Work & Power Problems
⦁ What are the correct units for work? What is the formula for work?
⦁ The unit for Force is .
⦁ For something to be considered “work”, distance must be in the direction of .
⦁ Give one example of work being done in everyday life.
⦁ What are the correct units for POWER? What is the formula for power?
⦁ In the power lab, the students with less mass produced [MORE OR LESS] power.
⦁ In the power lab, which students had to do the most work to get up the stairs?
⦁ Calculate the work done by a 47 N force pushing a pencil 0.26 m.
⦁ Harold places a force of 30 N. on an object and it moves a distance of 14 m. How much work was done on the object?
⦁ You must exert a force of 4.5 N on a book to slide it across a table. If you do 2.7 J of work in the process, how far have you moved the book?
⦁ A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?
⦁ How much work is done on a small car if a 3150 N force is exerted to move it 75.5 m to the side of the road?
⦁ A crate is being lifted into a truck. If it is moved with a 2470 N force and 3650 J of work is done, then how far is the crate being lifted?
⦁ If 16,700 J of work is done to shoot the human cannonball down a 3.05 m barrel, then how much force is applied to the person to fire them out the cannon?
⦁ An elephant pushes with 2000 N on a load of trees. It then pushes these trees for 150 m. How much work did the elephant do?
⦁ How much power does it take to lift 30.0 kg 10.0 m high in 5.00 s?
⦁ You move a 25 N object 5.0 meters. How much work did you do?
⦁ A 190,000 W engine can accelerate from rest to a top speed in 9 s. How much work did the engine do?
⦁ If a runner exerts 350 J of work to make 125 W of power, then how long did it take the runner to do the work?
Electricity Problems
⦁ Do insulators or conductors allow electrons to move easily through?
⦁ Give one example of a conductor and one example of an insulator.
⦁ Lightning is an example of what kind of electricity?
⦁ What was happening when John Travolta’s foot was rubbed on the carpet?
⦁ Potential difference is another term used for .
⦁ Define current.
⦁ is measured in Ohms.
⦁ is measured in Amperes (A).
⦁ The amount of resistance depends on what? (list 2 things)
⦁ What is a closed path through which electrons can flow?
⦁ State the Ohm’s Law formula.
⦁ As current decreases, voltage .
⦁ As resistance increases, voltage .
⦁ Calculate the current in the circuit below. 13. Calculate the resistance in the circuit below.
(The symbol E in the image below is equivalent to Voltage, V.)
14. Calculate the voltage in the circuit below.
15. What are 2 differences between a parallel circuit and a series circuit?
16. What is the formula for electrical power? What are the correct units?
