Year 5 / Primary Science / Physics foundations / Forces
Gravity, friction and resistance: structured theory, worked examples, answered practice, and a mastery checklist for Year 5.
单元
练习前按清晰顺序掌握本章核心概念。
Choose the body or system, define a positive direction, and mark every force or motion quantity before writing an equation.
A free-body or motion diagram comes before the law. Use resultant force to connect interaction and acceleration.
Vector quantities depend on direction. Keep signs consistent and check that the final unit matches the requested quantity.
For “weight”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.
For “air resistance”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.
For “water resistance”, start from an observation or model, define quantities and units where relevant, and separate the changed factor from the measured outcome. Support the conclusion with data and state the test's limitations.
Primary Science / Physics foundations
逐步查看方法，并理解每一步为何成立。
In a safe test about “weight”, the first condition gives 14 units and the second 11. Which is greater, and what should be kept the same?
The first value is greater by 3 units. A fair test changes only one factor.
Explain “weight” in your own words and use a picture, objects, a table, or a simple measurement to support it.
A complete explanation connects the correct idea, a clear representation, and a sensible check.
Gravity, friction and resistance
八道分层练习，从基础熟练到考试应用。请先独立完成，再查看提示或答案。
Record 9 safe observations about “weight” without writing a conclusion yet.
An observation is something seen, heard, or measured.
The response needs 9 specific observable or measurable statements, not guesses about cause.
Design a fair test for “air resistance”: what changes, what is measured, and which 5 things stay the same?
Change one factor only.
Full response: one changed factor, one measurable outcome, and 5 controlled conditions.
Measurements are 8, 2, and 10 units. Put them in a table, find the greatest, and the difference from the least.
Use condition and measurement headings.
Greatest 10, least 2, difference 8 units.
Sort examples of “weight” into two groups and state the sorting rule.
Each item should clearly match one group.
A full response gives two named groups, at least two examples in each, and an observable sorting rule.
Choose a suitable tool and unit to measure something connected with “air resistance”.
Decide whether you measure length, time, mass, temperature, or volume.
The quantity, instrument, and unit must match, e.g. time-stopwatch-s or length-ruler-cm.
From data 3, 6, 9, predict the next value and explain the pattern.
Look for the constant change +3.
12; +3.
Write 5 safety rules for a simple activity about “weight” and explain the risk each reduces.
Link each rule to a reason.
A full response gives 5 specific rules, each linked to a risk, and requires supervision where appropriate.
Data A=9 and B=11. Write a conclusion, evidence, and one limitation about “air resistance”.
Do not claim more than the two values show.
B is 2 greater than A. The values support this, but two measurements alone do not prove a general rule.
Gravity, friction and resistance
六道不同作业，从基础到挑战，包含预计用时、提示和答案指南。
Homework 1: Record 5 safe observations about “weight” without writing a conclusion yet.
An observation is something seen, heard, or measured.
The response needs 5 specific observable or measurable statements, not guesses about cause.
Homework 2: Design a fair test for “air resistance”: what changes, what is measured, and which 6 things stay the same?
Change one factor only.
Full response: one changed factor, one measurable outcome, and 6 controlled conditions.
Homework 3: Measurements are 4, 3, and 7 units. Put them in a table, find the greatest, and the difference from the least.
Use condition and measurement headings.
Greatest 7, least 3, difference 4 units.
Homework 4: Sort examples of “weight” into two groups and state the sorting rule.
Each item should clearly match one group.
A full response gives two named groups, at least two examples in each, and an observable sorting rule.
Homework 5: Choose a suitable tool and unit to measure something connected with “air resistance”.
Decide whether you measure length, time, mass, temperature, or volume.
The quantity, instrument, and unit must match, e.g. time-stopwatch-s or length-ruler-cm.
Homework 6: From data 6, 10, 14, predict the next value and explain the pattern.
Look for the constant change +4.
18; +4.
35 分钟 / 30 分
带计时器、完整分值和参考答案的章节自测。
Start the timer when ready, work without notes, show every step, and open model answers only after finishing.
1. Record 3 safe observations about “weight” without writing a conclusion yet.
2 分The response needs 3 specific observable or measurable statements, not guesses about cause.
2. Design a fair test for “air resistance”: what changes, what is measured, and which 6 things stay the same?
3 分Full response: one changed factor, one measurable outcome, and 6 controlled conditions.
3. Measurements are 9, 3, and 12 units. Put them in a table, find the greatest, and the difference from the least.
3 分Greatest 12, least 3, difference 9 units.
4. Sort examples of “weight” into two groups and state the sorting rule.
4 分A full response gives two named groups, at least two examples in each, and an observable sorting rule.
5. Choose a suitable tool and unit to measure something connected with “air resistance”.
4 分The quantity, instrument, and unit must match, e.g. time-stopwatch-s or length-ruler-cm.
6. From data 4, 8, 12, predict the next value and explain the pattern.
4 分16; +4.
7. Write 6 safety rules for a simple activity about “weight” and explain the risk each reduces.
5 分A full response gives 6 specific rules, each linked to a risk, and requires supervision where appropriate.
8. Data A=3 and B=6. Write a conclusion, evidence, and one limitation about “air resistance”.
5 分B is 3 greater than A. The values support this, but two measurements alone do not prove a general rule.
单元
课程参考来源；教学顺序请始终与学校和老师确认。
Primary Science / Physics foundations
Year 5: 数学与物理的结构化路线，包含章节、练习和下一步。
结构跟随教材，用来帮助组织学习。
通常容易出错或需要更多复习的部分。
从教材、daily material、PDFs、videos 和 worked examples 开始。
进入 full tests 前先做 targeted practice，让覆盖情况更清楚。
如何衡量本章进度，以及何时加入综合 mock。
完成本章后该做什么，以及它如何连接到下一单元。
说明：每学年的正式考试范围请始终以学校、老师和当前官方来源为准。
