Science - Grade 4 - QED - Free Printable

This worksheet is designed for a hands-on science experiment. Because the answers depend on measurements you take in your classroom (like how far a ball rolls or how long a string is), there are no single correct numbers that I can give you. You must do the experiments to get the right answers.

However, I can help you understand what to look for and how to predict what will happen in each box so you can fill them out correctly.

Step-by-Step Guide to Solving Each Box

1. Friction
* What to do: You are likely rolling a toy car down a ramp covered with different materials.
* Prediction: Friction slows things down.
* Ramp only: This is usually smooth. The car will go the farthest.
* Ramp and felt: Felt is fuzzy and creates friction. The car will stop sooner than on the bare ramp.
* Ramp and sandpaper: Sandpaper is very rough. It creates the most friction. The car will stop the quickest (shortest distance).
* How to answer: Measure the distance in inches for each. The "Ramp only" number should be the biggest, and "Sandpaper" should be the smallest.

2. Swinging Force
* What to do: You are swinging a weight on strings of different lengths.
* Prediction: Shorter strings swing faster; longer strings swing slower.
* How to answer: You probably timed how many swings happened in 10 or 15 seconds.
* 3 inch string: Should have the highest number of swings.
* 5 inch string: Should have the lowest number of swings.

3. Energy and Force
* What to do: Using a launcher (like a catapult) to shoot an object.
* Prediction: Pulling the arm back further stores more energy.
* How to answer: Measure how far the object flew.
* Launcher Arm All the Way Down: Should travel the farthest distance.
* Launcher Arm Halfway Down: Should travel a shorter distance.

4. Magnetic Force
* What to do: Seeing if a magnet can pull a paperclip through cardboard.
* Prediction: Magnets can pull through thin things like paper or thin cardboard, but the force gets weaker.
* How to answer:
* Without cardboard: Write "Yes" or the distance it moved.
* With cardboard: Write "Yes" (if the cardboard is thin) or "No" (if it's thick). Usually, it still pulls, but maybe not as strongly.
* Is magnetic force a push or pull? The answer is Pull (attraction) or Push (repulsion). In this context, it is usually a Pull.

5. Ball Drop
* What to do: Dropping a ball from different heights.
* Prediction: Gravity pulls the ball down. The higher you drop it, the harder it hits the ground.
* How to answer: You might be measuring how high it bounces back up.
* 80 cm drop: Should bounce the highest.
* 20 cm drop: Should bounce the lowest.

6. Balloon Race
* What to do: Letting air out of balloons to make them fly across a string.
* Prediction: More air means more force (Newton's 3rd Law: Action/Reaction).
* How to answer: Measure how far they traveled.
* Full: Goes the farthest.
* One-fourth full: Goes the shortest distance.

7. Ball Roll
* What to do: Rolling different balls down a ramp.
* Prediction: Heavier, denser balls usually roll farther because they have more momentum and are less affected by air resistance.
* How to answer:
* Golf Ball: Heavy and hard. Rolls far.
* Tennis Ball: Lighter and fuzzy (friction). Rolls less far than the golf ball.
* Ping Pong Ball: Very light. Air stops it easily. Rolls the shortest distance.

8. Testing Gravity
* What to do: This likely involves dropping objects or seeing where they land.
* Prediction: Gravity pulls everything down toward the center of the Earth.
* How to answer: If this is about where a ball lands after rolling off a table:
* The speed it rolls affects how far out it goes, but gravity pulls it down at the same rate.
* If "Highest line" means starting higher up, it has more time to fall or more speed. Usually, Higher start = Farther distance.

9. Bumper Cars
* What to do: Rolling a car into a block or another car.
* Prediction: Starting higher gives the car more potential energy, which turns into speed (kinetic energy).
* How to answer:
* Car at the top of ramp: Hits with the most force (moves the bumper the farthest).
* Car at the middle of the ramp: Hits with less force.

──────────────────────────────────────

Final Answer:
You must perform the experiments to get the specific numbers. However, here are the expected results to help you check your work:

1. Friction: Ramp only > Ramp and felt > Ramp and sandpaper (Distance decreases).
2. Swinging Force: 3-inch string swings fastest (most swings); 5-inch string swings slowest.
3. Energy: Arm all the way down travels farther than halfway down.
4. Magnetic Force: Magnet works without cardboard. With thin cardboard, it still works. Magnetic force is a Pull (or Push, depending on pole orientation, but usually Pull in these tests).
5. Ball Drop: 80 cm drop results in the highest bounce; 20 cm is the lowest.
6. Balloon Race: Full balloon travels farthest; 1/4 full travels shortest.
7. Ball Roll: Golf ball rolls farthest; Ping Pong ball rolls shortest.
8. Testing Gravity: Higher starting lines generally result in greater distance/speed due to gravity.
9. Bumper Cars: Car from top of ramp moves the target more inches than the car from the middle.