P2 Work and Energy

What is the unit used to measure work?

• Joule
• Watt
• Newton
• Pascal

 Work done = Force x _________

• a. distance
• b. acceleration
• c. velocity
• d. speed

What kind of energy is in a moving skateboard?

• Potential
• Kinetic

What kind of energy is in a rock that is stationary at the edge of a cliff?

• Gravitational potential

• Kinetic

If W=Fd
Then how much work is done if it takes 20N to move a box 10 meters

• 0 J

• 2 J

• 200 kg

• 200 J

In which of the following situations do your arms do work on books?

• holding a heavy stack of books while standing
• carrying a heavy stack of books
• dropping a stack of books onto a table
• picking up a pile of books from the floor

When work is done, there is always a(n) _______.

• constant rate
• single movement involved
• transfer of energy
• increase in the mechanical advantage

The ability to do work is....

• work
• power
• acceleration
• energy

In which of the following is no work done

• climbing stairs
• lifting a book
• pushing a shopping car
• none of the above

If you exert a force of 10 N to lift a box over 1 m, how much work do you do?

• 11 J

• 10 J

• 5 J

• 20 J