Output force to input force is known as?
a. fulcrum
b. mechanical advantage
c. power
d. efficiency
What is b. mechanical advantage
100
The energy an object has because of its location is known as _________________ energy.
a. kinetic
b. thermal
c. potential
d. mechanical
What is c. potential
100
What is power measured using?
a. joule
b. watt
c. newton
d. meters
What is b. watt
100
How much work is done on a box with a force of 50 N is pushed 5 m?
What is 250 Joules (work in joules=force times distance)
100
What is a simple machine you can use to lift a heavy object across a distance, in which you may not be able to physically lift?
What is inclined plane
200
Useful output work to total work input is called?
a. fulcrum
b. mechanical advantage
c. power
d. efficiency
What is d. efficiency
200
This energy of an object is equal to one half the product of its mass times its speed squared (this is the formula).
a. kinetic
b. potential
c. thermal
d. mechanical
What is a. kinetic
200
What is the formula for power?
What is work done on an object divided by the time taken to do the work.
200
What is the efficiency of a machine that puts out 200 watts of power for every 2000 watts put into it?
What is 10% (energy output divided by energy input and times 100%).
200
What is the biological process called that uses combustion to release energy from molecules so cells can do work?
a. metabolism
b. photosynthesis
c. respiration
d. potential energy
What is a. metabolism
300
Force times distance is defined as?
a. work
b. energy
c. mechanical advantage
d. density
What is a. work
300
T/F: Energy changes from one form to another with no lose or gain.
What is True
300
How much power will it take to do 30 J of work in 5 seconds?
What is 6 Watts (work divided by time=power in watts)
300
What is the efficiency when a jack has 500 theoretical mechanical advantage, but the actual mechanical advantage is only 250?
What is 1/2 (actual divided by theoretical)
300
T/F: Work is done on an object when you carry it horizontally?
What is false
400
Work is measured in?
a. newton
b. joule
c. watt
d. power
What is b. joule
400
T/F: To have kinetic energy in an object it must be moving.
What is True; although an object at rest may have energy, just not kinetic energy.
400
If you lift up an object, creating potential energy, the elevation of the object is equal to the __________ done in lifting it.
a. work
b. power
c. efficiency
d. mechanical advantage
What is a. work
400
T/F: If an arrow is fired with 50 J of potential energy, with no loss of heat, the kinetic energy will decrease.
What is False-the kinetic energy will remain the same/equal to the potential energy and have 50 J.
400
Provide some examples of a simple machine.
What is pulley, inclined plane, lever, jack, wedge.
500
A pulley system can change ____________ of a force and ___________ the amount of work done.
a. direction/decrease
b. direction/increase
c. power/increase
d. power/decrease
What is b. direction/increase
500
Which has more kinetic energy: A truck 200 pound traveling at 25 km/h, or a 100 pound truck traveling at 50 km/h?
What is the 100 pound truck at 50 km/h.
500
T/F: In a simple machine, work input is more than work output.
What is False; work input is equal to work output.
500
What percent efficient is a gasoline burning engine on a car?
What is 30%
500
Define what a simple machine is?
What is a simple device for changing the direction of forces.