Weekly Weather Report for Luzern, Switzerland. Looking at the weather in Luzern, Switzerland over the next 7 days, the maximum temperature will be 23â (or 73â) on Sunday 9th April at around 1 pm. In the same week the minimum temperature will be -2â (or 28â) on Friday 7th April at around 4 am.
The forces at work in buoyancy. Note that the object is floating because the upward force of buoyancy is equal to the downward force of gravity. In science, buoyancy ( /ËbÉÉª.Énsi, -Éntsi/ or /ËbuËjÉnsi, -jÉntsi/;) or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.
Upthrust. 1  A fluid will exert a force upward on a body if it is partly or wholly submerged within it. 2  This is because the deeper into a fluid you go, the greater the weight of it and so the greater the pressure.3  This difference in pressure between the top and the bottom of the object produces an upward force on it. A fluid will exert a force upward on a body if it is partly or wholly submerged within it. 2  This is because the deeper into a fluid you go, the greater the weight of it and so the greater the pressure. 3  This difference in pressure between the top and the bottom of the object produces an upward force on it.