<|im_start|>user
What causes that feeling of weightlessness when you're on a rollercoaster?<|im_end|>
<|im_start|>assistant
The feeling of weightlessness when you’re on a rollercoaster is caused by negative gravitational force, also known as g-force. Negative g-force occurs when you accelerate downwards, and is commonly felt in roller coaster elements like camelback hills, which are hump-shaped hills that travel straight up and down. Elements like these are designed to lift riders out of their seats, giving that feeling of weightlessness.<|im_end|>
