Forces (3)
What is a force?
A force is a push or a pull. A force can make an object start moving or stop moving.
What are the 5 forces?
Muscular, friction, gravity, magnetic, static
Anything that has ___________ has gravity.
mass (weight)
What is natural light?
Light that is produced by things in nature, such as the Sun.
When light bounces off the surface of a material. What is it called?
- Reflection, absorption, refraction
Reflection
A force that moves an object away from something.
Push
Which force is the force created through the use of your muscles.
Muscular force
If there is a lot of friction between two objects, energy is lost to the surroundings as _______.
heat
What is artificial light?
light from things made by humans, usually powered by electricity or gas.
When light passes through an object and bends.
- absorption, refraction, reflection
Refraction
A force that brings an object closer.
pull
Which force is the force that acts on objects that rub against each other.
Friction
A dark area made by an object that is between a ray of light and a surface.
Shadow
Too much artificial light is called...
light pollution
Materials allow light to pass through. Clear glass
Transparent
When forces are balanced...
There is no movement. That means that two forces are pushing against each other or pulling away from each other with the same strength.
Which force is the force that pulls objects toward each other.
Gravity
Do these things reflect, refract or absorb light?
Wood table, cotton t-shirt
Absorb
Light travels in straight paths called...
light waves
Materials allow some of the light to pass through. Tissue paper and sunglasses are examples
Transluscent
When forces are unbalanced...
There is movement. One force is stronger than the other
Which force is the force of a magnet attracting
objects made of iron, nickel, cobalt, and steel.
Magnetic
Does this reflect, refract or absorb light?
Water in a cup
Refract
When light stops at the object and does not reflect or refract, what is it called?
-Reflection, absorption, refraction
Absorption
Materials do not allow any light to pass through. Examples include wood, a metal spoon, and a cardboard box.
Opaque