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Science
Class 8

CBSE · Class 8 · Science

Exploring Forces

Chapter 5CuriosityNCERT · Classes I–VIII · current textbook editions

8 worlds · 5 labs for this chapter.

Topics

Forces
- Pushes and pulls
- Effects on motion and shape
- Combining forces
- Contact and non-contact forces
- Friction
Gravity and fluids
- Weight and its measurement
- Distinguishing mass and weight
- Buoyancy and floating

Learning objectives

Identify forces acting on an object and explain an observed change in motion or shape.

Worlds

Places to explore freely · 8 worlds

WorldPressure & BuoyancyFloat steel, ice and a drum in three waters, then dive a research sub down a 100 m wall and stop it halfway
WorldFree Fall & Air ResistanceRace a hammer and a feather through a vacuum, then ride a 45 m drop tower until the air stops you speeding up
WorldFrictionWax a playground slide, mat it, rain on it, then tilt a test chute until a rubber boot finally lets go
WorldMotion & ForcesEight experiments on one track, Class 6–9 or Class 10–12 — light gates, ticker tape, friction, a ramp, a crash — each stop measured by the cart itself
WorldOrbits & GravitationFire Newton's cannon from a mountain above the air until the ball falls all the way round a real-scale Earth
WorldPressure in LiquidsA tank you fill and drain — pressure with depth, jets from holes, what floats and what sinks, a hydraulic lift and a U-tube
WorldNewton’s Laws of MotionBrake a 1,720 t freight train from 100 km/h and watch it need nearly a kilometre: Newton’s laws in a rail yard
WorldStopping DistanceTwice as fast needs four times the road, and rain makes it worse: brake a test car on a 120 m road

Main labs

Built for this chapter · 3 labs

Main labForce and Motion LabEVS
Main labForce & PressurePhysics
Main labFriction LabPhysics

More labs

Also fit this chapter · 2 labs

LabGravitationPhysics
LabForce and Laws of MotionForce, mass, acceleration

Practice

Questions for Class 8 Science, with worked answers, on screen or as a printed paper.

Open the question bank

Previous chapterElectricity: Magnetic and Heating Effects Next chapterPressure, Winds, Storms, and Cyclones