Magnets
Where is the magnetic force of a magnet weakest? A shown in the photo
Furthest fromthe poles
THe combination of multiple forces which act on an object.
Net Force
A friction-like force that affects an object moving through a liquid or air.
Drag
A ___________ allows electrical charges to move freely.
electrical conductor
Stored energy that an object has due to its position, condition, or chemical composition.
potential energy
Does a north pole of a magnet repel of attract another north pole of a magnet?
repel
_______________ says that the object which is in motion will stay in motion.
Newton's First Law of Motion.
Resistance of an object to a change in motion.
Inertia
Name one thing that uses an electromagnet.
Door bell, galvanometer, and electric motor.
Give an example of kinetic energy.
A person walking, a bird flying, or any object moving.
What is an attractive property of a magnet?
Magnets attract ferromagnetic such as iron, colbalt, and nickel.
What is Universality of Gravity?
Every objecct is the universe exers a gravitational pull on every other object, regardless of size of composition, with the strength of that pull depending on the mass of the object and the distance between them.
Objects can be charged in many ways. If a peron is rubbing a balloon on his/her head, What method is a person using to charge the balloon.
Friction
A coil of wire with an electric current in it that procuces a magnetic field is ?
Solenoid
______________ energy represents the energy which an object has when its motion and position are concidered.
Mechanical Energy
What is a directive property of a magnet?
freely suspended magnets point in a north-south direction.
The mass of of a rock is 36,000 kg.
The acceleration due to gravity is 9.8 m/s.
F=M x A
What is the Force?
352,800 N
The force of attraction or repulsion generated by spinning electric charges in the magnets are called?
Magnetic Forces
What happens if we switch off the current in an electromagnet?
If we switch it off, this is no electrical current. This tells us there is no induced magnetic field.
List two factors that determine an object's gravitational potential energy.
The mass of the object
It's height above the ground.
What is the difference between Earth's magnetic and geographic poles?
Geographic poles are the exact points on earth axis, while the magnetic poles are where the Earth's magnetic field is strongest.
If a person pulls on a cart to the right with a force of 10 N and a second person pulls to the left with a force of 4 N, what is the net force?
Hint: Net force is the sum of all forces acting on an object
6N to the right.
An object's velocity can be changed by changing its speed, its direction, or both?
True or False
True
List two ways in which the strength of a electromagnet can be increased?
Increase the current strength
Increasing the number of the windings or coils.
Mechanical energy represents the total sum of kinetic and potential energy.
If we take a look at 2.5 seconds, the helicopter has a kinetic energy of 20 J. We are also aware of the fact that power represents energy per time.
What is the mechanical time?
20 J /2.5= 8J per second