Work
If a force is applied but an object doesn't move, is work done? Why or why not?
No because the object must move in the same direction
Provide an example that possesses kinetic energy
Anything that moves
A bike has a mass of 17 kg and travels at 21.60 meters per second. Find the kinetic energy. Round to the nearest whole number.
3,966 J
A crane does 56 J of work to lift the object across the field for 13 seconds. How much power was generated by the crane? Round to the nearest hundredth.
4.31 Watts
During the popsicle stick catapult lab, identify when potential and kinetic energies were displayed.
Potential: When the catapult is bent and ready to release the projectile
Kinetic: The release of the catapult arm, and the projectile soaring in the air
Find the work demonstrated of a 22 Newton desk chair that travels 5 meters.
110 J
Determined by how active an objects atoms are, this type of energy relies upon heat.
Thermal
How much potential energy does a 13.0 Newton vase have when resting on a counter that is 3.46 meters off of the ground?
44.98 J
A gazelle utilizes 672 J of work when sprinting in the savannah for 24 seconds. Find the power used in this example.
28 Watts
Explain how all three conditions of work were displayed in the paper roller coaster lab.
- a force must be applied
- the force must cause the object to move
- The force and distance must be in the same direction
How is work defined in physics, and what are its units?
A change in energy due to the application of force over a given distance. Work's units are Joules.
The experience of riding a roller coaster demonstrates which primary energy transformations?
Potential to Kinetic
or Electrical/Chemical
Find the kinetic energy of a 0.41 kg hockey puck traveling at 8.77 meters per second. Round to the nearest hundredth.
15.77 J
Mr. McCarthy exhibits 136 J of work when lifting a couch across a room for 4.65 seconds. Find the power demonstrated in his effort. Round to the nearest tenth.
29.2 Watts
What is a projectile?
A missile designed to be fired from a source that accelerates its distance and impact.
For a ball to be rolled 18.96 m with a force of 1.42 N, determine how much work was displayed during this action. Round to the nearest hundredth.
26.92 J
What form of energy is possessed when a lightning strike appears?
Electrical
Determine the potential energy of the 249 Newton roller coaster cart that is suspended 127.64 meters above the surface.
31,782.36 J
Spiderman uses 230,784 J of work to prevent a metal beam from falling for 29.79 seconds. How much power did Spiderman use in an attempt to save the Manhattan people?
7,747.0292 Watts
In the stair climber lab, which attempt contained the most amount of power? Fast or slow pace? Why?
Fast pace because the time had decreased, but the amount of work remained the same.
Work uses the same units as
Energy
Converting energy collected from a solar panel to then charge your phone is displaying what type of energy transformation?
Radiant to Electrical
A trampoline sends a 95.1 kg person 2.08 meters off the ground. What is the gravitational potential energy at this height? Round to the nearest hundredth. (note: g=9.8 m/s2)
1,938.52 J
Mario pushes his stalled out go kart with 80.917 J of work for a total of a 4.767 seconds before slipping on a banana. How much power did Mario exhibit during the race? Round to the nearest thousandth.
16.974 Watts
In the stair climb lab, what data did we need to measure and collect in order to calculate for the power exhibited on each attempt?
The Work in Joules, the Time in Seconds.