Educational worksheet on friction and air resistance for Year 3 Science, including a hot air balloon illustration with key terms.

Let's solve the worksheet titled "Friction and air resistance" step by step. The task is to fill in the blanks using the words from the hot air balloon:

Words available (from the hot air balloon):

- slow
- heat
- reduce
- sliding
- skating
- surfaces
- tyres
- streamlined
- air
- parachute
- friction

---

Now, let’s go through each sentence and choose the correct word(s) based on context.

---

1. Friction gives us grip between two _________.

✔ surfaces
→ Friction occurs between two surfaces in contact.
✔️ Correct: *surfaces*

---

2. Friction produces _________.

✔ heat
→ When two surfaces rub together, they produce heat due to friction.
✔️ Correct: *heat*

---

3. Friction is very useful on our shoes. It stops us _________ across the floor.

✔ sliding
→ Without friction, we would slide easily. Friction prevents that.
✔️ Correct: *sliding*

---

4. It's a useful grip for car _________.

✔ tyres
→ Car tyres need friction to grip the road.
✔️ Correct: *tyres*

---

5. When skiing or ice _________, we would like to _________ the amount of friction to make it easier to slide.

First blank: ✔ skating
→ "Skiing or ice skating" – both are winter sports involving sliding on ice.

Second blank: ✔ reduce
→ We want to reduce friction so we can glide more easily.

✔️ Correct: *skating*, *reduce*

---

6. If roads are icy, cars can slip and slide because there is less _________ on ice than on tarmac.

✔ friction
→ Ice has less friction, which causes slipping.
✔️ Correct: *friction*

---

7. Air _________ is the friction between the _________ and objects moving through it.

First blank: ✔ resistance
→ "Air resistance" is the force opposing motion through air.

Second blank: ✔ air
→ Air resistance is between air and moving objects.

✔️ Correct: *resistance*, *air*

---

8. A car is _________ in shape to allow air to pass over it more freely, whereas a _________ needs a large area of air resistance to _________ it down.

First blank: ✔ streamlined
→ Cars are streamlined to reduce air resistance.

Second blank: ✔ parachute
→ A parachute uses air resistance to slow descent.

Third blank: ✔ slow
→ It needs air resistance to slow it down.

✔️ Correct: *streamlined*, *parachute*, *slow*

---

Final Answer Key:

Fill in the gaps:

1. Friction gives us grip between two surfaces.
2. Friction produces heat.
3. Friction is very useful on our shoes. It stops us sliding across the floor.
4. It's a useful grip for car tyres.
5. When skiing or ice skating, we would like to reduce the amount of friction to make it easier to slide.
6. If roads are icy, cars can slip and slide because there is less friction on ice than on tarmac.
7. Air resistance is the friction between the air and objects moving through it.
8. A car is streamlined in shape to allow air to pass over it more freely, whereas a parachute needs a large area of air resistance to slow it down.

---

✔ All words used:
- surfaces
- heat
- sliding
- tyres
- skating
- reduce
- friction
- resistance
- air
- streamlined
- parachute
- slow

All 12 words from the balloon are used correctly!

Let me know if you'd like this as a printable answer sheet!