F2 IS 2nd Term WS01 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      Fill in the blanks:

1      A force can:

         start the motion of an object; stop the motion of an object;

         change the direction / speed of motion of an object; and

         change the speed / direction of motion of an object.

2      In a school laboratory, we can use a spring balance to measure forces.

         The unit of force is newton and the symbol is N.

3       Contact forces are forces that act on objects through direct contact.

4       Non-contact forces are forces that act on objects without direct contact.