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
ChapterAllAlgebraic Expressions and IdentitiesCell Structure and FunctionsChemical Effects of Electric CurrentCoal and PetroleumCombustion and FlameComparing QuantitiesConservation of Plants and AnimalsCrop Production and ManagementExponents and PowersForce and PressureFrictionLightLinear Equations in One VariableMaterials: Metals and Non-MetalsMensurationMicroorganisms: Friend and FoePollution of Air and WaterReaching the Age of AdolescenceReproduction in AnimalsSome Natural PhenomenaSoundSquares and Square RootsSynthetic Fibres and Plastics

Showing 1 question for Class 8. Tap a card to reveal the answer.

PhysicsForce and Pressureeasy

A sharp knife cuts better than a blunt one. Explain using the idea of pressure.

Reveal answer ↓

What it is

Pressure is how concentrated a force is - the same push on a smaller area presses much harder.

Answer

Pressure is the force acting on a unit area, P = F/A. A sharp knife has a very small area at its edge, so for the same force the pressure it exerts is much greater, and it cuts easily. A blunt knife has a larger edge area, so the same force produces less pressure and cuts poorly.

P = F / A

  • •Pressure = force / area (P = F/A)
  • •Smaller area -> greater pressure
  • •Sharp edge = small area = high pressure

Why learn this

It explains sharp knives, nails, a camel's wide feet on sand, and why a thin bag strap hurts your shoulder.

💡 Memory trick

Same force, Smaller area = Stronger press - the three S's.