Worksheet science friction 2 | Febtry Yndary Ayu Kusuma - Free Printable

Here's the complete solution to the “Friction 2” worksheet, with clear explanations for each part.

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## Part A: Look at the pictures. Write what frictions which happen around us. Use the words in the box.

We are matching objects that experience friction with the surfaces or mediums they interact with.

Words available:
shoe, grass, car, ice skate, airplane, boat,
road, ice, water, ball, pavement, air

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Picture 1: Car and road surface

- The car’s tires rub against the road.
✔ Answer: `car` and `road`

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Picture 2: Shoe and pavement (sidewalk)

- The shoe is walking on a paved surface — this is pavement.
✔ Answer: `shoe` and `pavement`

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Picture 3: Ball rolling on grass

- The soccer ball is moving across grass.
✔ Answer: `ball` and `grass`

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Picture 4: Ice skate on ice

- Ice skates glide on ice — there’s still some friction (though very little).
✔ Answer: `Ice skate` and `ice`

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Picture 5: Airplane flying through air

- The plane moves through the air, experiencing air resistance (a type of friction).
✔ Answer: `airplane` and `Air`

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Picture 6: Boat floating on water

- The boat moves through water, which creates fluid friction.
✔ Answer: `Boat` and `water`

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## ✔ Final Answers for Part A:

| Picture | Answer |
|---------|--------------------|
| 1 | car and road |
| 2 | shoe and pavement |
| 3 | ball and grass |
| 4 | Ice skate and ice |
| 5 | airplane and Air |
| 6 | Boat and water |

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## Part B: Write whether friction is ‘useful’ or ‘not useful’ in the activities below.

Friction is useful when it helps us control motion, stop, grip, or move forward.
Friction is not useful when it slows us down unnecessarily, causes wear, or wastes energy.

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Let’s analyze each activity:

1. brake the car → Friction between brake pads and wheels stops the car → Useful
2. ride a bike → Friction between tires and road lets you move forward without slipping → Useful
3. stop sliding → Friction helps you stop sliding (e.g., on a slide or icy surface) → Useful
4. fly the plane → Air friction (drag) makes the plane work harder and uses more fuel → Not useful *(Note: Some friction is needed for control, but generally drag is seen as inefficient)*
5. play a slide → You want to slide easily — friction slows you down → Not useful
6. turn a car to the left → Friction between tires and road allows turning → Useful
7. kick a ball → Friction helps the foot grip the ball briefly to kick it → Useful
8. stop a trolley → Friction in brakes or wheels helps stop it → Useful

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## ✔ Final Answers for Part B:

| Activity | Useful / Not Useful |
|-----------------------|---------------------|
| brake the car | useful |
| ride a bike | useful |
| stop sliding | useful |
| fly the plane | not useful |
| play a slide | not useful |
| turn a car to the left| useful |
| kick a ball | useful |
| stop a trolley | useful |

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## 🎯 Summary:

This worksheet teaches students how friction works in everyday life — both helping us (like stopping cars or walking) and sometimes hindering us (like slowing planes or slides).

Let me know if you’d like a printable version or visual aids!