Net Forces worksheet with interactive questions and force diagrams for physics education.

Here is the completed worksheet with explanations for each answer.

---

Fill in the blanks with appropriate words.

1. A force is a push or pull.
* *Explanation:* In physics, a force is defined as any interaction that, when unopposed, will change the motion of an object. This interaction is commonly described as a push or a pull.

2. An unbalanced force causes a change in motion.
* *Explanation:* According to Newton's First Law of Motion (the law of inertia), an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Therefore, an unbalanced force changes an object’s state of motion (speeds it up, slows it down, or changes its direction).

3. The NET force of balanced forces is zero.
* *Explanation:* Balanced forces are forces acting on an object that are equal in magnitude but opposite in direction. They cancel each other out, resulting in a net force of zero. When the net force is zero, the object’s motion does not change.

4. If NET force of all the forces acting on the body is not zero, the forces are called unbalanced forces.
* *Explanation:* If the vector sum of all forces acting on an object is not zero, the forces are unbalanced. This results in a change in the object’s motion (acceleration).

5. The UNIT for force is the newton. It is abbreviated N.
* *Explanation:* The SI unit of force is the newton, named after Sir Isaac Newton. It is symbolized by the letter "N". One newton is the force required to accelerate a one-kilogram mass at a rate of one meter per second squared (1 N = 1 kg·m/s²).

6. NET FORCE means the overall force acting on an object when all the individual forces are combined.
* *Explanation:* Net force is the vector sum of all forces acting on an object. It determines the object’s acceleration according to Newton’s Second Law (F_net = m × a). If forces are in opposite directions, you subtract them; if they are in the same direction, you add them.

---

Observe the figures and fill boxes with correct answers.

#### Box 1: Yellow Cube
* Forces: Two 5 N forces act horizontally — one to the right, one to the left.
* Total NET Force: 0 N
* *Calculation:* 5 N (right) + (-5 N) (left) = 0 N.
* Movement Direction: No movement (or remains at rest)
* *Explanation:* Since the net force is zero, the forces are balanced. The cube will not accelerate. If it was at rest, it stays at rest. If it was moving, it continues at constant velocity.

#### Box 2: Red Book
* Forces: Two 9 N forces act horizontally — one to the right, one to the left.
* Total NET Force: 0 N
* *Calculation:* 9 N (right) + (-9 N) (left) = 0 N.
* Movement Direction: No movement (or remains at rest)
* *Explanation:* Again, balanced forces result in zero net force. The book will not accelerate.

#### Box 3: Toy Car
* Forces: A 20 N force acts to the right, and a 13 N force acts to the left.
* Total NET Force: 7 N to the right
* *Calculation:* 20 N (right) + (-13 N) (left) = +7 N → 7 N to the right.
* Movement Direction: To the right
* *Explanation:* The net force is not zero and points to the right. The car will accelerate to the right.

#### Box 4: Soccer Ball
* Forces: A 10 N force acts downward, and a 7 N force acts upward.
* Total NET Force: 3 N downward
* *Calculation:* 10 N (down) + (-7 N) (up) = +3 N → 3 N downward.
* Movement Direction: Downward
* *Explanation:* The net force is downward, so the ball will accelerate downward.

---

✔ Final Completed Worksheet Answers:

Fill in the blanks:
1. push or pull
2. motion
3. zero
4. unbalanced forces
5. newton, N
6. the overall force acting on an object when all the individual forces are combined

Observe the figures:
- Yellow Cube: Total NET Force: 0 N, Movement Direction: No movement
- Red Book: Total NET Force: 0 N, Movement Direction: No movement
- Toy Car: Total NET Force: 7 N to the right, Movement Direction: To the right
- Soccer Ball: Total NET Force: 3 N downward, Movement Direction: Downward