A person pushes a box. He applies a force of 400 newtons, and he pushes the box for a distance of 4 meters. After he stops pushing, the box slides forward another meter. How much work was done by the person?(1 point)
Responses
2,000 joules
2,000 joules
100 joules
100 joules
400 joules
400 joules
1,600 joules
1,600 joules
In this pulley system, the pulleys will ____ the mechanical force required to lift the block and will change the ____.
(1 point)
Responses
increase; direction of the force
increase; direction of the force
increase; the weight of the block
increase; the weight of the block
decrease; the weight of the block
decrease; the weight of the block
decrease; the direction of the force
decrease; the weight of the block
How do simple machines make work easier?(1 point)
Responses
They reduce the amount of force needed to move an object to do the same amount of work.
They reduce the amount of force needed to move an object to do the same amount of work.
They decrease the distance needed between a person and an object, allowing the person to apply more force and do more work.
They decrease the distance needed between a person and an object, allowing the person to apply more force and do more work.
They magnify the force to be applied, thereby decreasing the work they can do with no extra energy exerted by the person using the machine.
They magnify the force to be applied, thereby decreasing the work they can do with no extra energy exerted by the person using the machine.
They increase the distance over which a force is needed, doing more work with less force.
They reduce the amount of force needed to move an object to do the same amount of work.
A person using a lever applies 98 Newtons to lift a 20-kilogram box. They apply the force over a distance of 4 meters to lift the box a distance of 2 meters. How much work is done?(1 point)
Responses
40 Joules
40 Joules
196 Joules
196 Joules
392 Joules
392 Joules
80 Joules
392 Joules
Where is the fulcrum in this situation?
(1 point)
Responses
It is the point where the person's hands push down the bar.
It is the point where the person's hands push down the bar.
It is the point where the bar touches the boulder.
It is the point where the bar touches the boulder.
It is the point where the bar touches the smaller rock.
It is the point where the bar touches the smaller rock.
It is the point where the boulder touches the ground.