Here’s the completed worksheet with the correct force-related words filled in, along with explanations for each answer:
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1. The greater the _force_ the easier the object will move.
✔ Explanation: Force is a push or pull that can cause an object to accelerate. Greater force applied to an object makes it easier to overcome inertia and start moving.
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2. To do the job in less time and with less energy, use a _machine_.
✔ Explanation: Simple machines (like levers, pulleys, or ramps) help reduce the effort needed to do work by multiplying force or changing its direction — making tasks easier and faster.
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3. That rock will roll down the hill due to the force of _gravity_.
✔ Explanation: Gravity is the force that pulls objects toward the center of the Earth. It causes the rock to accelerate downhill.
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4. To make something _balance_ both ends need to have the same weight.
✔ Explanation: Balance occurs when forces or weights on either side are equal. For example, a seesaw balances when both sides have equal mass (or torque).
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5. It takes _energy_ to get a job done.
✔ Explanation: Energy is the capacity to do work. Any physical task requires energy — whether from muscles, engines, or other sources.
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6. _Inertia_ is the idea that something in motion will remain in motion, and something at rest will remain at rest, unless affected by an outside source.
✔ Explanation: This is Newton’s First Law of Motion — often called the Law of Inertia. Inertia describes an object’s resistance to changes in its state of motion.
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7. It would be more difficult to _push_ a wagon if it didn’t have wheels.
✔ Explanation: Without wheels, friction between the wagon and the ground increases dramatically, making it much harder to push.
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8. If you have a few people _pulling_ on the rope, the box will be easier to move.
✔ Explanation: Pulling applies force in the direction needed to move the box. More people pulling = greater total force = easier movement.
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9. _Newton_’s theories on motion are still believed correct today.
✔ Explanation: Sir Isaac Newton formulated the three laws of motion and the law of universal gravitation — foundational principles in classical physics that still hold true for everyday situations.
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10. We added wheels to our bureau to create less _friction_ when we move it.
✔ Explanation: Wheels reduce friction by converting sliding friction into rolling friction, which is much weaker. This makes moving heavy furniture easier.
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✔ Final Answer Key:
1. force
2. machine
3. gravity
4. balance
5. energy
6. inertia
7. push
8. pulling
9. Newton
10. friction
Let me know if you’d like a printable version or a visual diagram to go with this!
Parent Tip: Review the logic above to help your child master the concept of force and motion worksheet 8th grade.
