We are wrapping up our unit on Energy and Electricity. As a whole they ROCKED the test.
Tuesday we will finish up the few stray tests that need to be taken have a few more hands on experiences to enrich their understanding of this topic.
Wednesday starts our next unit on Force and Motion. The vocabulary words for this unit are below. There is not going to be a vocabulary quiz this week since they are just getting these words. The first vocabulary quiz will be next Friday February 17th.
Vocabulary _ Force and Motion
- Force—A push or a pull that one object exerts on another object with or without direct contact (e.g., friction, gravity). Causes a change in speed or direction.
- Push or Pull:
- Balanced forces—forces that are equal in size but opposite in direction.
- Unbalanced forces—forces that are unequal in size and may or may not be opposite in direction.
- Types of Force:
- Buoyant force -the upward force exerted on an object by water.
- Gravitational force - the pull of all objects in the universe on one another.
- Magnetic force - the force produced by a magnet.
- Friction—a force that opposes motion through direct contact
- Measurement of Force
- Net force - the combination of all the forces acting on an object.
- Newton – (N) the unit of measuring force
- Weight—a measure of the force of gravity on an object.
- Work - the use of a force to move an object through a distance
- Simple Machine - a device that makes a task easier by changing the size or direction of a force or the distance over which the force acts.
- Types of Simple Machines:
- lever - a bar that makes it easier to move things.
- fulcrum - the balance point on a lever that supports the arm but does not move.
- resistance – the
b. inclined plane - a ramp or another sloping surface.
- wedge
- screw
c. pulley - a wheel with a rope that lets you change the direction in which you move
an object.
1) wheel and axle - a wheel with a rod, or axle, in the center.
- Compound Machine – combination of two or more simple machines that makes a task easier by changing the size or direction of a force.
- Motion – the change in position of an object over time with respect to a reference point.
- Position - the location of an object in space.
- Acceleration – the rate at which velocity changes
- Speed—the distance traveled by an object in a given amount of time. Measured in distance per time, such as miles per hour (mph)
- Inertia - the property of matter that keeps it at rest or moving in a straight line.
- Velocity – the speed of a object in a particular direction
