Lever and PulliesStreaming Video - 2014
Senna often helps her grandfather in his vehicle recycling company in the Netherlands. If she needs to remove the wheels of a car, she uses a jack. A jack is very handy because it is a lever. With levers you don't need much strength to lift heavy objects. Senna starts to investigate the power of levers and pulleys among the old cars of her grandfather. She builds a secret drawer that can only be opened using a lever, she cracks a walnut with a door and she tries to lift a car using only muscle power and a few pulleys.
Publisher: [Place of publication not identified] : Nederlandse Publieke Omroep, 
Copyright Date: ©2014
Branch Call Number: STREAMING VIDEO
Characteristics: video file,rda 1 online resource (1 video file (13 min., 2 sec.)) : sound, color