What is power?

(a)  

What is energy?

(a)  

Work done on an object can be transformed into what?

(a)  

What are the units of work?

(a)  

What are the units of all kinds of energy?

(a)  

What are the units of power?

(a)  

What are the units of weight?

(a)  

There are three W in this chapter. What are they? How do you tell the difference?

(a)  

Rather than grabbing any random W in solving for power, which W must you choose?

(a)  

Lift a 20 kg block 2 m at a constant velocity. How much work did YOU do?

(a)  

Lift a 20 kg block 2 m at a constant velocity. How much work did the WEIGHT do?

(a)  

Lift a 20 kg block 2 m at a constant velocity. How much net work was done?

(a)  

If an object increases speed (a)   net work must have been done on it.

If an object slows (a)   net work must have been done on it.

You apply 200 N of force horizontally on a 30 N weight sliding 4 m horizontally in a time of 10 seconds. How much power did you develop?

(a)  

A watt is a a___ per ___.

(a)  

You still don't have your reference tables out do you?

(a)  

A 20 kg box is dragged horizontally at a constant speed with a 30 N forward force. What is the friction force?

(a)  

A free body diagram shows ...

(a)  

As you walk along the hall in this building how much air friction force is applied to you?

(a)  

As you walk along the hall in this building how much forward force must you apply to overcome air friction?

(a)  

The FBD of you traveling along the hall would include (a)   forces - name them.

The pulling force and the friction force are the same for an object pulled horizontally at a constant velocity.

(a)  

Weight and mass are the same

(a)  

Do work to lift something at a constant velocity and that work turns into KE and grav PE.

(a)  

Pull a spring twice as far and you have to apply (a)   the force

double the height for the same mass and you have (a)   the grav PE

Triple the speed and you have (a)   times the KE

Double the compression displacement of a spring a the elastic potential energy is multiplied by

(a)  

what is k?

(a)  

Give a situation where force is applied but there is no work done

(a)  

Give a situation where there is force and displacement but no work done

(a)  

Your hair dryer is labeled as 1875 W. How many hp is that?

(a)  

My motorcycle is rated at 48 hp. How many kW is that?

(a)  

If you pull (or push) an object on a horizontal surface with an angle to the horizontal which component of the force must you use to calculate work?

(a)  

Which makes the work easier, pulling with an angle 'above' the horizontal or pushing with an angle 'below' the horizontal? ('above' is also 'below' depending on your perspective - "vertical angles" from geometry)

(a)  

While climbing the stairs to find your maximum power what did your FBD look like? How many forces?

(a)  

While climbing the stairs to find your maximum power what force did you use to calculate the work done on your by you?

(a)  

While climbing the stairs to find your maximum power what force did you use to calculate the work done on your by you?

(a)  

While climbing the stairs to find your maximum power what displacement did you use to calculate work?

(a)  

How many horsepower can you as a normal human produce over just a few seconds?

(a)  

How do you know if an object has KE?

(a)  

A 20 N force east is applied to an objec that moves 2 m east. What is the direction of the force?

(a)  

A 20 N force east is applied to an objec that moves 2 m east. What is the direction of the displacement?

(a)  

A 20 N force east is applied to an objec that moves 2 m east. What is the direction of the work?

(a)  

A car is traveling 50 mph north. What is the direction of its velocity?

(a)  

A car is traveling 50 mph north. What is the direction of its kinetic energy?

(a)  

A boulder is held high above your head. What is the direction of its gravitational potential energy?

(a)  

While solving Law of Conservation of Energy problems the thermal energy can go on either side of the equation.

(a)  

While solving Law of Conservation of Energy problems the gravitational potential energy could be on both sides - both.

(a)  

Elastic PE is ...

(a)  

During the spring activity you graphed two quantities. What were they?

(a)  

During the spring activity you graphed Force (y) vs displacement (x) and found the slope. What were the units of that slope?

(a)  

During the spring activity you graphed Force (y) vs displacement (x) and found the slope. What did that slope represent?

(a)  

A car has 30 MJ of kinetic energy. How much work was done to get it from rest to that speed?

(a)  

A car has 30 MJ of kinetic energy. How much net work was done to get it from rest to that speed?

(a)  

A car has 30 MJ of kinetic energy. How much net work must be done to stop it?

(a)  

A 20 kg box is dragged 3 m horizontally at a constant speed with a 30 N forward force. How much work is done by friction?

(a)