is used. A lever, like a seesaw, can lift something heavy when you push on one end. A pulley uses a wheel and rope to help lift loads, such as raising a flag. An inclined plane is a ramp that lets you move an object upward without lifting straight up. These machines do not remove the need for work, but they can make the work feel easier by spreading the force over distance. A playground can be fun, yet simple machines also help people build and move things in everyday life. Which sentence best states the main idea?