factor by which a machine multiplies the effort force
ma
What is mechanical advantage
100
a form of energy resulting from the motion of particles in matter.
What is heat
100
A measure of how fast an object's particles are moving is
heat
temperature
What is temperature
100
A hammer is a lever.
true/false
What is true.
100
The mechanical advantage of a wheel and axle depends on the size of the wheel compared to the thickness of the axle.
true/false
What is
true
200
Machines can change heat energy into useful mechanical energy.
true/false
What is true.
200
The flow of energy that occurs when a warm liquid or gas rises is
convection
conduction
What is convection
200
A screw contains:
axle
wheel
lever
inclined plane
What is an inclined plane.
200
The Fahrenheit temperature scale was introduced in
15 BC
624 AD
1724 AD
What is 1724 AD
300
another name/makes a stationary inclined plane
ramp
level
wedge
What is a ramp
p.125
300
Nuclear fusion and nuclear fission are the same.
true /false
What is false.
Fusion......atoms joined and energy is released
Fission.......atoms split and energy is released
300
The first steam engine was used as a
cooking utensil
medical instrument
toy
What is a toy
p.136
300
a newton- meter is also called a
What is a joule
300
Nylon is manmade.
true/false
What is true.
400
A pulley is a wheel with a rope, chain, or belt around it. It must be attached to a wall to work correctly.
t/f
What is false.
p.123
400
As the temperature of an object increases, the amount of heat in the object
increases
decreases
makes the mass increase
What is increases
400
Work =
force + distance
force X distance
What is work X distance
400
Helium is one of the most common elements in the universe.
Helium is very rare on earth.
true/false
What is true.
p.61
500
A single fixed pulley changes the direction of the force you apply and it multiplies that force.
true/false
What is false.
It does not multiply the force.
p. 123
500
When frozen water melts and then evaporates,
heat energy has caused the water molecules to:
A.move closer together both B and C
B. move faster
C. move farther apart
What is both B and C
Review p. 156
500
A machine is something that has been manufactured.
true/false