1.Two books are dropped from different heights: Book A, with a mass of 450 g, is dropped from a height of 350 cm; Book B, with a mass of 300 g, is dropped from a height of 500 cm. Which book does more work?
2.In a grade 8 classroom, five students demonstrate different amount of work done by doing different things. Tommy lifts a 4500 g object 50 cm up from the ground. Clare holds a 1kg object 50 cm over her head. Steven pushes a 10 kg box across the floor with a force of 70 N for a distance of 3.5 m. Jeff drops a 500 g mass from the desk top that sits 80 cm from the floor. And Kelly kicks a ball 8 m across the room with a force of 15 N. Order each student’s name from the least amount of work done to the greatest amount of work done.
3.William pushes a cargo box up a 4 m ramp to load onto a platform that is 80 cm above the ground. The cargo has a mass of 30 kg.
a.What is the IMA of using the ramp?
b.How much work needs to be done to lift just the cargo up?
c.How much work does William need to do through using the ramp if input force is 100N?
4.If a person is required only a quarter amount of work because he’s using a machine, and the force of the load is 120 N, how much force does he need to put in? What is the mechanical advantage of this machine?
