Unbalanced/
Balanced Forces
Balanced Forces
When two equal forces act in opposite directions the result is
Balanced force
A push or a pull that can cause the motion of an object to change.
Force
The process of moving or changing position.
Motion
Which part of your bicycle helps give friction between it and the road, so it does not just slide on the pavement?
the tires
Sierra goes outside to push her little sister on the swing. She knows when to push on the seat of the swing because she can observe __________.
the pattern of how long it takes for the swing to go forward and then back again
When one force is stronger than the other the result is
Unbalanced force
A force that attracts objects toward the earth. "What goes up, must come down!"
Gravity
If you drop a ball is it at rest or in motion?
The ball is in motion. The forces acting on the ball are unbalanced (Gravity is pulling it down).
Friction happens when
two or more objects move against each other.
Is a turtle sitting on a log a description of a pattern of motion? Why or why not?
No, there is no movement (motion) so there can be no pattern.
Is a student sitting in a chair an example of balanced or unbalanced forces?
Balanced forces. Gravity is pulling the student down and the chair is pushing the student up with equal force, resulting in no motion.
_______ is the force that acts to slow an object down.
Friction
Explain the relationship between string length and motion for pendulums.
The longer the string length, the slower a pendulum swings. The shorter the string length, the faster a pendulum swings.
Why does a figure skater put on a pair of ice-skates with blades on the bottom instead of a pair of tennis shoes in order to skate on the ice?
to reduce friction between her foot and the ice
Is the Earth traveling around the sun a description of a fast or slow pattern of motion?
Slow-365 days to complete one cycle of the pattern
Balanced forces are _____ in size but opposite in direction.
equal
_______ is the amount of force that is applied to an object.
Strength
What are some examples of very fast motions? What about extremely slow motions?
Fast motion could include the flapping of a bee's wings, a cheetah running, an airplane flying or a speaker vibrating. Some really slow motions could be a plant growing, a glacier sliding or a snail moving. No matter how slow motion is, it's still motion!
True or False: Friction can cause heat.
True
When the same motion repeats itself over and over, it creates a ___________.
pattern
How do balanced and unbalanced forces cause the egg to drop into the water?
When the egg is sitting on top of the toilet paper tube, the forces acting upon it are balanced. The tube is pushing it up and gravity is pulling it down. When the tube is quickly removed, the only force acting on the egg is gravity, which causes its motion downward into the cup of water.
Force has two important properties:
strength and direction
Who created these laws of motion:
Sir Isaac Newton
A student pushes a book across a tile floor and then he pushes the same book across a carpeted floor. The book slides more easily across the tile than on the carpet, why?
The book experiences less friction on the tile.
In order for a pattern of motion to occur, an object's _________ must be constantly changing.
position