AimMent

For Class 8, 9 & 10

Foundation - a strong base in Physics, Chemistry, Maths & Biology

Concept-first questions with clear model answers across all four subjects, aligned to NCERT. Start early, build the habit, and walk into your board exams, NEET and JEE already ahead.

Class 824Class 924Class 1036
SubjectAllPhysics 19Chemistry 19Biology 19Mathematics 27
ChapterAllAtoms and MoleculesForce and Laws of MotionGravitationHeron's FormulaImprovement in Food ResourcesIs Matter Around Us PureLinear Equations in Two VariablesMatter in Our SurroundingsMotionNatural ResourcesNumber SystemsPolynomialsSoundStatisticsStructure of the AtomSurface Areas and VolumesThe Fundamental Unit of LifeTissuesWork and Energy

Showing 1 question for Class 9. Tap a card to reveal the answer.

PhysicsForce and Laws of Motionmedium

State Newton's second law of motion and define momentum.

Reveal answer ↓

What it is

Force is what changes an object's momentum; for a fixed mass, force = mass x acceleration.

Answer

Newton's second law states that the rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction of the force; for constant mass this gives F = ma. Momentum is the quantity of motion of a body, equal to the product of its mass and velocity, p = mv.

F = ma ; p = mv

  • •Rate of change of momentum is proportional to force
  • •F = ma (for constant mass)
  • •Momentum p = mv
  • •Change is in the direction of the force

Why learn this

It's why seatbelts and airbags save lives, and how rockets and cricket shots are designed.

💡 Memory trick

F = ma ('Force = Mass Accelerates'); momentum p = mv is 'mass in motion'.