1) during certain sports such as gymnastics and weightlifting we see players using rough powder on their hands to get a a) Better friction b) Friction c) Better grip d) Pull e) Push 2) The line in the tyre are called a) Grip b) Line c) Patterned grooves d) Snow 3) Which are _________increase friction and allow a better grip on the road a) Patered grooves b) Paaterned grooves c) Patterned grooves d) Pattened grooves 4) Lubricants are ___. Write the example a) Wax ,grease b) Tyre c) Ball bearing d) None of the above e) All of these 5) The force of friction due to air is called ____ a) None of the above b) Friction c) Drag

science

打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？