無標題簡報

Multiple Choice

In the example provided, if the work done (W) is 450 J and the time (t) is 5 seconds, what is the power (P) calculated?

• 90 W

• 45 W

• 225 W

• 180 W

Multiple Choice

If 2.0 J of work is done in raising a 180 g (0.180 kg) apple, how far is it lifted?

• 1.1 m
• 11 m
• 3.5 m
• 35 m

Open Ended

Explain how potential energy is converted to kinetic energy during free fall as described in the image.

Open Ended

What does the law of conservation of energy state?

Multiple Choice

What is the relationship between elastic potential energy and the deformation of an object?

• Elastic potential energy is independent of deformation

• Elastic potential energy increases with deformation

• Elastic potential energy decreases with deformation

• Elastic potential energy is constant regardless of deformation

Multiple Choice

What is the relationship between gravitational potential energy and height?

• The higher the height, the lower the potential energy

• The potential energy is independent of height

• The potential energy increases with height

• The potential energy decreases with height

Multiple Choice

What are the forms of energy transformation mentioned in the text?

• Light energy

• Heat energy

• Electrical energy

• Mechanical energy

Multiple Choice

請說明何謂「槓桿」？判斷該機械為省力或是費力裝置？並以功能轉換原理解釋。

• 省力裝置

• 費力裝置

• 無法判斷

• 不適用

Multiple Choice

請說明何謂「斜面」？判斷該機械為省力或是費力裝置？並以功能轉換原理解釋。

• 省力裝置

• 費力裝置

• 無法判斷

• 不適用

Fill in the Blank

Which class of lever is a wheelbarrow?

_______________________________

Multiple Choice

The ____________ consists of a rod attached to a wheel, and makes it easier to move or turn things. A door knob is an example of this simple machine.

• lever

• pulley

• wheel and axle

• wedge

Multiple Choice

A 50 kg skier starts from rest at the top of a 50 m high slope. Ignoring friction, what is the skier's speed at the bottom of the slope? (Use $$g = 9.8 \, \text{m/s}^2$$ )

• 10 m/s

• 14 m/s

• 31.3 m/s

• 98 m/s

Poll

您現在對這個話題有多大信心？

• 非常自信
• 有點自信
• 不自信