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# Brandt Sci 12

### Chapter 12 part 1

Force Push or pull makes object start moving or stop moving, speed up or slow down or change direction
Friction Force between surfaces that slows objects down or stops them from moving
Speed Distance object moves in a certain time
Inertia The tendency of an object to remain in motion or to stay at rest unless acted upon by an outside force
Work Use of a force to move an object a certain distance
Energy Ability to do work, either to make an object move or to change matter
Simple Machine Machine with few moving parts, making it easier to do work
Effort Force Amount of force needed to move something
Load Object being lifted or moved by a machine
What is the difference between a simple machine and a machine? A simple machine has few parts.
What are the two parts of a lever? fulcrum and bar
When a pulley wheel is attached to something it is a _______________? Fixed Pulley
Which simple machine has a bar that passes through the center of the wheel? Wheel and Axle
Which simple machine has two inclined planes back to back? Wedge
What simple machine has a wheel and string to lift things easier? Pulley
What machine has wheels and teeth? Gears
What does more pulleys do for you? Makes it easier
What do two or more simple machines together make? Compound Machine
What simple machine is an incline plane twisted? Screw
What two simple machines make a pair of scissors? Lever and Wedge
What is the measure of how much useful work a machine puts out compared to work put in called? Efficiency
When gears move on a machine energy is a lost to what? Friction
Forces make objects____________? Slow down or change directions
Friction makes objects _________ down? Slow down or stop
Energy that is moving(like throwing a ball) is ___________energy Kinetic
Energy that is not moving or stored (like a pencil sitting on your desk) is __________ energy. Potential
What kind of energy do we get from our food? Chemical Energy
What kind of energy do we get from falling water or wind? Mechanical Energy
What kind of energy do we get from the sun? Light Energy
What kind of energy do we get from a stove or fire? Thermal Energy
A ramp is what kind of simple machine? Inclined Plane
Your teeth are what kind of simple machine? Wedge
A flagpole has what kind of simple machine attached to it? Pulley
A turn jack is what kind of simple machine? Screw
A round doorknob is what kind of simple machine? Wheel and Axle
A teeter totter is what kind of simple machine? Lever
What simple machine do you use playing baseball? Lever
What simple machine is a window blind? Pulley
What force pulls items to the ground? Gravity
If you are loading heavy boxes onto a truck what simple machine might help you? Inclined Plane
Created by: kristib2pea