How Do Forces Make Things Move? A Fun Science Guide for Kids
How Do Forces Make Things Move? A Fun Science Guide for Kids
Have you ever kicked a soccer ball, pushed a toy car, or pulled a wagon? Have you wondered why some objects move while others stay in the same place?
The answer is force!
Forces are part of our everyday lives. They help us move objects, change their speed, turn them in different directions, and even stop them. In this fun science guide, we will explore how forces work and discover the difference between balanced and unbalanced forces.
What Is a Force?
A force is a push or a pull on an object.
You use forces every day, even when you do not notice them!
Here are some simple examples:
Pushing: You push a shopping cart to move it forward.
Pulling: You pull a wagon using its handle.
Kicking: You apply a force to a soccer ball to make it move.
Stopping: You apply a force with your foot to stop a rolling ball.
Forces can act when objects touch, such as when you push a box. Other forces, such as gravity and magnetism, can act without direct contact.
How Do Forces Change Motion?
A force can affect an object's motion in several ways.
Starting Movement
Imagine a toy car resting on the floor. When you push it, the car begins to move.
The push changes the car's motion.
Speeding Up
Imagine riding a bicycle. When you pedal harder, you can make the bicycle speed up, provided the forward force becomes greater than the opposing forces.
Slowing Down
What happens when a soccer ball rolls across the grass?
It gradually slows down because friction between the ball and the grass, along with other resisting forces, opposes its motion.
Changing Direction
Imagine hitting a moving ball with a bat. The force from the bat can change the ball's direction.
Forces do more than make things move. They can also change how objects are moving.
What Are Balanced Forces?
Balanced forces are forces that combine to produce a net force of zero.
Imagine two students pushing a box from opposite sides. One student pushes to the right with a force of 5 newtons, while the other pushes to the left with a force of 5 newtons.
The forces are equal and act in opposite directions.
The net force is:
5 N − 5 N = 0 N
Because the net force is zero, the box's motion does not change due to these forces alone.
If the box is resting, it stays at rest. If it is already moving, it continues moving at a constant velocity unless another force changes its motion.
What Are Unbalanced Forces?
Unbalanced forces occur when the forces acting on an object produce a net force that is not zero.
Imagine two students pushing the same box. One pushes to the right with 8 newtons, while the other pushes to the left with 3 newtons.
The net force is:
8 N − 3 N = 5 N to the right
The forces are unbalanced because the net force is not zero.
The box accelerates to the right. Depending on its initial motion, it may start moving, speed up, slow down, or change direction.
Balanced vs. Unbalanced Forces
Here is a simple comparison to help you remember the difference.
| Balanced Forces | Unbalanced Forces |
|---|---|
| The net force is zero. | The net force is not zero. |
| They do not change an object's motion. | They change an object's motion. |
| Equal forces in opposite directions balance each other. | Unequal opposing forces create a net force. |
| Example: A book resting on a table. | Example: A soccer ball being kicked. |
Remember: an object can move even when its forces are balanced. What matters is whether its motion changes.
Real-Life Examples of Forces
Let's look at some familiar situations.
A book on a table: Gravity pulls the book downward, while the table pushes upward. These forces balance when the book is resting on the table.
A soccer ball being kicked: The kick applies a force that changes the ball's motion.
A shopping cart: Pushing harder can make the cart accelerate if the forward force exceeds the opposing forces.
A bicycle turning: Forces acting on the bicycle and its tires help change its direction.
A magnet attracting a paper clip: Magnetic force can pull the paper clip without the magnet touching it.
These examples show that forces are everywhere!
Try These Fun Science Activities
You do not need an expensive science lab to explore forces. You can learn a lot with simple materials.
Activity 1: Push a Toy Car
Materials: A toy car and a flat surface.
Place the toy car on the floor.
Give it a gentle push.
Push it again with a stronger push.
Observe how its motion changes.
Think about it: What happened when you pushed the car harder?
Activity 2: Roll a Ball on Different Surfaces
Materials: A small ball, a smooth floor, and a carpet.
Roll the ball across the smooth floor.
Roll it across the carpet.
Compare how far the ball travels.
Think about it: Which surface made the ball slow down more quickly? Why?
Activity 3: Explore Balanced Forces
Materials: A box and two people.
Ask two people to push opposite sides of the box with equal forces.
Observe whether the box's motion changes.
If it is safe, compare what happens when one person pushes harder.
Think about it: How does the net force affect the box's motion?
Always perform these activities safely and use objects that are appropriate for your age and surroundings.
Test Your Science Knowledge
Answer these questions to see what you have learned.
Question 1: What is a force?
A. A push or a pull
B. A type of color
C. A sound
Question 2: Two students push a box with equal forces in opposite directions. What is the net force?
A. 5 N
B. 0 N
C. 10 N
Question 3: A toy car experiences a net force to the right. What happens to its motion?
A. Its motion changes according to the net force.
B. It must always stop immediately.
C. Nothing can ever happen.
Question 4: Can an object move while experiencing balanced forces?
A. No, never.
B. Yes, it can move at a constant velocity.
C. Only if it is a magnet.
Question 5: What force helps slow a rolling ball on grass?
A. Friction
B. Light
C. Sound
Answer Key
A — A push or a pull.
B — 0 N.
A — Its motion changes according to the net force.
B — It can move at a constant velocity.
A — Friction.
Final Thoughts
Forces help explain why objects start moving, speed up, slow down, stop, and change direction.
The most important idea to remember is that balanced forces produce zero net force, while unbalanced forces produce a nonzero net force.
By observing everyday objects and trying simple experiments, you can become a force detective and discover the science behind motion!
Make Science Learning More Fun
Looking for a hands-on way to help elementary students understand forces and motion?
Explore Balanced and Unbalanced Forces Task Cards from Teaching is The Future. This printable resource is designed for Grades 3–5 and can support science centers, partner activities, classroom review, and independent practice.
Help your students explore force diagrams, calculate net force, predict changes in motion, and build confidence with physical science concepts.
Teaching is The Future — Making Learning Fun, One Activity at a Time!
