# Kinematics

## Motion in one dimension

#### Free-Fall Experiment

RealVideo®
10:23 minutes (27:02 - 37:25)

Measurements of falling times for different heights and comparison to dimensional analysis.

Instructor: Prof. Walter Lewin
Prior Knowledge: Uncertainty

#### Bullet Time

RealVideo®
6:29 minutes (11:04 - 17:33)

Demonstrating and calculating the average velocity of a bullet, with considerations of uncertainty in measurement.

Instructor: Prof. Walter Lewin
Prior Knowledge: Speed and velocity

#### 1D Free Fall Demonstration

RealVideo®
9:48 minutes (41:20 - 51:08)

Demonstrating free-fall motion of an object, using strobe-lighting on a falling ball to show increasing velocity.

Instructor: Prof. Walter Lewin
Prior Knowledge: Dimensional Analysis (22:15 of V1), 1D Motion Equations (34:18 of V2)

#### Cross Product Using Corkscrew

RealVideo®
6:49 minutes (23:30 - 30:19)

Cross product calculation using sin(θ); finding direction by corkscrew method; and importance of right-handed coordinates. Demonstration of this method using a corkscrew in a potato.

Instructor: Prof. Walter Lewin
Prior Knowledge: Cross Product Using Determinants (19:42 of V3)

## Motion in Two Dimensions Including Projectile Motion

#### Projectile Motion Demonstration

RealVideo®
3:21 minutes (46:10 - 49:31)

A golf ball is fired directly upward from a moving cart and is then caught by the cart as the ball comes down, demonstrating that vertical and horizontal velocities of a projectile are independent.

Instructor: Prof. Walter Lewin
Prior Knowledge: Projectile Motion (37:02 of V3)

#### Horizontal Displacement Demo (1)

RealVideo®
11:24 minutes (13:48 - 25:12)

Demonstration of maximum horizontal displacement for projectile motion within calculated uncertainty for 45°.

Instructor: Prof. Walter Lewin
Prior Knowledge: Horizontal Displacement for Projectile Motion (8:42 of V4)

#### Horizontal Displacement Demo (2)

RealVideo®
10:18 minutes (25:12 - 35:30)

Demonstration of the same displacement for 30° and 60° with different times.

Instructor: Prof. Walter Lewin
Prior Knowledge: Horizontal Displacement for Projectile Motion (8:42 of V4)

#### Monkey in Free Fall

RealVideo®
6:38 minutes (45:23 - 52:01)

Demonstration that a ball fired at a monkey at the moment it begins free fall will still hit the monkey.

Instructor: Prof. Walter Lewin
Prior Knowledge: Free Fall Reference Frame (41:55 of V4)