Shaina uses a shovel to dig a hole to plant a tree. A shovel is an example of a compound machine because it is made up of what two simple machines?

What type of simple machine is used to pull a flag up to the top of a flagpole?

David wants to remove the top from a gallon paint can. What kind of simple machine should he use as a tool?

Sam was learning how to roller-skate. He did not want to go fast. On which kind of floor surface would Sam travel the slowest?

Which best explains why a person using a ramp can load heavy boxes onto a truck more easily than a person can using only human strength?

Which term refers to the rate of change of motion?