1) A force that happens whenever an object slides or rolls over something. a) Friction b) Gravity c) Buoyancy 2) Friction tends to a) Speed up moving objects b) Slow down moving objects 3) Rough surfaces a) have a lot of friction. b) have less friction. 4) Friction always acts a) opposite to the direction that the object is moving in. b) same direction that the object is moving in. 5) Friction causes a) light to be generated b) heat to be generated 6) force acting opposite to the relative motion of any object moving with respect to a surrounding fluid. a) Thrust b) Drag 7) One way to reduce friction a) Waxing b) Ironing 8) We need friction to a) Write b) Read

Friction

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？