在冬奥会滑雪比赛时,运动员用力撑雪杖使自己从山上由静止加速滑下,这表明力能使物体的____发生改变;如图所示是某运动员在滑下过程中碰撞标志杆时的情景,它说明力还能使物体发生____.

已知一个棱长为2的正方体，被一个平面截后所得几何体的三视图如图所示，则该几何体的体积是（   ）

    People in the UK spend their free time in different ways. They usually use it to relax. They spend a lot of their free time at home. The most popular activity is watching TV. People in the UK watch TV for about 25 hours a week. They often record (录制) programs so they can watch them later. Reading is also a popular way of spending free time. People in the UK spend a lot of time reading newspapers and magazines. Many people in the UK have pets. They like playing with their pets in their free time.

    In summer， gardening (园艺) is popular. And families often have a “day out” on the weekend. They often go to a festival or see a show. Young people like to go to clubs， and people of all ages like to go to the cinema.

    In winter， “do-it-yourself” is popular. People often spend their free time repairing (修理) houses.

    Some free time activities are with friends. Asking friends for a drink or a meal at home is the most usual one. Sometimes people and their friends have dinner in a restaurant.

    On the weekend， people in the UK like to spend their free time doing sports. The popular kinds of sports are soccer， horse racing， swimming， tennis， skating， climbing and hill walking.

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