Types Of Force
Contact and non-contact forces; friction and gravity.
Types Of Force
Types of Force
What you'll learn
- What force is — a push or a pull that can start, stop, or change motion.
- To classify forces as contact (need touching) and non-contact (act at a distance).
- To recognise friction, gravity, magnetic force, and ** muscular force** in daily life.
- To connect ideas with NCERT Looking Around 5, Chapter 9 (Up You Go!) — climbing, pulling, and pushing.
Key concepts
Level 1 — Contact vs non-contact
Verbal: A force can change speed, direction, or shape of an object.
Symbolic: Force → change in motion or deformation.
| Type | Needs touch? | Examples |
|---|---|---|
| Contact | Yes | Push door, kick ball, friction on shoes |
| Non-contact | No | Gravity (falling apple), magnet pulling iron |
| Muscular | Yes (body) | Lifting bag, climbing rope (Ch 9) |
NCERT link (Looking Around 5, Ch 9): Mountaineers use muscular force to climb; ropes experience tension (pull).
Level 2 — Common forces in everyday life
Verbal: Friction opposes sliding — helps us walk without slipping; gravity pulls objects toward Earth.
Real-life: Brakes on a bicycle use friction to slow down; a cricket ball falls because of gravity.
| Force | Effect | EVS / daily example |
|---|---|---|
| Friction | Opposes motion | Writing with pencil on paper |
| Gravity | Pulls downward | Water flows downhill in a stream |
| Magnetic | Attracts/repels iron | Fridge magnet holds note |
| Elastic | Stretches and returns | Rubber band on a bundle |
Worked example
Why does a book stay on a table until you push it?
Step 1 — Gravity pulls book down; table pushes up (contact force).
Step 2 — Forces balance → book at rest.
Step 3 — When you push sideways, friction opposes until push > friction → book slides.
Answer: Balanced forces at rest; unbalanced push overcomes friction.
Is magnetic force contact or non-contact?
Step 1 — Magnet attracts nail without touching it.
Step 2 — Acts through air → non-contact force.
Answer: Non-contact force.
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| "No motion = no force" | Ignoring balanced forces | Objects at rest can have equal opposing forces |
| Friction always bad | Only seeing wear and heat | Friction enables walking, gripping, braking |
| Gravity only on falling things | Missing weight at rest | Gravity acts on all masses near Earth |
| Magnet attracts all metals | Everyday confusion | Most magnets attract iron, nickel, cobalt — not all metals |
Quick check
- Give one contact and one non-contact force example.
- Why do mountaineers use rough-soled boots? (Link to Ch 9.)
- Name the force that pulls a dropped ball downward.
- Stretch: Two teams tug a rope. Name two forces acting on the rope.
Revision tip: Walk around your home and label five "push/pull" moments — door, drawer, tap, lift bag, magnet on fridge — as contact or non-contact.
Open the Practice tab for graded questions on Types of Force.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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