Which makes work easier a single or double pulley system
Double pulley system
100
What is friction?
Friction is the force that resists movement between two objects.
100
During energy transformation what energy is commonly produced
Heat
200
Name Three Fossil fuels
Oil, Coal, and Natural Gas
200
Energy is the ability to do
work
200
A ramp is an example of what type of simple machine
Incline plane
200
Which surface will produce the least amount of friction?
fuzzy soccer field
gravel running track
smooth glass tabletop
grassy soccer field
smooth glass tabletop
200
Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill?
(a) Kinetic energy decreases and potential energy increases.
(b) Kinetic energy increases and potential energy decreases.
(c) Both potential energy and kinetic energy decrease.
(d) Both potential energy and kinetic energy increase.
Kinetic energy increases and potential energy decreases.
300
Name three renewable resources
Wind, Hydroelectric, geothermal, solar,
300
A car or truck moving down hill has what kind of energy
Kinetic
300
Which is not an example of a simple machine?
screw
pulley
fulcrum
inclined plane
Fulcrum
300
Which of the following does not involve any friction?
A bicycle rolling down a hill
A baseball player sliding into 2nd base
A diver falling through the air to a pool
All of the above experience some friction.
All of the above experience some friction.
300
What is the name of the device that will convert mechanical energy into electric energy
Generator
400
What are two disadvantages of Fossil fuels?
air pollution, respiratory illness, and
400
The sun gives off energy in the form of light and heat this is called
Solar energy
400
What is the name of the force that can move a load?
Applied force, input force, effort
400
Gravity and friction are examples of
Forces
400
Identify two type of energy produced by a hair dryer
Mechanical energy, Heat energy, Wind energy
500
Why is water considered a renewable resource?
Because it can be recycled easy over time.
500
An example of potential energy is:
A basketball sitting on the rack.
A bird flying.
Water boiling.
Grandma rocking in her chair.
None of the above.
A basketball sitting on the rack.
500
The ratio of output force to input force is known as…
mechanical advantage
500
How do you reduce friction?
Use a lubricant, oil or grease
500
What kind of energy conversion takes place when a toaster is switched on?