Science Class 8
Exploring Forces
Pushes and pulls, friction, weight, mass and upthrust.
15 lessons · ~83 min total
Track progress — 0 of 15 lessons read 0%
Lessons in this topic
- 0 Start here A roadmap: pushes, pulls, friction, weight, mass and upthrust. · 3 min You are here
- 1 A push or a pull A force is a push or a pull. It comes from two objects interacting. · 6 min
- 2 What a force does A force can start motion, change speed, change direction or change shape. · 6 min
- 3 Touching, or not Contact forces need touching. Non-contact forces act across a gap. · 6 min
- 4 Two at once On one line, same-way forces add and opposite forces subtract. The leftover is the net force. · 6 min
- 5 When the forces balance Forces are balanced when they cancel. The motion does not change. · 6 min
- 6 When they do not balance Unbalanced forces change motion. The leftover speeds up, slows down or turns an object. · 6 min
- 7 The surface pushes back Friction acts against motion between two surfaces. Rougher surfaces give more. · 6 min
- 8 Friction both ways Friction helps us grip and stop. It hurts where it wastes effort or wears parts. · 6 min
- 9 Weight and the spring balance Weight is the pull of the Earth. A spring balance reads it in newtons. · 6 min
- 10 Mass stays, weight changes Mass is the amount of matter. Weight is a pull, so it changes with the place. · 6 min
- 11 The push a liquid gives A liquid pushes up on an object. Weight and this upthrust decide sink or float. · 6 min
- 12 Checkpoint: weight, mass and upthrust A graded check on reading a balance, mass and weight, and upthrust. · 5 min
- 13 The big picture Eleven ideas about pushes, pulls, friction, weight and upthrust, on one screen. · 3 min
- 14 Track quiz The eleven rules the labs use, then one question on each idea. · 6 min
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