Inv. 1
What is force?
A push or pull on an object
What is a magnet?
An object that responds to magnetic fields
What is electricity?
The flow of electrons through a circuit
Pushing on a car is +600N. Friction is -400 N
What is the Net Force ?
+200N, car moves to the right
What makes things move?
Force, unequal forces on an object, net force is not zero, enough force to move a mass or stronger than friction
What direction does friction go?
Opposite to the force of motion
Where is magnetic force the strongest on a magnet?
At the poles
What are the three components of a circuit?
Power source, conductor, and load
Engine force of a car is -1000N. Friction is +200N
What is the Net force?
-800N, car moves to the left
How does friction affect the force needed to move an object?
More friction -> more force needed, can slow down the object, less friction -> less force needed, can keep the object going at the same speed
What are two things that can affect how much force is needed to move an object?
Mass and friction
If I have a magnet and a piece of iron, how can I cause motion without touching the two?
Move the magnet close enough to the iron to pull it towards the magnet.
What can you do to make an electromagnet stronger?
Add an iron core or add a wire coil around the core
-5N, to the left
How do multiple forces affect motion?
friction, push/pull, gravity, magnetism, electromagnetism, net force
Which of Newton's 3 Laws of Motion best explains why you are able to walk forward when you step on the ground?
Newtons 3rd Law.
What are the two forces that magnets can do?
Attract and repel
How is electromagnetism related to force?
Electromagnetism is a type of force that can cause motion, either between magnets or with magnetic materials. Electricity is a type of energy and energy is needed to create force.
In a game of soccer, Player 1 kicks the ball with +1000N of force, Player 2 kicks the ball with -350N of force, and Player 3 kicks the ball with -650N of force.
What is the Net force?
0N, no change
What happens when magnets interact?
Same poles repel, opposite poles attract. Magnetic field forms around the magnet and will attract magnetic materials (like iron)