Our physics expert picks his top-five equations, plus a scheme to supply US power needs with a bucket of baseballs. Thanks, ...

The Pentagon signaled earlier this week that Air Force C-17s could be used to fly deportation flights. That's happening now.

So weight is a gravitational force on an object that has mass. The weight of an object may be thought of as acting at a single point called its centre of mass. Depending on the object's shape ...

Historians say Donald Trump's plan for mass deportations echos calls to drive out immigrants during the 1930s and the 1950s.

This means that a 1 kg mass would be attracted to Earth by a force of 10 N. The weight of the student is 450 N. This is calculated by multiplying their mass by the gravitational field strength.