The ___________________________________ of a machine is the number of times that the machine increases the input force.
Mechanical Advantage
100
Walking converts what type of energy into mechanical energy?
Chemical
200
Little John exerts 1000 Newtons of force on a boulder that does not move. Calculate the amount of work that Little John performed.
0 Joules.
200
How many watts equal 1 horsepower
746.55 watts
200
A(An) ____________________ can be described as an inclined plane wrapped around a cylinder.
Screw
200
An inclined plane reduces the effort force by ...
Increasing the effort distance.
200
The total potential and kinetic energy of all the microscopic particles in an object make up its
thermal energy
300
What is the equation used to calculate work?
Work = Force x Distance
300
What is the definition of power?
rate of work.
300
The fulcrum is always between the effort force and the resistance force in a(an) ____________________-class lever.
First
300
What will reducing friction in a machine do
Increase the efficiency
300
Nuclear power plants are designed to convert nuclear energy into what type of energy?
electrical
400
If you exert a force of 20.0 N to lift a box a distance of 0.75 m, how much work do you do?
15 Joules.
400
If you exert a force of 1000N to walk 7 m up a flight of stairs in 4 s, how much power do you use?
1750 watts
400
Even the best machine cannot increase the amount of _________ done.
work
400
A 100-m long ski lift carries skiers from a station at the foot of a slope to a second station 40 m above. What is the IMA of the lift?
2.5
400
What type of energy increases when an object becomes warmer?
thermal energy
500
If you perform 60 joules of work lifting a 30-N box from the floor to a shelf, how high is the shelf?
2 meters
500
To increase power, you can increase the amount of _________ you do in a given amount of time, or you can do a given amount of work in less ________.
Work, Time
500
Why do all machines have an efficiency below 100%
friction
500
If you have to apply 30 N of force on a crowbar to lift an rock that weights 330 N, what is the actual mechanical advantage of the crowbar?
11
500
A 3-kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat’s gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8 m/s2?