1. **Indicate type of force for each action:** - Screwing in a light bulb: **Turn or Twist** (forces involved twist motion) - Opening a refrigerator: **Pull** (pulling door open) - Plaiting hair: **Pull and Twist** (twist hair strands and pull) - Typing on a keyboard: **Push** (pressing keys down) - Skipping with a rope: **Pull and Push** (rope is pulled and pushed in turns) - Scooping porridge: **Push and Pull** (spoon pushes into porridge and pulls up) - Peeling a banana: **Pull and Twist** (twist peel and pull) - Moving a wheelbarrow: **Push and Pull** (handle pushed or pulled to move) 2. **At each point (A-D) on ball diagram:** - Point A: Force applied, motion starts, forces unbalanced, overcoming friction and gravity - Point B: Forces balanced (equal contact force and gravity), ball rolling at constant speed - Point C: Forces unbalanced due to friction slowing ball, motion slows - Point D: Ball at rest, net force zero (balanced forces) 3. **Match statements to picture numbers:** - Changes shape temporarily: Picture 3 - Changes shape permanently: Picture 2 - Starts motion of object: Picture 1 - Stops motion of object: Picture 5 - Changes direction of movement: Picture 4 4. **Least force used when kicking balls:** - Styrofoam (lowest mass 5g, so less force to travel same distance) 5. **Reason:** - (b) The greater the mass, the more force is needed. 6. **Styrofoam ball in water likely behaves as picture B (floating near top)** - Reason: Styrofoam has low density, less than water, so it floats. 7. **Two forces acting on ball in container C:** - (a) Gravity and (d) Upthrust (buoyancy) forces 8. **Ball in container C totally immersed because:** - (a) Its weight force and buoyancy (upthrust) force are equal 9. **Which boy is doing work?** - (b) Boy in Picture B - Reason: Doing work requires force causing displacement; sweeping leaves involves moving objects, studying does not. 10. **Safety advice for new driver on wet, smooth roads:** - Drive slower than usual - Maintain greater distance from other vehicles - Avoid sudden movements (steering, acceleration, braking) - Use treaded tyres to prevent slipping - Stay alert and cautious 11. **Treaded tyres help because:** - (c) They push backwards against the road (creating forward reaction force) 12. **Surfaces inferred to differ in friction:** - Longer arrow surface has less friction (rolls farther) - Shorter arrow surface has more friction (stops sooner) - Reason: More friction means more energy lost, reducing distance rolled 13. **Main forces illustrated:** - I = Air resistance - II = Friction - III = Floating 14. **Explanation of pictures:** - A: Ant applies force uphill showing work against gravity and friction - B: Boulder at rest showing balanced forces with gravity and normal contact force equal