Ch3 G8

When the output force occurs over a shorter distance than the input force, which is true?

• The output force and input force are equal

• The output force is less than the input force

• The output force is greater than the input force

• The answer depends on the direction of the output force

Which feature cannot be changed by a machine?

• the amount of work needed to accomplish a task

• the ease with which you can accomplish a task

• the direction of force used to accomplish a task

• the amount of force used to accomplish a task

Which is used in calculations of mechanical advantage?

• work

• force

• distance

• power

Which is used in calculations of efficiency?

• work

• force

• distance

• power

For work to be done on object, the applied force must move the object __

• in the opposite direction of motion

• in the same direction of motion

• in all direction

• upward

machine can make the work easier by

• change the size of force

• change the size of surface area

• change the drag force

• change the pressure

screwdriver is

• lever

• pulley

• inclined plane

• wheel and axle

__ made of two or more machines that operate together

• simple machine

• mixed machines

• compound machines

• work

the length of distance between input force and fulcrum is

• output arm

• input arm

• output work

• input work

mechanical advantage of third class lever is always

• equal one

• greater than one

• less than one

• equal zero