Net Force
Bob is pushing a heavy couch to another part of the living room. Bob is pushing with a force of 10 N while the couch is pushing against Bob with a force of 8 N. What is the total net force due to Bob’s pushing? Are forces balanced or unbalanced? What will happen to the motion of the heavy couch?
10 N - 8 N = 2 N, forces are unbalanced, so the couch will move in the same direction that Bob is pushing it.
This makes your hands warmer as you rub them together.
What is FRICTION?
a force of attraction between two masses
What is GRAVITY?
The SI unit of force
What is NEWTON?
The ability to return to its original shape after being stretched or compressed.
What is ELASTICTY?
Bob and Dan are pushing the couch together, Bob with a force of 6 N and Dan with a force of 5 N. The couch exerts a force of 8 N in the opposite direction (of Bob and Dan). What is the net force? Are forces balanced or unbalanced? What will happen to the motion of the couch?
To find total force of Bob and Dan, you add (6 N + 5 N = 11 N). Then you subtract, 11 N – 8 N = 3N (since the couch pushes in the opposite direction), forces are unbalanced, it will move in the direction that Bob and Dan are pushing.
A force that opposes motion between two surfaces that are touching.
What is FRICTION?
The SI Unit for weight
What is NEWTON?
The sum of all forces acting on an object.
What is NET FORCE?
The force that causes material to spring back to its original shape as soon as stretching or compressing is released
What is ELASTIC FORCE?
Calculate the net force if Jane pushes a piano across the floor with a force of 25 N and Bob pushes the piano in the same direction with a force of 15 N. Are forces balanced or unbalanced? What will happen to the piano’s motion? Show your work!
25 N + 15 N = 40 N
This type of friction acts on objects when they are resting on a surface.
What is STATIC FRICTION?
The measure of the force of gravity pulling on a object.
What is WEIGHT?
A push or pull on an object
What is FORCE
What are some uses of elastic force?
answers will vary
Mike pushes a box with a force of 30 N forward, but the box resists with a force of 10 N the other direction. What is the net force? Are forces balanced or unbalanced? What will happen to the motion of the box?
30 N – 10 N = 20 N forward
This type of friction acts on objects when they are sliding over a surface.
What is SLIDING FRICTION?
Every object in the universe attracts every other object
What is the law of universal gravitation?
Force is this because it has both size and direction
What is VECTOR?
Two forces acting together causing a cannonball to move in a curved motion after it is shot is called this.
What is PROJECTILE MOTION?
John and Joe are playing tug of war. John has a force of 20 N to the right. Joe has a force of 20 N to the left. Who is winning the tug of war? Are forces balanced or unbalanced? What will happen to the motion of the box? Are forces balanced or unbalanced?
20 N – 20 N = 0 N, so no one is winning
A substance that can flow and take the shape of its container.
What is FLUID?
The path of an object as it revolves around another object in space.
What is ORBIT?
This type of fluid friction acts on objects falling through the air.
What is AIR RESISTANCE?
The man who discovered that gravity is universal
Who is Sir Isaac Newton?