问题 实验题

在做“互成角度的两个力的合成”实验时,在水平放置的木板上垫一张白纸,把橡皮条的一端固定在木板的A点上(如图1—13),另一端连接两根细线然后通过细线用两个互成角度的弹簧秤拉橡皮条,使橡皮条伸长到某一点O,此时记录下(1)       ,(2)         ,(3)          。然后,改用一个弹簧秤把橡皮条拉到(4)     点后再记录下(5)         ,(6)          

答案

(1)O点位置,(2)两条细线方向,(3)两弹簧秤读数;(4)O,(5)细线方向,(6)弹簧秤读数。

在实验中必须确保橡皮筋拉到同一位置,即一力的作用效果与两个力作用效果相同.同时我们需要记录下力的大小和方向.所以我们需要:通过细绳套用两个互成角度的弹簧秤拉橡皮条,使结点移到某一位置O,此时需记下:①O点位置(效果)②细绳所示方向(方向)③相应弹簧秤读数(分力的大小),然后用一个弹簧秤把橡皮条拉长,使结点到达::①O点位置(效果)②细绳所示方向(方向)③相应弹簧秤读数(合力的大小).

故答案为: O点位置;细绳所示方向;相应弹簧秤读数;O点位置;弹簧秤读数;橡皮条方向

选择题
阅读理解

Shopping is not as simple as you may think! There are all sorts of tricks at play each time we reach out for that particular brand of product on the shelf.

Colouring, for example, varies according to what the producers are trying to sell. Health foods are packaged in greens, yellows or browns because we think of these as healthy colours. Ice cream packets are often blue and expensive goods, like chocolates, are gold or silver.

When some kind of pain killer was brought out recently, researchers found that the colours turned the customers off because they made the product look weak and ineffective. Eventually, it came on the market in a dark blue and white package—blue because we think of it as safe, and white as calm.

The size of a product can attract a shopper. But quite often a bottle doesn’t contain as much as it appears to.

It is believed that the better-known companies spend, on average, 70 percent of the total cost of the product itself on packaging!

The most successful producers know that it’s not enough to have a good product. The founder of Pears soap, who for 25 years has used pretty little girls to promote (推销) their goods, came to the conclusion: “Any fool can make soap, but it takes a genius to sell it.”

小题1:Which of the following may trick a shopper into buying a product according to the text?

A.The cost of its package.

B.The price of the product.

C.The colour of its package.

D.The brand name of the product.小题2:The underlined part “the colours turned the customers off” (in Para.3) means that the colours _________.

A.attracted the customers strongly

B.caused the customers to lose interest

C.tricked the customers into shopping

D.had weak effects on the customers小题3:Which of the following is the key to the success in product sales?

A.The way to promote goods.

B.The discovery of a genius.

C.The team to produce a good product

D.The brand name used by successful producers.小题4:Which of the following would be the best title for this text?

A.Choice of Good Products

B.Disadvantages of Products

C.Effect of Packaging on Shopping

D.Brand Names and Shopping Tricks