1. 11.2 muscles & bones
Instructional Guide Technological Systems: Creating Mechanical Toys .
LEVERS. They help us to move ourselves…or other objects. Levers are used to apply forces.
How Simple are Simple Machines? -Machines helps us lessen the amount of effort or work we use, and also to increase our ability to lift or move objects.
Levers Simple Machines. Levers are used to help lift heavy objects.
