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1D60.10 - Relativity Cart

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​1D60.10 - Relativity Cart

Title1D60.10 - Relativity Cart

Demonstrate that an object thrown upward while moving horizontally at a constant velocity will follow a parabolic projectile curve and land back in the cart.

Assembly Instructions

The relativity cart is a cart with a spring launcher that (when calibrated) launches the ball directly upwards.
Place the track on the table and level. Put the tunnel on the track right beside the photogate trigger. Adjust the photogate trigger so it will trigger the cart. Place the cart on the track and launch the ball. The ball launches when the photogate is triggered, so pass the cart is on, the launcher is set (by pressing on it) and the photogate is triggered.
Level the launcher depending on where the ball lands. The ball should land directly in or near the launcher.
Once the ball is calibrated, test the process while pushing the cart. If it catches the ball 4/5 times then it is well calibrated.

Setup Time15
Operation Time5
Preview Time5
Operation Instructions


1   Turn on the cart, and prime the ball by pressing it into the cart until the spring catches.
2   Launch the ball at the photogate trigger while the cart is stationary to show that it launches directly upwards.
3   Re-prime the cart by pressing the ball into the launcher.
4   This time push the cart so that it is travelling when the ball launches.
5   The ball will land in the cart even though the cart was travelling when it launched the ball.

Demo on DimeNo
PIRA 200Yes
Export Instructions (if different)
Category1 Mechanics
Subcategory1D - Motion in Two Dimensions
Keywordsprojectile motion, relativity
Construction Information
cart PASCO dynamics with ball launcher assembly
track dynamic 130 cm with attachments and feet
tunnel for dynamic track