Science 3 Flashcards
(17 cards)
A ramp, staircase, and ladder are
inclined planes
A jar lid and corkscrew are:
screws
What simple machine is used to hoist a flag or raise window blinds?
Pulley
A wheelbarrow, scissors, and a bicycle are:
compound machines
Simple machines with fulcrums (pivot points) are usually:
levers
These simple machines have ropes or chains.
pulleys
A wheelbarrow is a compound machine with a _______ and _________.
lever (the handles); and wheel and axle
A pair of scissors has:
a lever and wedges
Two objects rubbing together create:
Friction
Friction resists or stops motion, and creates:
heat
Unless acted on by a force, objects in motion tend to stay in motion and objects at rest remain at rest. This is the principal of:
inertia
It’s harder to push a real truck than a toy truck because objects with more mass have:
more inertia
Which will light a bulb, an open or closed circuit?
A closed circuit
If your string of holiday lights goes dark when one little bulb burns out, the string of lights is a;
series circuit
This circuit has more than one pathway for the flow of electrical current. If one bulb burns the others will remain lit, It is a:
Parallel circuit
Electrical energy moves easily through materials that are:
conductors
Wires are usually made from ______ because it conducts electricity well.
metal (often copper)
