Work and Simple Machines

Which of the following is work according to the scientific definition?

• pushing a box across the floor
• standing still while holding something heavy
• walking with a backpack on
• all of these are considered "work"

Work only occurs when the direction of motion and direction of force are in the same direction.

• TRUE
• FALSE

How does a single fixed pulley make work easier?

• It changes the direction of the force.  It is easier to pull downward.
• It increases the size of the force required by decreasing the distance.

Tags

NGSS.MS-ETS1-1

Which lever makes it easier to lift a load (box)? 

• a
• b
• c
• the 3 levers are all the same

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

Simple machines reduce work, less work is done.

• TRUE
• FALSE

Which shows work being done? (1 answer)

• sitting
• holding
• lifting
• carrying

Tags

NGSS.MS-PS3-5

Moving an object 15 m with 2N of force equals 12J of work.

• TRUE
• FALSE

Is this person doing work?

• YES
• NO

Which simple machine converts a downward force into a horizontal force, which is useful in splitting an object into two parts?

• An inclined plane

• A wedge

• A pulley

• A screw

What do you call the pivot point on a lever?

• The input force

• The output force

• The fulcrum

• The angle