| Question | answer |
| a push or a pull that causes an object to move, stop or chagne direction | force |
| force that pulls all objects in the universe toward each other | gravitation |
| forces going in the oppoite direction and one force is greater than the other | unbalanced force |
| forces equal in size and opposite in direction | balanced force |
| force that goes against motion when two surfaces rub together | friction |
| force of pushing or pulling between magnetic poles | magnetism |
| What are the three main forces we studied? | gravitation, friction, magnetism |
| special type of gravitation that pulls things towards the earth. | gravity |
| Will two north ends of a magnet attract or repel? | repel |
| Will two south ends of a magnet attract or repel? | repel |
| Will a north and south ends of a magnet attract or repel? | attract |
| Forces always act in ________. | pairs |
| Is the gravitational force bigger or smaller when objects are farther apart | smaller |
| If an object is extremely large, like the sun, it the gravitational force bigger or smaller? | bigger |
| T/F? Gravity pulls people to the earth and earth towards the people | True |
| If a moving object stops, then the forces must be ___________ | unbalanced |
| If a moving object keeps moving at the same speed and same direction, the forces must be | balanced |
| If a stopped object starts moving, the forces must be | unbalanced |
| If an object isn't moving, the forces must be | balanced |
| What is the net force of a tug of war game if one side pulls with 50 newton and the other side pulls with 20 newton? | 30 newtons |
| force that causes a material to twist | torsion |
| stretching force that pulls on a material | tension |
| pressing force that squeezes a material together | compression |
| the permanent parts of structure that cannot be removed | dead load |
| the movable and removable parts of a structure | live load |
| Is a penny an example of a live or dead load | live load |
| Is a floor an example of a live or dead load | dead load |
| Is a ceiling fan an example of a live or dead load | dead load |
| Is a person an example of a live or dead load | live load |
| Wind, rain, earthquakes, and sunshine are all examples of what kind of special load | environmental live load |
| What type of bridges use strong cables to help support the dead and live loads of the bridge | suspension bridges |
| type of force that occurs when two objects touch | direct force |
| type of force that occurs even though the objects do not touch | indirect force |
| Is magnetism a direct or indirect force | both |
| Is gravitation a direct or indirect force | indirect |
| Is friction a direct or indirect force | direct |
| If all the atoms are lined up in a substance, then that substance is probably a | magnet |
| Will a magnet lose its magnetic force if it is drop very very hard? | yes |
| What two things affect gravitation? | mass and distance |
| Will a magnet lose its magnetic force if it is broken in half? | no |