MHT-CET Laws of Motion — practice questions
74 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice MHT-CET Laws of Motion in the app →Contact forces like friction ultimately arise from:The laws of friction are best described as:Friction between two surfaces in contact opposes:A box stays at rest on the floor of an accelerating train. What accelerates it?Crate on a truck bed, μs = 0.25, g = 10 m/s². Highest truck acceleration with no slipping?In the spring law F = -kx, the minus sign means:Forces of 3 N and 4 N act at right angles on a particle. What third force keeps it in equilibrium?A 4 kg mass on a rope is held aside by a 30 N horizontal pull (g = 10 m/s²). Upper rope tension?Which of these forces acting on a body is a contact force?For equal weight, how does rolling friction compare with sliding?Why are ball bearings placed between moving parts of a machine?How does the coefficient of kinetic friction compare with that of static friction for the same surfaces?A car takes a turn on a flat horizontal road. Which force supplies the centripetal force?A stone is whirled in a circle on a string. What provides its centripetal force?A car rounds a flat curve of radius 80 m with µs = 0.5 and g = 10 m/s². Maximum safe speed?Which expression gives the SI unit of force, the newton, in base units?Second law is a local law. What does this say about acceleration?Impulse is the product of force and time. What else is it equal to?What may be assumed about position during a brief impulsive force?Which statement on action and reaction forces is correct?A body is in complete equilibrium. Besides zero net force, what else holds?What does Newton's second law reduce to when the net force on a body is zero?On a perfectly smooth train floor, what happens to a box as the train speeds up?Newton's second law is a vector equation. What does this imply for force and acceleration?Which Greek thinker held that a force is needed to keep a body moving?Why does a toy car pulled by a child stop when the string is released?Which scientist's inclined plane experiments led to the law of inertia?A body moving on a frictionless horizontal plane has what acceleration?A spaceship with rockets off in deep space, far from all objects, will do what?Newton's first law is a statement about which property of matter?Momentum is defined as the product of which two quantities?What is the SI unit of momentum?A 2 kg trolley moves at 5 m/s. What is its momentum?The second law relates the net external force to which quantity?A 4 kg block is pushed by a net force of 20 N. Its acceleration is?What net force gives a 5 kg body an acceleration of 3 m/s²?The same force acts for the same time on a light and a heavy body at rest. What is equal afterwards?Why does a cricketer pull his hands back during a catch?A force of 50 N acts on a ball for 0.2 s. What impulse does it give?A 10 N force acts on a 5 kg body at rest for 3 s. Final speed?A 0.15 kg ball hits a bat at 10 m/s and returns at 10 m/s. Impulse magnitude?A 2 kg body's speed changes from 3 m/s to 8 m/s along a line. Impulse?Newton's third law says forces between two bodies are?Action and reaction forces act on which bodies?A stone falls to Earth. What does the stone do to the Earth?Internal forces within a system of particles do what to the net force?State the law of conservation of momentum for an isolated system.A 0.02 kg bullet leaves a 3 kg gun at 300 m/s. Gun recoil speed?A 2 kg body at 6 m/s hits a 4 kg body at rest and they stick. Speed after?In a particle in equilibrium under three forces, their vector sum is?A 6 kg mass hangs at rest from a string. Tension in the string? (g = 10 m/s²)The restoring force in a stretched string is called?A spring of constant 200 N/m is stretched 0.05 m. Restoring force?The component of contact force parallel to the surfaces is called?Of the four fundamental forces, which two matter in mechanics?At the microscopic level, contact forces ultimately arise from which force?A solid in a fluid feels an upward buoyant force equal to what?Static friction acts to oppose what?The limiting value of static friction depends on which factor?A 10 kg block rests on a floor with µs = 0.5. Maximum static friction? (g = 10 m/s²)A 5 kg block slides with µk = 0.2. Kinetic friction? (g = 10 m/s²)Friction opposes which kind of motion between surfaces?A box stays at rest on a train floor with µs = 0.2. Maximum train acceleration? (g = 10)Once a body slides, kinetic friction is generally what compared with the static maximum?The force toward the centre in circular motion is called?A 0.5 kg stone whirls at 4 m/s in a circle of radius 2 m. Centripetal force?What supplies centripetal force for a car turning on a level road?A car on a level road has µs = 0.5 and turn radius 20 m. Maximum speed? (g = 10)The maximum safe speed of a car on a level curve is independent of?A lift carrying a 60 kg person accelerates up at 2 m/s². Normal force? (g = 10)The same lift accelerates down at 2 m/s². Normal force on the 60 kg person? (g = 10)A block slides down a smooth 30 degree incline. Its acceleration? (g = 10 m/s²)Two blocks of 2 kg and 3 kg touch on a smooth desk. A 10 N push gives acceleration?A book rests on a desk. Why are weight and normal force not an action-reaction pair?