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
1,600 joules
1,600 joules
400 joules
400 joules
100 joules
To find the work done by the person, we need to multiply the force applied by the distance over which the force is applied.
Work = Force x Distance
Work = 400 newtons x 4 meters
Work = 1600 joules
Therefore, the person did 1600 joules of work.
Which list correctly orders effort (E), fulcrum (F), and load (L) for each lever class?(1 point)
Responses
class 1 = F, E, L (or L, E, F)
class 2 = F, L, E (or E, L, F)
class 3 = L, F, E (or E, F, L)
class 1 = F, E, L (or L, E, F) class 2 = F, L, E (or E, L, F) class 3 = L, F, E (or E, F, L)
class 1 = L, F, E (or E, F, L)
class 2 = F, L, E (or E, L, F)
class 3 = F, E, L (or L, E, F)
class 1 = L, F, E (or E, F, L) class 2 = F, L, E (or E, L, F) class 3 = F, E, L (or L, E, F)
class 1 = F, E, L (or L, E, F)
class 2 = L, F, E (or E, F, L)
class 3 = F, L, E (or E, L, F)
class 1 = F, E, L (or L, E, F) class 2 = L, F, E (or E, F, L) class 3 = F, L, E (or E, L, F)
class 1 = F, L, E (or E, L, F)
class 2 = F, E, L (or L, E, F)
class 3 = L, F, E (or E, F, L)
The correct order for each lever class is:
class 1 = F, E, L (or L, E, F)
class 2 = L, F, E (or E, F, L)
class 3 = F, L, E (or E, L, F)
So the correct answer is:
class 1 = F, E, L (or L, E, F)
class 2 = L, F, E (or E, F, L)
class 3 = F, L, E (or E, L, F)
How do simple machines make work easier?(1 point)
Responses
They magnify the force being applied, thereby decreasing the work they can do with no extra energy exerted by the person using the machine.
They magnify the force being applied, thereby decreasing the work they can do with no extra energy exerted by the person using the machine.
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 increase the distance over which a force is needed, doing more work with less force.
The correct answer is:
They reduce the amount of force needed to move an object to do the same amount of work.
Simple machines allow us to apply a smaller amount of force over a greater distance in order to accomplish the same amount of work. This makes the task easier for us by reducing the amount of force required.
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
80 Joules
80 Joules
196 Joules
196 Joules
40 Joules
40 Joules
392 Joules
To find the work done, we need to calculate the force applied (in newtons) multiplied by the distance over which it is applied (in meters).
The force applied is 98 newtons and the distance over which it is applied is 4 meters. Thus, the work done to lift the box is:
Work = Force x Distance
Work = 98 newtons x 4 meters
Work = 392 joules
Therefore, the work done is 392 joules.