Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

# Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography

Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

 Choose a Topic or Enter a keyword to search: I cannot find what I want! You have selected the following Demos: None Selected

Choose a subtopic:
Measurement
Motion In One Dimension
Motion In Two Dimensions
Angular Displacement
Whirligig
video  - Spinning Tray
Centripetal Force
Spinning Chain
Centripetal Acceleration
Rotational Dynamics
video  - Ballistics Cart
video  - Shoot and Drop
Projectile Motion II
video  - The Monkey and the Hunter
video  - Range Gun
Newton's First Law
Newton's Second Law
Newton's Third Law
Statics Of Rigid Bodies
Applications Of Newton's Laws
Gravity
Work and Energy
Momentum
Rotational Motion
Properties of Matter

### video  - Range Gun

#### Purpose:

To show how the range of a projectile depends on its initial velocity and angle of inclination.

#### Procedure:

Use pieces of tape to mark where the ball lands on the table or use a box or bucket to catch the ball. The level on the gun shows the angle at which the projectile is launched. This information can be used to find the initial velocity of the ball. Change the angle on the gun and predict where the ball will land using the previously calculated initial velocity. The ball velocity can be set to three different levels by how far one presses the ball into the gun spring assembly, 1-click, 2-clicks or 3 clicks.

### Phet Simulation - Projectile Motion

#### Hints:

At the "short range" setting (first click) the maximum range of the ball is just under 2 meters so the 2-meter stick set on the table is a convenient measuring device. Have a student stand in front or behind the bench to mark the position where the ball lands.

One can show for a ball shot out of the gun at same initial velocity but two different angles (which add up to 90 degrees), the range is the same. For example, when fired at 30 and 60 degrees, the ball makes it into a bucket both times.

#### Equipment:

• Range gun apparatus