A force is a push or pull upon an object resulting in an interaction between the two objects. When there is an interaction, there is a force. Thus forces only exist when there is an interaction.
Objects have mass. A force of a push or pull will cause it to change velocity.
Video on Push and Pull
Sometimes objects don’t change direction or move. This is due to forces that are of equal size in opposite direction. This force is balanced and would not cause a movement. It is an unbalanced force that causes an object to move or change direction.
Object on water experience a force that pushes an object up and makes it seem to lose weight in the fluid. Upthrust is also called buoyancy and it explains a boat floating on water or a swimmer moving in the water. Upthrust also occurs in air. A helium balloon floating in the air also experience the upthrust force.
Use of Forces
Forces can be used to twist or turn objects.
Objects will spin quicker if the force is greater.
Synonyms for twist/turns, push and pull. Make a list of words that are the synonym for twists/turns, push and pull. Compare your answers. Click on the link below.
Make a list of things you can twists/turn. What happens to the objects that you can twist and turn.
Push and Pull. Look around your house and find items that would do a push and pull motion. Then sort the items according to push and pull. For example you may find elastic, puzzles, etc.