Science 7 Midterm:
Scientific Method:
1. Ask a question.
2. Research.
3. Make a hypothesis.
4. Perform an experiment.
5. Make observations.
6. Write down the results.
7. Make a conclusion.
Lab Safety:

Wait for teacher to give directions.

Inform teacher of any issues.
Energy- the ability to do work
Potential energy- stored energy
Kinetic energy- energy being used
Gravity- gravitational force
Force- push or pull on an object
Speed- distance covered in a certain amount of time
Acceleration- change of speed
Friction- objects rubbing against each other or on a surface
Matter- takes up mass and space (atoms)
Atoms- smallest unit of matter and are made of electrons, protons and neurons
Electricity- form of energy from charged particles
Motion- process of moving or changing position
3 Stages of Matter:

solid- particles packed tightly

liquid- particles close together

gas- particles spread far apart
Simple Machines (makes work easier):

inclined plane

pulley

lever

wheel and axle

screw

wedge
Complex machine are made up with 2 or more simple machines.
Class 1, 2, 3 Levers:
Class 1 (example- scissors)
Class 2 (example- wheelbarrow)
Class 3 (example- stapler)
Energy Forms:

electrical

sound

light

mechanical

renewable energy

nonrenewable energy
Formulas:

Speed

1 cm = 10 mm
s=d÷t