Energy
This is the ability to do work.
Energy
This is the unit for measuring force.
Newton
This is the unit for measuring power.
Watt
What is the acceleration of gravity (in number form)?
9.8 m/sec2
This is the unit for measuring work.
Joule
What type of energy do plants provide for themselves and consumers?
Chemical
Name three renewable resources.
Wind energy
Water energy
Solar Energy
How does friction make a machine inefficient?
It converts some of the kinetic energy into heat.
If a boy climbs up a vertical ladder 7m high with 450 N of force, how much work did he do?
3150 J or 3.2 kJ
The amount of work done or energy provided in a period of time.
Power
This energy type is the amount of kinetic energy in the particles of an object.
Thermal Energy
What non-renewable resource does electricity in our area come from?
Natural Gas
The force needed to do the same work with a machine.
Effort Force
How much work is done when lifting a 5kg bucket 3m high? You may need to figure out force first.
147 J
The unit for measuring force.
Newton
Name at least two kinds of energy used in a DVD player.
Electric
Sound
Kinetic
Thermal
Waterfalls and dams convert this specific type of potential energy into kinetic energy as the water falls.
Gravitational Potential Energy
The amount of force needed to do work without a machine.
Resistance Force
Calculate the mechanical advantage when the effort force is 60 N and the resistance force is 180 N.
MA = 3
If the mechanical advantage is 4, what does the number 4 represent?
The machine magnifies the effort of force 4x.
The measure of the energy transferred when a force is applied to an object that causes it to move, and at least part of that force is in the direction of movement.
Work
This is the total of all potential and kinetic energy within a system or body.
Mechanical Energy
It changes the direction of the force.
We have a machine with 70% efficiency and an ideal mechanical advantage of 3. What is the actual mechanical advantage?
2.1
_______ is the amount of useful work done to make a machine operate while ________ is the amount of actual work done by the machine.
Work input; Work output