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What is the scientific definition of work?

What formula is used to find average speed?

Final exam

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Answers

1
What formula is used to find average speed?
speed × time = distance
time ÷ distance = speed
distance × time = speed
distance ÷ time = speed
2
What is the scientific definition of work?
Any activity that requires effort
A force applied in any direction
Energy used to complete a task
A force applied in the same direction as motion
3
What causes a phase change in matter?
Change in weight
a. Change in particle size
Change in color
Change in energy
4
What is a compound?
A mixture of elements
A physical mixture
Two or more elements chemically combined
A pure element
5
What is physical science primarily the study of?
b. Matter and energy
a. Matter and motion only
c. Chemistry and biology
d. Energy and forces only
6
What is the SI unit for speed?
feet per minute
kilometers per hour
meters per second
miles per hour
7
What are the two main branches of physical science?
c. Astronomy and physics
d. Geology and chemistry
b. Physics and chemistry
a. Biology and chemistry
8
What type of energy is converted into kinetic energy as a roller coaster descends?
nuclear
Chemical
Potential
Thermal
9
What is a simple machine that helps lift objects with less force?
Pulley
Lever
screw
wedge
10
According to Newton’s First Law, an object will:
Move faster when more force is applied
Always slow down eventually
Remain in motion or at rest unless acted upon
Change direction randomly