#### Transcript jeopardy_Final2 - Decker

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Phys. Sci.
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Speed is the ratio of the distance
an object moves to…
the amount of time needed to
travel the distance
Suppose you increase your
walking speed from 2 m/s to 8
m/s in a period of 2 seconds.
3 m/s2
Two or more velocities add by…
A person in an airplane is at rest
relative to what?
Anything inside the airplane
(seat, neighbor…)
You drive 1000 m in 60 sec and then
remain at rest for 40 sec. What is
10 m/s
The SI unit for force is…
the Newton
Projectile motion is caused by…
forward motion and the
downward force of gravity
What is conserved when 2 objects
collide in a closed system?
momentum
The centripetal force acting on
the moon continuously changes
its…
direction
Name the 4 universal forces.
Electromagnetic
Gravitational
Weak & Strong Nuclear
A hydraulic lift (like on a dump
truck) is an example of whose
principle?
Pascal’s Principle
Where would you experience
greater fluid pressure?
at the bottom of a lake
that is 10 m deep
or
10 m down into the ocean
The pressure would be the same
in both places.
A boulder weighs 2000 N. When
submerged in water, it weighs
1450 N. What is the buoyant
force exerted by the water on the
boulder?
550 N
Define lift.
Upward (or downward) force due
to pressure differences.
Example: airplane wing
Name something that is a fluid
and something that is not.
Example:
Hydrogen = fluid
Wood = not fluid
The efficiency of a machine is
always less than 100% because…
FRICTION!
What ways can a machine make
work easier for you?
Change the direction of a force
Change the distance over which
the force must be applied
Change the size of the force
The SI unit for power is the…
Watt
The distance over which YOU
exert a force on a machine is
called…
Input distance
You lift a 160 N box 1 m in half a
second. What power did you
produce?
Power = work/time
Power = (force*distance)/time
Power = (160N*1m)/.5 sec
Power = 320N*m/sec
Power = 320J/sec
Describe a vector.
Represented by an arrow.
Shows magnitude (size) and
direction.
5m
NE
If a machine reduces the force it
takes to do a task, what will happen
to the distance over which you’ll
have to exert that force?
The distance will be large
Do you have buoyant force
acting on you right now?
Yes, the air around us is a fluid
and we are “submerged” in it.
How is the pressure by a fluid
exerted at any given depth?
Equally in all directions
What is a compound machine?
A machine that is made of
up two or more simple
machines.
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