Torque is in this direction; spin angular momentum's in this direction.

力是这个方向，旋转角动量是这个方向。

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This causes the applied force to act as a torque, which therefore gives the ball a spin.

这将导致作用力产生一个扭矩，使球旋转。

youdao

So the torque is persuading the spin angular momentum to change.

所以力是使得旋转的角动量,改变的理由。

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If you're a frequent reader you're surely well aware of the potential of spin torque transfer memory, or STT-MRAM, and how spin-polarized magnetic currents (and the electrons they love to caress) might hold the potential to revolutionize storage as we know it.

ENGADGET: IBM's prototype STT MRAM device spins your bits right round, baby, right round

During a recent LSI technology event EverSpin was showcasing its recently announced spin-torque MRAM memory that provides a non-volatile replacement for DRAM.

FORBES: Pumping Iron and Keeping Cool

TOKYO-Toshiba Corporation (TOKYO: 6502) today announced that the company has developed a prototype memory element for a spin transfer torque magnetoresistive random access memory (STT-MRAM) that achieves the world's lowest1 power consumption yet reported, indicating that it has the potential to surpass the power consumption efficiency of SRAM as cache memory.

ENGADGET: Toshiba goes perpendicular to solve MRAM's power issues, rethink cache memory