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Balls move because they have energy, and that energy changes when they roll, bounce, and stop. Young learners can see this in everyday play with playground balls, toy balls, and soft balls at home or school. Watching how high a ball bounces helps children notice patterns. It also builds early science thinking through simple cause and effect.
When a ball hits the floor, it pushes on the floor and the floor pushes back on the ball. Some balls bounce high because they keep more of their motion, while others lose more energy to sound, heat, or squishing. Soft rugs, grass, and pillows usually make balls bounce less than hard floors or sidewalks. Collisions also show that when objects touch, they can change speed, direction, or stop.
Key Facts
- A ball with more speed usually bounces higher after it hits a hard surface.
- Hard floors usually make balls bounce more than soft rugs or grass.
- A soft ball can squish more, so it often bounces less than a firm ball.
- When two objects collide, they can bounce apart, slow down, or stop.
- A bigger push usually makes a ball move faster or farther.
- Energy can change during a bounce into motion, sound, warmth, and squishing.
Vocabulary
- energy
- Energy is what helps something move, bounce, or change.
- bounce
- A bounce is when a ball hits a surface and comes back up.
- collision
- A collision is when two things hit each other.
- surface
- A surface is the floor, ground, rug, or table that something touches.
- motion
- Motion means an object is moving from one place to another.
Common Mistakes to Avoid
- Thinking all balls bounce the same, but different balls are made of different materials so they do not keep motion the same way.
- Thinking a soft rug makes a ball bounce higher, but soft surfaces absorb more energy so the ball usually comes back up less.
- Thinking the ball bounces by itself after hitting the floor, but the floor pushes back on the ball during the collision.
- Thinking a harder push only changes distance, but it can also change how fast the ball moves and how high it bounces.
Practice Questions
- 1 A red ball is dropped on a hard gym floor and then on a soft rug. On which surface will it probably bounce higher, and why?
- 2 A child rolls one ball gently and another ball strongly toward a basket. Which ball will likely reach the basket faster, and what caused that difference?
- 3 A rubber ball and a soft foam ball are dropped from the same height onto the same floor. Which one will probably bounce higher, and what does that tell you about how the two balls change energy during the collision?