Atoms
Clue: This positively charged part of an atom is found at its center.
Nucleus
Clue: This is the region around an object where another object can experience a force.
force field
Clue: A magnet made using electric current flowing through a wire is called this.
an electromagnet
Clue: For every force, there is a force equal in strength and opposite in this.
direction
Clue: This is used to determine whether an object has changed position.
reference point
Clue: These negatively charged particles move around the nucleus.
Electrons
if two charged objects are moved farther apart, the force between them generally does this.
decreases
Clue: Increasing this in an electromagnet generally increases the strength of its magnetic field.
electric current/amount of wire coils
Clue: When you push against a wall, the wall pushes back on you with a force that is equal and this.
opposite
Clue: A student sitting on a moving bus is stationary relative to the bus but moving relative to this.
The ground, a stoplight, a person standing still on the side of the road etc.
Clue: This particle has a positive charge and is located in the nucleus.
protons
Clue: Increasing the amount of electric current through a wire will generally make its magnetic field do this.
increase/strengthen
Electromagnets are different from permanent magnets because they are
able to be turned on and off
Clue: A swimmer pushes water backward. According to Newton's Third Law, the water pushes the swimmer in what direction?
forward
Clue: Two objects are pushed with the same force. Object A has less mass than Object B. Which object will experience the greater change in motion?
Object A
Clue: An atom has a positively charged nucleus which can contain protons and _______________.
neutrons
Clue: A student compares two electromagnets. Electromagnet A has more wire coils and electric current than Electromagnet B. Which should have the stronger magnetic field?
Electromagnet A
Clue: A generator changes this type of energy into electrical energy.
mechanical energy
Clue: A rocket pushes exhaust gases downward. What force causes the rocket to move upward?
Answer: The exhaust gases push the rocket upward.
Clue: You are sitting in a moving car. To a person sitting beside you, your position is not changing. To someone standing outside, your position is changing. Explain why both observations can be correct.
Motion depends on the observer's reference point.
A student draws an atom with a negative nucleus and positive electrons surrounding it. What is wrong with the model?
The nucleus should be positive and the electrons should be negative
Clue: A magnetic object is moved from 2 cm away from a magnet to 10 cm away the magnet. Predict what will happen to the magnetic force and explain why.
The magnetic force will decrease because the objects are farther apart.
2. A student increases the number of batteries connected to an electromagnet. What will most likely happen to the electric current and magnetic field strength?
Both will increase
Clue: A student says, "The forces in a Newton's Third Law pair cancel each other out because they are equal." Explain why this statement is incorrect.
The forces act on different objects, so they do not cancel each other on the same object.
1. If 20 N pushes right and 20 N pushes left, the net force is this.
2. A box has 30 N pushing right and 10 N pushing left. What is the net force?
1. 0N and balanced
2. 20N to the right