Turn on thread page Beta
 You are Here: Home >< Physics

# Physics Query watch

1. When a ball falls through a liquid at constant speed, what are the forces acting on it. I know that the forces are viscous drag, weight and upthrust but how do they differ in size to each other? Can anyone show with the help of a diagram.
2. (Original post by ranataw)
When a ball falls through a liquid at constant speed, what are the forces acting on it. I know that the forces are viscous drag, weight and upthrust but how do they differ in size to each other? Can anyone show with the help of a diagram.
If it's a constant speed, the downwards force (weight) is equal to the sum of the upwards forces (drag and upthrust). The exact values of drag and upthrust would vary depending on the density of the ball and the viscosity of the liquid.

Turn on thread page Beta

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 15, 2017
Today on TSR

### Summer Bucket List is Back!

Start yours and you could win £150!

### GCSE Physics Equations sheet!

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE