Exam 13: Energy and Power

What is the SI unit for work?

What is the SI unit for kinetic energy?

In the absence of heat transfer, and assuming negligible losses and no work, conservation of mechanical energy states that the total mechanical energy of a system is

In general, efficiency is defined as

Work is found by multiplying force by what other physical quantity?

Power is found by dividing work by what other physical quantity?

Thermal energy transfer is called

What is the SI unit for elastic energy?

The SI unit for power is

Energy is a fundamental dimension.

A stone is dropped from a bridge and allowed to free-fall downward. As it falls a certain distance its gravitational potential energy decreases by 1000J . By how much does the stone's Kinetic energy increase? (Neglect air resistance).

In the following equation, what does the k stand for? $\text { elastic energy }=\frac{1}{2} k x^{2}$

A team is more powerful than an individual because

What are the SI units for heat?

How much kinetic energy does a 3kg soccer ball have while moving at $20 \mathrm {~m} / \mathrm { s }$ toward your opponents' goal?

In the following equation, what does the x stand for? $\text { elastic energy } = \frac { 1 } { 2 } k x ^ { 2 }$

Power can be described as

How much kinetic energy does a soccer ball have while moving at $20 \mathrm {~m} / \mathrm { s }$ toward a goal?

The change in gravitational potential energy is found by multiplying an object's change in elevation by its

The time rate of doing work is called