Work
What is happening in a negative work situation?
The force is being applied in the opposite direction of the movement.
The imperial system unit for power is the _______.
horsepower
Joule
A method to express the multiplying effect that a machine can produce is known as _____.
mechanical advantage
A pulley system with 4 ropes, not counting the rope you pull, has a mechanical advantage of _____.
4
What is the equation to calculate work?
Work = Force(displacement)
Velocity
The equation for calculating gravitational potential energy is ______.
PE = mgh
This simple machine is comprised of an incline plane wrapped around a center point.
Screw
A pair of scissors has multiple simple machines incorporated in its design. It is known as a ______ machine.
compound
True or False: Walking across the room while holding your backpack is doing work on the backpack.
Watt
A 10 kg boulder at the top of a 10 meter high cliff has the potential energy of ______ joules.
980
The pivot point of a lever is known as the ______.
fulcrum
A lever with a mechanical advantage of 4 pulls on a 3-pulley system. What is the total mechanical advantage of the machine?
12
What is the unit work is measured in?
Joules
The power of a motor that can deliver 1,000 joules of work in 500 seconds is ______.
2 watts
KE = 0.5mv2
To calculate the mechanical advantage of a ramp dive the length of the ramp by the _______.
height of the ramp
True or False: You push on an object with a force of 75 newtons for 10 seconds, yet the object does not move. You did NO work.
True
What is the displacement of an object with a weight of 10 kilograms that requires 98 joules of work to push it 1 meter across the floor?
1 meter
Power can be calculated by taking Work/______.
Time
According to the work-kinetic energy theorem, work is equal to the change in _______.
kinetic energy
A first class lever has an effort arm length of 4 meters and a load arm length of 2 meters. What is its mechanical advantage?
2
746 watts = 1 __________
horsepower