[{"label":"A","body":"The heavier object accelerates more because gravity pulls harder on it","isCorrect":false},{"label":"B","body":"The lighter object accelerates more because it has less inertia","isCorrect":false},{"label":"C","body":"They accelerate at the same rate because gravitational and inertial mass cancel in a = F/m","isCorrect":true},{"label":"D","body":"Neither accelerates because gravity is balanced by air resistance","isCorrect":false},{"label":"E","body":"Acceleration depends on shape only, not mass","isCorrect":false}],"explanation":"Force from gravity is F = mg and acceleration is a = F/m = g, independent of the object's mass (in vacuum). The \"pull is larger\" but inertia is proportionally larger too."},{"prompt":"The gravitational field strength g at a point is defined as:","options":[{"label":"A","body":"g = m/F","isCorrect":false},{"label":"B","body":"g = F/m (force per unit mass)","isCorrect":true},{"label":"C","body":"g = Fm","isCorrect":false},{"label":"D","body":"g = Gm/r","isCorrect":false},{"label":"E","body":"g = r^2/GM","isCorrect":false}],"explanation":"By definition, gravitational field strength is the gravitational force experienced per unit mass: g = F/m. This makes g a property of the location, not of the test mass."},{"prompt":"Which unit can correctly describe gravitational field strength?","options":[{"label":"A","body":"kg","isCorrect":false},{"label":"B","body":"N","isCorrect":false},{"label":"C","body":"N/kg","isCorrect":true},{"label":"D","body":"J","isCorrect":false},{"label":"E","body":"kg/s","isCorrect":false}],"explanation":"Since g = F/m, its units are N/kg. Near Earth, N/kg is numerically equal to m/s^2, but conceptually it's force per mass."},{"prompt":"Which statement correctly compares G and g?","options":[{"label":"A","body":"G depends on the planet; g is universal","isCorrect":false},{"label":"B","body":"G is universal; g depends on location (mass and radius of the planet)","isCorrect":true},{"label":"C","body":"G and g are the same constant written differently","isCorrect":false},{"label":"D","body":"g is universal; G depends on altitude","isCorrect":false},{"label":"E","body":"Both G and g depend on the test mass","isCorrect":false}],"explanation":"G is the universal gravitational constant (same everywhere). g is the gravitational field strength at a location (e.g., near Earth) and depends on distance from the mass creating the field."},{"prompt":"At a point outside a spherical planet, the direction of the gravitational field vector is:","options":[{"label":"A","body":"Tangential to the surface","isCorrect":false},{"label":"B","body":"Radially outward","isCorrect":false},{"label":"C","body":"Radially inward toward the planet's center","isCorrect":true},{"label":"D","body":"Always upward relative to an observer","isCorrect":false},{"label":"E","body":"Perpendicular to the radius","isCorrect":false}],"explanation":"Gravity is attractive; the field points toward the mass creating it. For a spherically symmetric planet, that means radially inward toward the center."},{"prompt":"If we choose gravitational potential energy U = 0 at infinite separation, then for two masses attracting each other at distance r, U is:","options":[{"label":"A","body":"Always positive","isCorrect":false},{"label":"B","body":"Always negative","isCorrect":true},{"label":"C","body":"Always zero","isCorrect":false},{"label":"D","body":"Positive only for circular orbits","isCorrect":false},{"label":"E","body":"Negative only if the masses are equal","isCorrect":false}],"explanation":"With U(∞)=0, the gravitational potential energy is U = −GMm/r (negative). A bound state has less energy than at infinite separation, so U is negative."},{"prompt":"Which statement correctly links gravitational work and potential energy for a conservative gravitational field?","options":[{"label":"A","body":"W_gravity = +ΔU","isCorrect":false},{"label":"B","body":"W_gravity = −ΔU","isCorrect":true},{"label":"C","body":"W_gravity = ΔK only in space","isCorrect":false},{"label":"D","body":"W_gravity is always zero","isCorrect":false},{"label":"E","body":"W_gravity depends on the path taken","isCorrect":false}],"explanation":"For conservative forces (including gravity), the work done by the force equals the negative change in potential energy: W = −ΔU. Path independence is part of what \"conservative\" means."},{"prompt":"A satellite moves from a lower orbit (closer to Earth) to a higher orbit (farther from Earth). With U(∞)=0, its gravitational potential energy:","options":[{"label":"A","body":"Decreases (becomes more negative)","isCorrect":false},{"label":"B","body":"Increases (becomes less negative)","isCorrect":true},{"label":"C","body":"Stays the same","isCorrect":false},{"label":"D","body":"Becomes zero immediately","isCorrect":false},{"label":"E","body":"Must become positive","isCorrect":false}],"explanation":"U = −GMm/r. Increasing r makes U less negative, so U increases. A common trap is thinking \"going up means more negative,\" but with the infinity-zero convention it's the opposite."},{"prompt":"Which statement best describes gravity (in Newtonian physics) as a force field?","options":[{"label":"A","body":"Gravity is non-conservative; work depends on path","isCorrect":false},{"label":"B","body":"Gravity is conservative; work depends only on initial and final positions","isCorrect":true},{"label":"C","body":"Gravity does no work in any motion","isCorrect":false},{"label":"D","body":"Gravity is conservative only on Earth, not in space","isCorrect":false},{"label":"E","body":"Gravity is conservative only for circular orbits","isCorrect":false}],"explanation":"In Newtonian gravity (ignoring non-gravitational losses), the gravitational force is conservative: the work depends only on endpoints, allowing potential energy to be defined."},{"prompt":"Far from Earth's atmosphere, at a distance from Earth's center of 2R (where R is Earth's radius), the gravitational field strength is approximately:","options":[{"label":"A","body":"2g","isCorrect":false},{"label":"B","body":"g/2","isCorrect":false},{"label":"C","body":"g/4","isCorrect":true},{"label":"D","body":"4g","isCorrect":false},{"label":"E","body":"0","isCorrect":false}],"explanation":"g ∝ 1/r^2. At r = 2R, g becomes g·(R/2R)^2 = g/4. Gravity is weaker but not zero."},{"prompt":"Compared with sea level, a person's weight at the top of a high mountain is (ignoring Earth's rotation effects):","options":[{"label":"A","body":"Slightly smaller","isCorrect":true},{"label":"B","body":"Slightly larger","isCorrect":false},{"label":"C","body":"Exactly the same","isCorrect":false},{"label":"D","body":"Zero","isCorrect":false},{"label":"E","body":"Negative","isCorrect":false}],"explanation":"Weight is W = mg and g decreases with distance from Earth's center (inverse-square). Higher altitude means slightly larger r, so slightly smaller g and smaller weight."},{"prompt":"In an idealized model of Earth as a perfect sphere with uniform density, the gravitational field strength at Earth's exact center is:","options":[{"label":"A","body":"Maximum","isCorrect":false},{"label":"B","body":"Equal to g at the surface","isCorrect":false},{"label":"C","body":"Half of surface g","isCorrect":false},{"label":"D","body":"Zero","isCorrect":true},{"label":"E","body":"Infinite","isCorrect":false}],"explanation":"At the center, gravitational pulls from all directions cancel, giving net field g = 0. (This is distinct from potential, which is not necessarily zero.)"},{"prompt":"In the same uniform-density Earth model, the gravitational field strength at radius r inside Earth (r < R) is proportional to:","options":[{"label":"A","body":"1/r^2","isCorrect":false},{"label":"B","body":"r","isCorrect":true},{"label":"C","body":"r^2","isCorrect":false},{"label":"D","body":"Constant (independent of r)","isCorrect":false},{"label":"E","body":"1/r","isCorrect":false}],"explanation":"Inside a uniform sphere, only the mass enclosed within radius r contributes, and enclosed mass ∝ r^3. Combining with 1/r^2 gives g ∝ r. Thus g increases linearly from 0 at the center to maximum at the surface."},{"prompt":"A classic result: outside a uniform spherical planet, the gravitational field is the same as if all the planet's mass were concentrated at its center. This is essentially due to:","options":[{"label":"A","body":"Friction","isCorrect":false},{"label":"B","body":"The shell theorem for spherical symmetry","isCorrect":true},{"label":"C","body":"Kepler's second law","isCorrect":false},{"label":"D","body":"The conservation of kinetic energy","isCorrect":false},{"label":"E","body":"Air resistance","isCorrect":false}],"explanation":"For spherically symmetric mass distributions, the shell theorem shows that outside the sphere the gravitational effect is equivalent to a point mass at the center. This is why we can use g = GM/r^2 outside planets."},{"prompt":"In the ideal shell theorem model, the gravitational field inside a hollow spherical shell (at any point inside) is:","options":[{"label":"A","body":"Zero everywhere inside","isCorrect":true},{"label":"B","body":"Constant and nonzero","isCorrect":false},{"label":"C","body":"Maximum at the center","isCorrect":false},{"label":"D","body":"Pointing outward","isCorrect":false},{"label":"E","body":"Equal to GM/R^2 inside","isCorrect":false}],"explanation":"For a uniform spherical shell, gravitational pulls from different parts of the shell cancel at any interior point, giving zero net gravitational field inside the shell."}]}"
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