DE -- Introduction to Work

Whenever work is done, energy is ____.

• transferred

• cancelled

• duplicated

• accelerated

Tags

NGSS.HS-PS3-4

According to the scientific definition of work, what 2 things must be done? (choose 2 answers)

• force applied

• displacement

• energy created

• balanced forces

What does the d represent in the equation?

• density

• displacement

• direction

• dimension

In the picture, why is zero work done on the briefcase carried by the man?

• energy is not being transferred

• displacement is not in the same direction as the applied force

• gravity does not act horizontally

• there is nothing inside the briefcase

Is work being done on the briefcase if it is carried up the stairs?

• no, because the displacement is not in the direction of the applied force

• yes, because a component of the force is in the direction of the displacement

• yes, because the total amount of mechanical energy is conserved

Is work being done on the briefcase by the hand carrying it?

• YES

• NO

What are the units for work and energy?

• horsepower

• watts

• joule

• newtons

Net work is defined to be ____.

• the total displacement of an object

• the sum of work done on an object

• the sum of forces on an object

For a package moving on a conveyor belt, no work is done by gravity or the normal force because ___.

• those forces are not measurements of energy

• those forces are perpendicular to the displacement

• those forces are constant

Tags

NGSS.HS-PS2-1

Where does the net force on the package come from?

• the force of friction and the displacement

• the displacement

• the applied force

• the applied force and friction

Tags

NGSS.HS-PS2-1