Here is the completed worksheet with the correct force words filled in, along with an explanation for each answer.
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Forces & Motion
Directions: Write the force words that complete each sentence.
Word Bank:
push, pull, gravity, friction, force, inertia, machine, energy, balance, Newton
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1. The greater the _force_ the easier the object will move.
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Explanation: Force is a push or pull that can cause an object to accelerate (change its motion). A greater force applied to an object will overcome its resistance to motion more easily, making it move faster or start moving from rest.
2. To do the job in less time and with less energy, use a _machine_.
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Explanation: Simple machines (like levers, pulleys, ramps) are designed to make work easier by changing the amount of force needed, the distance over which it's applied, or the direction of the force. They allow you to accomplish a task using less effort (energy) or more quickly.
3. That rock will roll down the hill due to the force of _gravity_.
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Explanation: Gravity is the attractive force between masses. On Earth, it pulls objects towards the center of the planet. The rock rolls downhill because gravity pulls it downward.
4. To make something _balance_ both ends need to have the same weight.
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Explanation: Balance refers to a state where opposing forces or weights are equal, resulting in stability. For an object like a seesaw to be balanced horizontally, the weights on both sides must be equal (or their torques must cancel out).
5. It takes _energy_ to get a job done.
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Explanation: Energy is the capacity to do work. Any physical task, whether lifting, pushing, pulling, or moving an object, requires energy to be transferred or transformed.
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.
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Explanation: This is Newton's First Law of Motion, also known as the law of inertia. Inertia is the tendency of an object to resist changes in its state of motion. An object at rest stays at rest, and an object in motion stays in motion with the same speed and direction unless acted upon by an unbalanced force.
7. It would be more difficult to _push_ a wagon if it didn't have wheels.
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Explanation: Without wheels, the bottom of the wagon would slide directly on the ground, creating significant friction. Pushing (applying a forward force) against this high friction would require much more effort than pushing a wheeled wagon, where rolling friction is much lower.
8. If you have a few people _pulling_ on the rope, the box will be easier to move.
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Explanation: Pulling is applying a force to draw something closer. When multiple people pull together on a rope attached to a box, they combine their forces, making it easier to overcome the box's inertia and friction to move it.
9. _Newton_'s theories on motion are still believed correct today.
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Explanation: Sir Isaac Newton formulated the three fundamental laws of motion in the 17th century. These laws form the foundation of classical mechanics and accurately describe the motion of everyday objects under most conditions, even today.
10. We added wheels to our bureau to create less _friction_ when we move it.
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Explanation: Friction is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. Adding wheels changes sliding friction (which is high) into rolling friction (which is much lower), making it significantly easier to move the heavy bureau.
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✔ All blanks are now correctly filled using words from the provided word bank.
Parent Tip: Review the logic above to help your child master the concept of forces and motion worksheet.
