Question

6.5) describe the two ways simple machines can make work easier. use complete sentences.
a.

b.

choose the best answers.
6.6) which three examples show work being done?
□ a woman pushes against a door, but the door does not open.
□ a man pushes a dresser, and it moves across a room.
□ a batter hits a ball that is thrown, and its direction changes.
□ a child sits on a pillow that is on the floor.
□ a dog leans its paws against a tree, and the tree stays in the same place.
□ a child pushes a toy train around a track.

Explanation:

For 6.5: Simple machines reduce the force needed for work by increasing distance, and they change the direction of applied force to make tasks easier.
For 6.6: Work is defined as force applied to an object that causes displacement. Only options where the object moves due to the applied force count as work done.

Answer:

6.5
a. Simple machines can reduce the amount of force needed to perform a task by increasing the distance over which the force is applied.
b. Simple machines can change the direction of an applied force, allowing people to exert force in a more convenient or natural direction to complete work.

6.6
☑ A man pushes a dresser, and it moves across a room.
☑ A batter hits a ball that is thrown, and its direction changes.
☑ A child pushes a toy train around a track.