Newton's Laws
What is Newton's first law of motion?
An object at rest remains at rest; an object in motion remains in motion unless acted upon by an unbalanced force.
What does it mean when forces are balanced? Provide an example.
When forces are balanced, objects in motion will stay in motion and objects at rest will stay at rest. An example of this is a book resting on a table.
Which direction does a compass always points?
North
Mass times velocity
Mass x velocity
What are the three major components of elements?
Protons, neutrons, and electrons.
What is Newton's second law of motion?
Force equals mass x acceleration
F = ma
What does it mean when forces are unbalanced? Provide an example.
When forces are unbalanced, acceleration is happening. This means an object is either moving faster or moving slower. An example of unbalanced forces is kicking a soccer ball (you exert force that accelerates the soccer ball).
What is an example of an electromagnet used in health care settings?
MRI
What is the momentum of a 2 kilogram object moving 3 meters per second North?
2kg x 3m/s = 6 kgm/s
Which particle always has a positive charge?
Proton
What is Newton's third law of motion?
For every action there is an equal and opposite reaction.
What's the difference between mass and weight?
Mass is the amount of matter in an object. Weight is a measure of the amount of force exerted on an object by gravity. Mass is measured in kilograms while weight is measured in pounds. Mass stays the same on every planet and celestial body, while weight changes based on the gravity of the planet.
What are the two poles of a magnet and which poles are attracted and repelled?
North and South poles.
Opposite poles attract each other. (North and South)
Same poles repel each other. (North and North or South and South).
Which unit do we use for force?
Newton
Which particle always has a negative charge?
Neutron
Which of Newton's laws is related to inertia?
Newton's first law
When you throw an object into the air, which force pulls the object back to Earth?
Gravity
What is produced by an electric current?
a magnetic field
Which object will exert the largest friction force: an ice cube, milk, cement, or mud.
cement, it has the roughest surface.
What does the atomic number tell us?
The number of protons in an element. The number of protons determines the element name.
Which of Newton's laws is related to momentum?
Newton's third law
What's the difference between speed and velocity?
Velocity indicates the direction. For example, speed would be 60 miles per hour, while velocity would be 60 miles per hour North.
What do you call a current carrying wire that has many loops? Does this create a magnetic field?
Solenoid
Yes, all electric currents create a magnetic field.
Which will create the largest magnetic field: an electromagnet that is turned on or an electromagnet that is turned off?
An electromagnet that is turned on. If an electromagnet is turned off it will not create a magnetic field because there is no electric current when it is turned off.
What will happen if an electron leaves an atom? What happens if an extra electron joins an atom?
When an electron leaves, the atom will have a positive charge. When an extra electron joins, the atom will have a negative charge.