Scene 1

Scene 2

The product of Force and displacement covered in the direction of force. Mathematically                                       	   W= F.d

Scene 3

W =  Fdcos  Ɵ Where   F = Applied Force d = distance covered Ɵ =  angle between F and d

A person pushing a lawn mower with a force F. Force is represented by a vector making an angle theta below the horizontal and distance moved by the mover is represented by vector d. The component of vector F along vector d is F cosine theta. Work done by the person, W, is equal to F d cosine theta.

Scene 4

Work is a scalar quantity. Its unit is Newton meter ( N.m ) and SI unit is Joule.

A person is pushing a heavy crate up a ramp. The force vector F applied by the person is acting parallel to the ramp.

Scene 5

Work done may be positive negative and zero

Scene 6

Positive work: Force and displacement are parallel to each other. The angle between F and d is zero. Mathematically, W = F d cosƟ          where cos 0 = 1 W= F d

Scene 7

Negative work: When force and displacement are antiparallel to each other work done is negative. Work done against Gravitational force is always negative. Mathematically, W = F d cosƟ                                                                            cos 180 = -1 W = - F d

Scene 8

Zero work: 	When the force and displacement are perpendicular to each other the work done is zero.

Diagram

Description automatically generated

Scene 9

Work done is also zero when either force and displacement is zero

Scene 10

Scene 11

A force of 50 N  act on the cart at the angle of 30 as shown in figure. The cart move horizontal distance of 30 m . How much work is done by the applied force .

Scene 12

A child is sitting inside a wagon and being pulled by a boy with a force F at an angle thirty degrees upward from the horizontal. F is equal to fifty newtons, the displacement vector d is horizontal in the direction of motion. The magnitude of d is thirty meters.

Work

Page 1 (0s)

Page 2 (9s)

Page 3 (26s)

Page 4 (47s)

Page 5 (1m 8s)

Page 6 (1m 18s)

Page 7 (1m 36s)

Page 8 (1m 50s)

Page 9 (2m 15s)

Page 10 (2m 32s)

Page 11 (2m 40s)

Page 12 (2m 57s)

Page 13 (3m 14s)

Page 14 (3m 38s)