1. What does simple machines do to our lives? It makes our works ____________

A. difficult B. easier C. happier D. lovelier

2. A pair of scissors is an example of what kind of simple machines?

A. lever B. pulley C. screw D. wedge

3. A seesaw is an example of what kind of simple machine?

A. lever B. pulley C. screw D. wedge

4. A ramp is an example of what kind of simple machines?

A. inclined plane B. lever C. pulley D. screw

5. A jackscrew is an example of what kind of simple machines?

A. lever B. pulley C. screw D. wheel and axle​​