#  Impulse, Work, and Energy 

 



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### Egg Throw

\[L | t+ | —\]  
Students are invited to throw a raw egg as hard as they please. The egg does not break when caught in a sheet.

### Karate Blow

\[M | t+ | ★★★★\]  
The instructor breaks several boards with a swift blow of the hand.  
  
\[[In-Depth Description](/presentations/karate-blow)\]

### Carnival Milk Bottle Trick

\[L | t+ | ★★★★\]   
To knock over a wooden milk bottle, would you use a ball that rebounds or one that does not?

### Pencil Blow Gun

\[L | t++ | —\]  
A blow gun shoots a pencil through a board.

### Toilet Paper

\[ M | t+ | ★\]  
Toilet paper is torn off a roll by a quick yank but not by a slow pull.  
  
\[[In-Depth Description](/presentations/toilet-paper)\]

### Marginal String

\[M | t | —\]  
A weight is suspended by a marginally strong string. Pulling on the weight with a similar string breaks the former, depending on the impulse.

### Pile Driver

\[M | t | —\]  
A falling weight drives a nail through a board.

### Gravi Car

\[L | t+ | ★★\]  
A falling weight propels a car forward.  
  
\[[In-Depth Description](/presentations/gravi-car)\]

### Wind-Up Truck

\[M | t | —\]  
A wound-up spring propels a toy truck.  
  
\[[In-Depth Description](/presentations/wind-truck)\]

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu