F2 Forces – Multiple Choices


ID# 1974
1.

The unit of force is

A) newton
B) ampere
C) ohm
D) volt
2.

A force can change the __________ of an object.

  1. speed
  2. weight
  3. direction of motion
  4. shape
A) 1、3 and 4
B) 1 and 4
C) 3 and 4
D) 1、2 and 3
3.

Forces can be measured by

  1. ammeter
  2. newton balance
  3. voltmeter
  4. spring balance
A) 2 and 3
B) 1 and 3
C) 2 and 4
D) 1 and 2
4.

Catching a football will change its

  1. speed
  2. direction of motion
  3. shape
A) 1 only
B) 3 only
C) 1 and 2
D) 2 only
5.

Striking a volleyball changes its

  1. speed
  2. direction of motion
  3. shape
A) 1 only
B) 1 and 2
C) 2 only
D) 3 only
6.

Pressing on an inflated balloon【充氣氣球】 changes its

  1. speed
  2. direction of motion
  3. shape
A) 1 only
B) 2 only
C) 1 and 2
D) 3 only
7.

For an  object sliding on a surface, the friction can be reduced【降低】 by

  1. using rolling beads
  2. adding lubricant between the object and the surface
  3. supporting the object on an air cushion
A) 1 and 3
B) 1、2 and 3
C) 1 and 2
D) 2 and 3
8.

Which of the following things/objects have streamlined【流線型】 shape to reduce resistance?

  1. luggage
  2. fish
  3. racing cars
  4. rollers on the conveyor belt
A) 2 and 4
B) 3 and 4
C) 2 and 3
D) 1 and 2
9.

Which of the following things/objects using rolling beads to reduce resistance?

  1. window hinges
  2. luggage
  3. hovercraft
  4. rollers on the conveyor belt
A) 2 and 3
B) 3 and 4
C) 1 and 2
D) 2 and 4
10.

Which of the following things/objects using air cushion to reduce resistance?

  1. racing cars
  2. luggage
  3. hovercraft
  4. air hockey
A) 1 and 3
B) 1 and 2
C) 2 and 4
D) 3 and 4
11.

Which of the following things/objects using lubricant to reduce resistance?

  1. window hinges
  2. take a ring off a finger
  3. hovercraft
  4. air hockey
A) 1 and 3
B) 1 and 2
C) 2 and 3
D) 2 and 4
12.

Which of the following are an example of using friction positively?

  1. bath mats
  2. parachutes
  3. window hinges
  4. bicycle brakes【自行車剎車】
A) 1、3 and 4
B) 2、3 and 4
C) 1、2 and 4
D) 1、2 and 3
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