Work
What is the SI Unit for Work?
Joule (J)
Work is only done when components of a force are ___ to a displacement
parallel
What is the SI Unit for Power?
Watt (W)
What is the formula for Kinetic Energy?
KE=1/2(m)(v)2
What is the formula for (gravitational) Potential Energy
PE=mgh
What is the formula for Work
Work=(F-force)(D- distance)
What is the formula for the Work Energy Theorem?
W=1/2(m)(v)2f - 1/2(m)(v)2i
Define Power
Power is the rate at which work is done
Define Kinetic Energy
The energy of an object due to its motion, depends on speed and mass
What is the formula for (elastic) Potential Energy
PE=1/2(k- spring constant)(x- distance compressed or stretched)
Define Work on an object
Work on an object is done when a force causes a displacement on the object
When the force of an object is applied in the same direction as the displacement, the work is positive or negative?
positive
What are some of the formulas to find Power
P=W/T, P=FD/T, P=FV, P=MAD/T
At which point is the kinetic energy the greatest, A, B, or C?
C
Define Potential Energy
Energy associated with an object because of it's position, shape, or condition
True or False: Work is done when the object is moved in the same direction the force is applied in
True
When the force of an object is applied in the opposite direction as the displacement, the work is positive or negative?
negative
Nicki Minaj's dog weighs 266 N. If her dog is able to climb up the stairs with the height of 10 m in 8 seconds, what is the amount of power used?
332.5 Watts
A 7 kg ball rolls at a rate of 14 m/s. What's the balls kinetic energy?
686 J
A ball, with a mass of 7.98 kg, is lifted raised 10 m off the ground. What is the gravitational potential energy associated with the ball at the height relative to the ground?
782.04 Joules
Julieta lifts a box to her room upstairs in 15 seconds. Michelle lifts the same box upstairs into Julietas room but in 20 seconds. Who did more work?
Both did the same amount of work
True or False: Work is equal to a change in kinetic energy
True
Julieta pushes a train and exerts a force of 2,897 N at a speed of 4 m/s for 6 min. How much power was delivered from Julieta?
11,588 W
What is the kinetic energy of a 125 kg object moving at a speed of 25 m/s?
39,062.5 J
A 3.5 kg mass is attached to a vertical spring. The spring is stretched 0.35 m. What is the elastic potential energy of the spring if the spring constant is 60 N/m?
3.67 Joules