In this picture, the bowling ball is _____, while the pins are ______. When the bowling ball hits the pins, the pins will be ________.
In Motion
Still
In Motion
Why do scientists classify forces?
To make them easier to study
One time we see the effects of Gravity is during the Water Cycle. Give an example.
Gravity pulls rain back to Earth's surface.
Gravity pulls groundwater deep into the soil.
Only _____ objects can be affected by magnets. For example, ______ can be affected by magnets, but _____ cannot.
Metal
- Aluminum cans, screws, nails, staples, compasses
- Candy, clothes, erasers, pencil lead,
Objects can become _______ charged when they gain or lose _______.
Temporarily charged
Electrons
All objects are made of matter.
All matter is made of atoms.
So, _____.
All objects are made of atoms.
The man is _____ the rock so it moves _______, but _____ the rope so it moves _______.
Pushing; Away from Him
Pulling; Towards him
Scientists classify forces into ______ or _______ based on _________.
Contact
Non-contact
Whether they require the objects to touch
When we jump, we pull back on the Earth.
Why doesn't the Earth move to meet us?
The Earth's mass is too high (or our force is too weak).
These two magnets will ______ because _________.
Repel because their poles are matching
The hair is _______ to the balloon because ______.
Attracted
The hair is positive while the balloon is negative
How can scientists see atoms? _________
In the classroom, we can't see atoms, so we have to make _____ to learn about their properties.
By using the world's strongest microscopes
Inferences
The tall boy exerts a stronger force because _____.
The tall boy exerts a stronger force so ______.
- He is bigger/stronger/has more mass.
- The ball will move faster/farther.
One example of a contact force is _______, but one example of a non-contact force is _______.
- Pushing a box, picking up an object, tug-of-war, pulling a sled, etc.
- Gravity, magnetism, electric forces
If we travel to Mars, our ____ will stay the same, but our ____ will change.
Mass
Weight
The Ancient _____ invented the ______ to help humans _______ using Earth's magnetic field. Birds don't need this tool because _______.
Chinese
Compass
Navigate
They can see the magnetic field.
What is happening here?
The sock and sweater rubbed together in the dryer. Electrons were transferred from the sweater to the sock, making one positive and one negative. Now, the temporarily charged clothes attract each other.
Name the particles in the picture and describe their charge.
Blue - Electrons - Negative
Green - Neutrons - No Charge
You throw these balls with an equal force.
The _____ will move farther because _________.
The basketball will move farther because it has less mass.
Magnetism, Electric Forces, and Gravity are all examples of ________ forces because _________.
They can create a ________, which only affects objects that are ______ of it.
Non-contact forces because they act across a distance.
Field, Inside
Two factors that affect Gravity's pull are ___ and ____.
Gravity increases when ______, but decreases when ____.
Mass and Distance
Objects are close and heavy
Objects are far and light
Earth has a magnetic field because _________.
Earth has a magnetic field so ________.
Because the liquid metal in the Outer Core is moving.
So, compasses can be used to help humans navigate.
Static shock and lightning are similar because _______.
Static shock and lightning are different because ______.
Similar - both involve the quick transfer of electrons; both can be painful
Different - Lightning is much more powerful; Static shock happens over a much smaller distance
When they gain or lose an ________, they become a charged particle called an ________.
Neutral
Protons and Electrons
Electrons
Ion
A train and a bike are about to collide.
Which one will be easier to turn?
The bike will be easier to turn because it has less mass.
In this picture, Star Wars' Yoda uses "the force" to close a door far away. This is an example of a _____ force because ________.
In real life, to close a door, the force we use to close a door is _______ because _________.
Non-contact force because he doesn't need to touch it.
In real life, we use a contact force because we need to touch the door in order to close it.
Jupiter has more gravity than Earth because ____.
Jupiter has more gravity on Earth so ____.
It has a larger mass.
Our weight will be higher there. (Or, we won't be able to jump as high...)
One similarity between magnetism and gravity is ______.
One difference between magnetism and gravity is _____.
Similarities - Both non-contact, both act across a distance, both stronger when objects are close together, both create a field
Differences - Magnetism only works on metal objects but gravity works on all objects; Magnetism can attract or repel but gravity can only attract; Birds can see the magnetic field but cannot see the gravitational field.
One similarity between electric forces and magnetism is _______.
One difference between electric forces and magnetism is ______.
Differences - Electric based on charge but magnetism on poles; electric charge is temporary but magnetism is permanent; Any object can become charged, but only metal objects can be affected by magnets.
This ion has a ________ charge because _______.
Negative
It has more electrons than protons