Ball in Cup Experiment


Good morning scientists! Last night my little scientist made a video showing how you can get a ball to fall in a cup without touching the ball. Think your little scientist can use the power of science to get a ball into the cup too? Check out my little scientist demonstrating this cool “trick” using science.

MaterialsBall in Cup Experiment (2)

Large Cup


Toilet Paper Roll

Small Ball


1. Setup your experiment by placing a plate on top of a cup. Center your toilet paper tube in the middle of the plate so that it is standing up. Put your ball on top of your toilet paper tube.Ball in Cup Experiment (3)

2. Grab the edge of the plate and quickly pull it towards you. The toilet paper tube should fall over and the ball will fall into the cup. (It might take a bit of practice)

Talking Points

Why did the ball fall in the cup? The answer is Newton’s First Law of Motion. Newton’s First Law of Motion states that an object at rest will remain at rest, and an object in motion will remain in motion unless acted upon by an outside force. In our experiment the ball is resting or sitting still until the toilet paper tube it is sitting on moves. When you pulled the plate out it causes the toilet paper tube to fall over. The ball is still resting until this happens, this slight delay gives the ball a large enough window to clear the plate and toilet paper tube, falling straight down into the waiting cup. The ball is pulled straight down by gravity.

Gravity is the force that pulls an object towards a larger object, on planet Earth the Earth is the largest object. So on planet Earth all objects are pulled down to the ground. 

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