Here are the step-by-step solutions for each question on the worksheet:
1. Every force has \_\_\_\_\_\_\_\_\_\_.
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Reasoning: In physics, a force is defined as a push or a pull. To fully describe a force, you need to know two things: how strong it is (strength/magnitude) and which way it is going (direction).
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Selection: Option B includes both of these necessary parts.
2. A constraint is \_\_\_\_\_\_\_\_\_\_.
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Reasoning: In engineering and design, a constraint is a rule or a limitation that you have to follow. It is something that stops you from doing whatever you want, such as a budget limit or a size limit.
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Selection: Option B ("a limit to the design") fits this definition perfectly.
3. When forces are balanced, the net force is \_\_\_\_\_\_\_\_\_\_.
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Reasoning: Balanced forces are equal in size but opposite in direction. Because they are equal and opposite, they cancel each other out completely. When you add them together, the total (net) force is zero.
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Selection: Option A ("zero").
4. When \_\_\_\_\_\_\_\_\_\_ forces act on an object, they make the object move.
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Reasoning: If forces are balanced, the object stays still or keeps moving at the same speed. To make an object start moving, speed up, or turn, you need a net force that is *not* zero. These are called unbalanced forces.
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Selection: Option A ("unbalanced").
5. The poles of a magnet are \_\_\_\_\_\_\_\_\_\_.
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Reasoning: Every magnet has two ends where the magnetic force is strongest. These ends are named based on the direction they point (North and South).
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Selection: Option B ("north and south").
6. Opposite poles of magnets \_\_\_\_\_\_\_\_\_\_ each other.
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Reasoning: Magnets have a special rule: "Opposites attract." A North pole will pull towards a South pole.
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Selection: Option A ("attract").
7. An electromagnet uses electricity to produce a \_\_\_\_\_\_\_\_\_\_ force.
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Reasoning: An electromagnet is a type of magnet that is created by running an electric current through a wire. This electricity creates a magnetic field, resulting in a magnetic force.
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Selection: Option A ("magnetic").
Final Answer:
1. B
2. B
3. A
4. A
5. B
6. A
7. A
Parent Tip: Review the logic above to help your child master the concept of free physical science worksheet.
