Light, Sound and Motion
This topic focuses on the forces that affect motion. This includes the relationship between the change in speed of an object, the amount of force applied and the mass of the object.
Light and sound are explored as forms of energy that move in predictable ways, depending on the matter through which they move.
Content Statement:
* The amount of change in movement of an object is based on the mass of the object and the amount of force exerted.
* Movement can be measured by speed. The speed of an object is calculated by determining the distance (d) traveled in a period of time (t).
* Earth pulls down on all objects with a gravitational force. Weight is a measure of the gravitational force between an object and the Earth.
* Any change in speed or direction of an object requires a force and is affected by the mass of the object and the amount of force applied.
Grade 5 Concepts:
The motion of an object can change by speeding up, slowing down or changing direction. Forces cause
changes in motion. If a force is applied in the same direction of an object’s motion, the speed will
increase. If a force is applied in the opposite direction of an object’s motion, the speed will decrease.
Generally, the greater the force acting on an object, the greater the change in motion. Generally, the more mass* an object has, the less influence a given force will have on its motion. If no forces act on an object, the object does not change its motion and moves at constant speed in a given direction. If an object is not moving and no force acts on it, the object will remain at rest.
Movement is measured by speed (how fast or slow the movement is). Speed is measured by time and
Content Statement:
* Light and sound are forms of energy that behave in predictable ways.
* Light travels and maintains its direction until it interacts with an object or moves from one medium to
another and then it can be reflected, refracted or absorbed.
* Sound is produced by vibrating objects and requires a medium through which to travel. The rate of vibration is related to the pitch of the sound.
Grade 5 Concepts:
Light can travel through some materials, such as glass or water. Light also can travel through empty
space, like from the sun to Earth. When light travels from one location to another, it goes in a straight line
|
|
