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第七章 力

Total questions: 42

Worksheet time: 23mins

Name
Class
Date
1.
What is the definition of "weight"?
a)
measure of the force of gravity on your body
b)
the time it takes to get on a ride 
c)
the amount of matter in an object
d)
the size of an object
2.
A measure of how much matter an object has is--
a)
weight
b)
gravity
c)
mass
d)
volume
3.
The mass of an object ___________ as it moves away from the center of Earth
a)
stays the same
b)
decreases
c)
increases
d)
doubles
4.
As an object's mass increases, its gravitational pull will ____________.
a)
decrease
b)
increase
c)
stay the same
d)
get weaker
5.
what would happen to the force of gravity on you if you decreased in mass?
a)
the force of gravity would increase
b)
the force of gravity would decrease
c)
the force of gravity would remain the same
d)
your mass does not influence gravity
6.
Any object with mass has gravity.
a)
True
b)
Sometimes
c)
False
d)
Never
7.
If Earth's mass was cut in half, what would happen to your weight?
a)
Increase because gravitational force increases
b)
decrease because gravitational force decreases
c)
decrease because gravitational force increases
d)
nothing, weight is not affected by gravitational force
8.
A person would weigh less on on the Moon than on the Earth because . . .
a)
Moon has more mass, and therefore more gravity
b)
Moon has less mass, and therefore more gravity
c)
Moon has more mass, and therefore less gravity
d)
Moon has less mass and therefore less gravity
9.

Which has more mass?

a)

b)

10.

Which has more mass?

a)

b)

11.

Which is the universal force?

a)

elastic forces

b)

friction

c)

gravity

d)

inertia

12.

A place that has no air is called a ______.

a)

broom

b)

dustpan

c)

mop

d)

vacuum

13.

What is g?

a)

acceleration due to Earth's gravity

b)

gravitational force

c)

9.8 m/s2

d)

all the above

14.

We use a _________ to measure mass in ________.

We use a _________ to measure weight in _______.

a)

balance; kg; spring scale; N

b)

balance; N; spring scale; kg

c)

spring scale; N; balance; kg

d)

spring scale kg; balance N

15.

The more you compress an object, the _______ the ________ force.

a)

greater; elastic

b)

greater; gravitational

c)

less; elastic

d)

less; gravitational

16.

Rough Surfaces = ________ Friction

Smooth Surfaces = _______ Friction

a)

less; less

b)

less; more

c)

more; less

d)

more; more

17.

What type of friction?

a)

fluid

b)

sliding

c)

static

d)

rolling

18.

What type of friction?

a)

fluid

b)

sliding

c)

static

d)

rolling

19.

What type of friction?

a)

fluid

b)

sliding

c)

static

d)

rolling

20.

What type of friction?

a)

fluid

b)

sliding

c)

static

d)

rolling

21.

What type of friction?

a)

fluid

b)

sliding

c)

static

d)

rolling

22.

A rubber band keeps a newspaper tightly rolled because it

a)

can be tied tightly

b)

exerts elastic force

c)

is unbreakable

d)

none of the above

23.

The SI unit for force is _______.

a)

newtons

b)

joules

c)

watts

d)

amperes

24.

True or False: Friction acts in the opposite direction as motion.

a)

True

b)

False

25.

True or False: Friction acts in the opposite direction as motion.

a)

True

b)

False

26.

平衡状态下,两个力大小、方向一定一样。

a)

b)

27.

一个物体在两个力的作用下处于平衡状态,已知它受到的一个力大小为5N,方向朝左,那么另一个力的大小和方向分别为( )。

a)

5N,朝左

b)

5N,朝右

c)

10N,朝左

d)

10N,朝右

28.

静止在桌面上的茶杯,受到以下哪两个力而保持静止?

a)

重力和支持力

b)

重力和压力

c)

支持力和压力

d)

支持力和摩擦力

29.

平衡状态下,两个力大小、方向一定一样。

a)

b)

30.

如图6-29,吊灯的质量为5kg,则悬挂吊灯的悬链对吊灯的拉力?(g=10N/kg)

a)

大小约为5N,方向竖直向上

b)

大小约为5N,方向竖直向下

c)

大小约为50N,方向竖直向上

d)

大小约为50N,方向竖直向下

31.

划船的人用槳向後推水,船才能向前行駛,船是利用什麼力向前行駛?

a)

與水面摩擦力

b)

水的反作用力

c)

慣性

d)

槳的作用力

32.

雞蛋碰石頭,而雞蛋被石頭碰破,則下列敘述何者正確?

a)

雞蛋受力較大

b)

石頭受力較大

c)

兩者受力相等

d)

以上皆有可能

33.
8.任何一力必須具備哪三種要素?
a)
(A)大小、方向、空間
b)
 (B)方向、作用點、時間 
c)
(C)大小、方向、作用點
d)
 (D)大小、空間、作用點
34.

1.(单选题,1分)下列关于力的说法中,正确的是(  )

a)

相互作用力的两个力的作用点不同

b)

物体不接触不可能发生力的作用

c)

物体的重心一定在物体上

d)

力的三要素完全相同的两个力一定是平衡力

35.

(单选题,1分)关于弹簧测力计,下列说法正确的是(  )

a)

月球上不能用弹簧测力计测出力的大小

b)

弹簧测力计是测量重力的工具

c)

弹簧测力计上的字母“N“表示它的型号

d)

弹簧测力计是根据在弹性限度内,弹簧所受拉力越大,弹簧伸长量越长的原理制成的

36.

(单选题,1分)下列关于弹簧测力计的说法中正确的是(  )

a)

弹簧测力计使用前应先调零

b)

弹簧测力计只能测竖直方向上的力

c)

弹簧测力计可以测量任何大小的力

d)

在使用过程中,若弹簧与外壳有摩擦,并不影响测量结果

37.

(单选题,1分)如图甲所示,弹簧的一端挂在墙上,一人用4N的力F拉另一端,弹簧伸长了5cm;如图乙所示,两个人分别拉该弹簧的两端,弹簧也伸长了5cm,则每个人的力F分别为(  )

a)

4N、0

b)

0、4N

c)

4N、4N

d)

8N、8N

38.

(单选题,1分)下列物体的重力最接近2N的是(  )

a)

一只口罩

b)

一名中学生

c)

一部智能手机

d)

单个新冠病毒

39.

(单选题,1分)关于重力的理解,正确的一项是(  )

a)

重力的方向总是垂直向下的

b)

物体所受重力的大小与它的质量成正比

c)

物体的重心一定在物体上

d)

重力不随物体位置、形状、状态的变化而变化

40.

(单选题,1分)下列关于重力的说法,正确的是(  )

a)

重力就是地球的引力

b)

重力是物体自己具有的力

c)

重力的受力物体是地球

d)

重力的大小与质量有关

41.

9.(单选题,1分)关于重力和弹力,下列说法正确的是(  )

a)

物体的质量与物体的重力成正比,即G=mg

b)

形状规则的物体,其重心一定在它的几何中心

c)

地面对人的支持力是由于人发生弹性形变产生的

d)

在弹性限度内,弹簧的伸长量与其受到的拉力成正比

42.

(单选题,1分)月球对其表面物体的引力只有地球对地面物体引力的六分之一。设想我们乘宇宙飞船到达月球后,下列说法中正确的是(  )

a)

地球上质量为60kg的物体,在月球上质量只有10kg

b)

在地球上重为600N的人,在月球上重为100N

c)

一个金属球在月球上的密度仅为它在地球上的六分之一

d)

一根轻弹簧,在地球表面将它拉长1cm需要6N的拉力,在月球上只需要1N的拉力