Forces & Motion worksheet with vocabulary and sentence completion exercises.

Let's solve the worksheet step by step, filling in the blanks with the appropriate force-related terms from the provided list.

Worksheet: Forces & Motion

#### Directions: Write the force words that complete each sentence.
- push
- pull
- gravity
- friction
- force
- inertia
- machine
- energy
- balance
- Newton

---

1. The greater the ________, the easier the object will move.

- Answer: force
- Explanation: The greater the force applied to an object, the easier it is to move the object. This is based on Newton's Second Law of Motion, which states that force equals mass times acceleration (\( F = ma \)).

---

2. To do the job in less time and with less energy, use a ________.

- Answer: machine
- Explanation: Machines help reduce the effort required to perform tasks by changing the direction or magnitude of the force applied. Examples include levers, pulleys, and inclined planes.

---

3. That rock will roll down the hill due to the force of ________.

- Answer: gravity
- Explanation: Gravity is the force that pulls objects toward the center of the Earth. When a rock is on a hill, gravity causes it to roll downhill.

---

4. To make something ________ both ends need to have the same weight.

- Answer: balance
- Explanation: Balance occurs when the forces acting on an object are equal and opposite, resulting in no net force. For example, a seesaw is balanced when the weights on both ends are equal.

---

5. It takes ________ to get a job done.

- Answer: energy
- Explanation: Energy is the ability to do work. Without energy, no task can be completed. Different forms of energy (e.g., kinetic, potential) are used to accomplish work.

---

6. ________ 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.

- Answer: inertia
- Explanation: Inertia is the tendency of an object to resist changes in its state of motion. This principle is described by Newton's First Law of Motion, also known as the Law of Inertia.

---

7. It would be more difficult to ________ a wagon if it didn’t have wheels.

- Answer: push
- Explanation: Wheels reduce friction, making it easier to move objects like wagons. Without wheels, pushing the wagon would require more effort due to increased friction between the ground and the wagon.

---

8. If you have a few people ________ on the rope, the box will be easier to move.

- Answer: pull
- Explanation: Pulling on a rope creates tension, which applies a force to the box. Having multiple people pull together increases the total force applied, making it easier to move the box.

---

9. ________’s theories on motion are still believed correct today.

- Answer: Newton
- Explanation: Sir Isaac Newton formulated the three laws of motion, which are fundamental principles in classical mechanics and are still widely accepted today.

---

10. We added wheels to our bureau to create less ________ when we move it.

- Answer: friction
- Explanation: Friction is the force that opposes motion between surfaces in contact. Adding wheels reduces the surface area in contact and changes sliding friction to rolling friction, which is much lower.

---

Final Answers:

1. force
2. machine
3. gravity
4. balance
5. energy
6. inertia
7. push
8. pull
9. Newton
10. friction

Final Answer Box:
\[
\boxed{\text{force, machine, gravity, balance, energy, inertia, push, pull, Newton, friction}}
\]