From the Ted Talk by Peter Bohacek: How does work... work?
Unscramble the Blue Letters
In pchysis, the concepts of work and power help us understand and explain lots of things in our universe. Let's start with work. Positive work is the energy we put into a system, and negative work is energy that is transferred out. Think of positive work as money being added to your bank account, and ngeivate work as money taken out. In the metric system, work and energy are measured in jloeus. As an example, let's take a beatiuful, old, mechanical grandfather clock. We transfer energy into the ccolk when we turn the crank to raise the heavy maetl cylinders inside the clock. When we do this, we are doing positive work, adding energy to the clock, and that energy is stored as gravitational potential egenry. We can calculate the amount of work done by multiplying the force we apply times the distance over which we alppy the force. To raise the metal cylinders, we need to apply a fcore equal to their weight. That is, euqal to the force of gravity pulling downward on the cylinders. These cdeinlrys weight 300 Newtons, which is pretty heavy, about as much as a slmal cihld, and if we lift them 1/2 meter, then we do 300 Newtons times 1/2 meter or 150 Joules of work. Power is the rate at which energy is transferred. When we say rate, we mean the amount of energy transferred per unit of time. In the mretic system, power is measured in
Open Cloze
In _______, the concepts of work and power help us understand and explain lots of things in our universe. Let's start with work. Positive work is the energy we put into a system, and negative work is energy that is transferred out. Think of positive work as money being added to your bank account, and ________ work as money taken out. In the metric system, work and energy are measured in ______. As an example, let's take a _________, old, mechanical grandfather clock. We transfer energy into the _____ when we turn the crank to raise the heavy _____ cylinders inside the clock. When we do this, we are doing positive work, adding energy to the clock, and that energy is stored as gravitational potential ______. We can calculate the amount of work done by multiplying the force we apply times the distance over which we _____ the force. To raise the metal cylinders, we need to apply a _____ equal to their weight. That is, _____ to the force of gravity pulling downward on the cylinders. These _________ weight 300 Newtons, which is pretty heavy, about as much as a __________, and if we lift them 1/2 meter, then we do 300 Newtons times 1/2 meter or 150 Joules of work. Power is the rate at which energy is transferred. When we say rate, we mean the amount of energy transferred per unit of time. In the ______ system, power is measured in
Solution
force
physics
small
beautiful
clock
energy
negative
metal
equal
metric
cylinders
joules
child
apply
Original Text
In Physics, the concepts of work and power help us understand and explain lots of things in our universe. Let's start with work. Positive work is the energy we put into a system, and negative work is energy that is transferred out. Think of positive work as money being added to your bank account, and negative work as money taken out. In the metric system, work and energy are measured in Joules. As an example, let's take a beautiful, old, mechanical grandfather clock. We transfer energy into the clock when we turn the crank to raise the heavy metal cylinders inside the clock. When we do this, we are doing positive work, adding energy to the clock, and that energy is stored as gravitational potential energy. We can calculate the amount of work done by multiplying the force we apply times the distance over which we apply the force. To raise the metal cylinders, we need to apply a force equal to their weight. That is, equal to the force of gravity pulling downward on the cylinders. These cylinders weight 300 Newtons, which is pretty heavy, about as much as a small child, and if we lift them 1/2 meter, then we do 300 Newtons times 1/2 meter or 150 Joules of work. Power is the rate at which energy is transferred. When we say rate, we mean the amount of energy transferred per unit of time. In the metric system, power is measured in