phy_2.5_Moment 力矩 1

The equation of calculating moment is

計算力矩的公式是

• τ = F m

• τ = F s

• τ = F d

• τ = F v

What is the unit of moment?

力矩的單位是甚麼?

• N s

• N s^-1

• N m

• N m^-1

Find the direction of the moment produced by the force F about point O.

指出力 F 對 O 點所產生的力矩方向。

• upwards　向上

• right 向右

• clockwise 順時針

• anticlockwise 逆時針

Find the moment about point B by the force.

求該力對點B的力矩。

• 100 Nm (clockwise 順時針)

• 100 Nm (anticlockwise 逆時針)

• 1 Nm (clockwise 順時針)

• 1 Nm (anticlockwise 逆時針)

Find the moment about point O by the force.

求該力對點O的力矩。

• 0.5 Nm (clockwise 順時針)

• 0.5 Nm (anticlockwise 逆時針)

• 50 Nm (clockwise 順時針)

• 50 Nm (anticlockwise 逆時針)

Find the moment about point A by the force.

求該力對點A的力矩。

• 0

• 0.5 Nm (clockwise 順時針)

• 1 Nm (clockwise 順時針)

• 10 Nm (clockwise 順時針)

Find the magnitude and direction of the moment produced by the force about the hinge.

求圖中力對門鉸產生的力矩量值和方向。

• 800 N m（clockwise 順時針）

• 400 N m（clockwise 順時針）

• 8 N m（clockwise 順時針）

• 4 N m（clockwise 順時針）

Find the net moment about the centre O of the rod.

求對棒中心點O的淨力矩。

• 0.1 Nm (anticlockwise 逆時針)

• 0.2 Nm (clockwise 逆時針)

• 10 Nm (clockwise 逆時針)

• 20 Nm (clockwise 逆時針)

Find the net moment about point B

求對點B的淨力矩。

• 0.4 Nm (clockwise 逆時針)

• 1.6 Nm (clockwise 逆時針)

• 40 Nm (clockwise 逆時針)

• 160 Nm (clockwise 逆時針)

Find the net moment about the point C.

Take the clockwise direction as positive.

求對點C的淨力矩。

取順時針方向為正。

• 0

• 20 Nm

• - 20 Nm

• - 40 Nm