Work
What is the formula for work?
Work = Force x distance
What is the formula for power?
Power = work / time
What is kinetic energy?
The energy of motion
What is potential energy?
Stored energy or energy of position
Which has more kinetic energy (Assuming mass is constant):
An object moving at 3 m/s, 5 m/s, or 4 m/s
5 m/s
What is the unit for work? Include the symbol as well
Joules (J)
A machine does 1,200 joules of work in 4 seconds. What is the power output of the machine?
Power = 300 W
What is the formula for KE?
KE = 1/2 mass x velocity2
What is the formula for gravitational potential energy?
GPE= mass x gravity x height
What is the force of acceleration due to gravity on Earth?
9.8 m/s2
A person pushes a box with a force of 40 N over a distance of 12 meters. Calculate the work done.
Work = 480 J
A car engine does 3,000 joules of work in 30 seconds. What is the power generated by the engine?
Power = 100 W
A 500 kg car is moving at a speed of 20 m/s. What is the car's kinetic energy?
KE = 100,000 J
A 20 kg object is lifted to a height of 10 meters. What is the gravitational potential energy?
GPE = 1,960 J
Which object has greater GPE: A book on a shelf 3 ft above the ground, a book on a shelf 5 feet above the ground, or a book on a shelf 8 feet above the ground?
8 feet
A car exerts a force of 1,000 N to move a distance of 20 meters. How much work is done by the car?
Work = 20,000 J
A person pushes a box with a force of 50 N over a distance of 10 meters in 5 seconds. Calculate the power the person exerts on the box.
Power = 100 W
A 50 kg object is moving with a velocity of 10 m/s. What is its kinetic energy?
KE = 2,500 J
A 5 kg book is placed on a shelf 3 meters high. Calculate the gravitational potential energy.
GPE = 150 J
How can you increase the elastic potential energy in a rubber band?
Pull it back further
A force of 250 N is applied to an object, and 2,000 joules of work are done. How far does the object move?
Distance = 8 meters
A worker applies a constant force of 100 N to move an object 15 meters in 10 seconds. How much power does the worker use in this task?
Power = 150 W
A 1500 kg truck is traveling at 15 m/s. Calculate the truck's kinetic energy.
KE = 168,750 J
A 75 kg person climbs a ladder to a height of 8 meters. What is their gravitational potential energy at that height?
GPE = 5,880 J
Name 3 types of potential energy.
Nuclear, magnetic, gravitational, chemical, elastic