F2 2nd Term IS WS 01 Answers

2nd Term WS 01 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

9.1       Forces

i    Words to know:

	English term	Write the words again	Chinese term
1	Force		力
2	Motion		運動
3	Direction		方向
4	Speed		速度
5	Spring balance		彈簧秤
6	Newton		牛頓
7	Contact force		接觸力
8	Non-contact force		非接觸力

i    Skill development – Writing

1.      Amy throws the ball. Her force starts (starts/stops) the motion of the ball.

2.      Johnny catches the moving ball. His force stops the motion of the ball.

3.      A table tennis racket is hitting the table tennis ball. Its force changes the speed / direction

and the direction / speed of the motion of the ball.

4.      Johnny kicks the ball. His force starts the motion of the ball.

5.      The goalkeeper catches the ball. His force stops the motion of the ball.

6.      The tennis player is hitting the tennis ball. His force changes the speed and the direction of the motion of the tennis ball.

F2 IS QZ 11 anwers

1st Term QZ 11 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

8.4

Word Translation (7 marks)

i    Write down the English terms of the following Chinese terms:

	Chinese term	English term
1	銅	Copper
2	鎳鉻	Nichrome
3	電阻	Resistance
4	歐姆	Ohm
5	電阻	Resistance
6	滑動型變阻器	Sliding rheostat
7	旋轉式變阻器	Rotary-type rheostat

Fill in the Blanks (26 marks)

1     Resistance (1) of a conductor measures its opposition to the flow of electric current.

2     Copper wire conducts electricity better (1) than that of nichrome. This is because copper has a smaller opposition to the flow of electric current / free electrons (1)

than nichrome. That is, copper has a lower resistance (1) than nichrome.

3     The unit of resistance is ohm (1). Its symbol is W (1).

4     For the same voltage applied, the electric current flowing through a circuit will be larger (1) if the resistance is lower.

5     The resistance of a wire depends on its material (1), thickness (1) and length. For wire with the same length and thickness, a nichrome (1) wire has a higher resistance than a copper(1) wire.

For wires made of the same material and with the same length, a thinner (1) wire has a higher resistance.

For wires made of the same material and with the same thickness, a longer wire has a higher (1) resistance.

6     Resistors (1) are used to control the size of the electric current flowing through a circuit with a fixed value of resistance. A larger electric current can be obtained in a circuit by using one with a lower (1) value of resistance.

7     A rheostat (1) can also be used to control the size of an electric current flowing through a circuit because its resistance is variable (1). Two common types used in the laboratory are as follows:

Workbook Answers Chapter 8

Section 8.1 (P.51)

A. Concept checking

1.          False

2.          True

3.          False

4.          True

5.          True

B. Multiple choice

1.     (a)    electrical conductors

(b)    electrical insulators

2.     (a)    closed

        (b)    open

C. Question

1.     (a)    electrical insulator

(b)    electrical conductor

(c)    electrical insulator

(d)   electrical conductor

(e)    electrical insulator

(f)    electrical insulator

(g)    electrical insulator

(h)    electrical conductor

(i)     electrical conductor

2.

3.     (a)    (i)     will not

                (ii)    do not form

        (b)    (i)     will

                (ii)    form a closed circuit

        (c)    (i)     will

                (ii)    the bulb, the dry cells and the wires form a closed circuit

        (d)   (i)     will not

                (ii)    electrical energy in the circuit

4.     No. The wheels of the tram are connected with the power supply through the rails, and the circuit is complete. (or other reasonable answers)

Section 8.2 & 8.3 (P.54)

A. Multiple choice

1.     (a)    ampere

        (b)    volt

2.     free electrons

3.     1.5

4.     (a)    ammeter

        (b)    voltmeter

5.     larger

B. Question

1.     (a)    dry cell

(b)    wire

(c)    free electrons

Section 8.5
A. Multiple choice p.60-61
1. D
2. C
3. B
4. C

B. Question p.61-62
1.
(a) dry cell
(b) battery
(c) bulb
(d) ammeter
(e) voltmeter
(f) resistor
(g) rheostat
(h) switch

Integrated Exercise
A. Concept checking p.79
1. False
2. True
3. False
4. False
5. True
6. True

B. Multiple choice p.80-83

1. B

2. D

3. B

4. C

5. B

6. D

7. D

8. C

9. B

Quick Review
1. Electric current, voltage and resistance p.90
(a) open
(b) closed
(c) voltage
(d) larger
(e) resistance
(f) smaller
(g) current
(h) brighter

2. Ammeter, rheostat and fuse p.90
(a) rheostat
(b) resistance
(g) (electric) current
(h) black
(i) positive