This wooden machine is elegantly designed and easy for students to use. It comes with a built in mass but the cart has a shallow indent for adding additional mass if needed. Students can study several different simple machine concepts with this piece of apparatus and in particular that inclined planes increase mechanical advantage by increasing the distance travelled while decreasing the amount of force required. Ideal for demonstrating Year 5: Forces & GCSE PHYSICS: Contact & non-contact forces resultant forces work done energy transferSupplied with manual.Size: 42 x 9 x 5 cmWeight: 700g.