Work, energy, power and simple machines

Use this for “A crate is pulled 15 m across a floor by a 40 N force at 30° above level. How much work does the force do?”

Use this for “A 60 kg student runs up 4.5 m of stairs in 6 s. How much work does she do, and what is her power?”

Use this for “A 600 N load sits 0.4 m from the fulcrum, and you push 1.6 m from it. What is the mechanical advantage, and what effort lifts it?”

Use this for “Four strands hold up an 800 N crate and the pulleys are 80% efficient. What pull lifts it, and how much rope do you pull to lift it 0.5 m?”

Use this for “A 900 N crate is pushed up a 3 m ramp onto a 1 m platform. What is the ideal mechanical advantage and the effort? What if the ramp is 75% efficient?”

Use this for “A spring (k = 400 N/m) pressed 0.15 m launches a 0.5 kg block over 0.5 m of floor with 2 N of friction. How high up the smooth ramp does it go?”

Use this for “Describe the energy changes as a person bounces on a pogo stick (or a trampoline).”