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EF Study Guide Posttest
Terms in this set (23)
What is needed to make an object move?
What do you need to do to make an object stop?
Apply a force in the other direction
What is friction?
A force acting between surfaces in contact and acts to resist the motion
What happens when the amount of friction decreases?
The object is available to move easy because less force is needed to move the object
What happens when the amount of friction increases?
The object is able to move less easy because more force is needed to move the object
A cart is pushed against a wall with 500 N of force. The cart doesn't move. Name all the forces that are acting on the cart.
Gravity-pulling the cart down
Floor -pushing the cart up
Wall -pushing the cart in the opposite direction with 500N of force making the net force 0 N
Why doesn't the cart move?
-The cart does not move because equal forces are pushing in
-opposite directions.the forces acting on the cart are balanced
vIf Student A kicks a soccer ball towards the blue goal with 1000 N of force and at the same time Student B kicks the ball towards the red goal in the opposite direction with 500 N of force, what happens to the ball? (All students are kicking at the same time)
The ball moves towards the blue goal with 500 N of force
+1000 N + (-500 N) = + 0 N
If Student A kicks a soccer ball towards the blue goal with 1000 N of force and Student B kicks the ball towards the red goal in the opposite direction with 500 N
1000 N + (-500) + (-500 N) = 0 N
What poles on magnets attract?
Opposite poles attract
What poles on magnets repel?
Light poles repel
GIve a piece of evidence that there is a magnetic field around a magnet
-Donut magnet under iron filings on plate
- The chair demonstration - paper clip floatings
-paper clip jumping toward magnet
-Magnet in the desk moved the desk-this proves magnetic force can act through another material
Give an example of an object being induced with magnetism.
When a paperclip was attracted to a magnet you could pick up another paperclip with the first paper clip because the permanent magnet induced magnetism in the paperclip and made it become temporary magnet
As distance between magnets increases, what happens to the magnetic force?
As a distance between magnets increases the magnetic force
As distance between between magnets decreases, what happens to the magnetic force?
As distance between decreases the magnet force increases.
What kind of circuit is needed to run a motor?
A ____complete ___ circuit is needed to run a motor.
What are three ways to make an electromagnet stronger?
Increase thickness of wire
Increase number of D-cell batteries
Increase number of winds
What kind of metal is attracted to magnets.
iron and steel
How many variables can you change
Why should you only change this many variables?
If you changed more than one variable you would not know which variable affects the outcome
Describe the transfer of energy in a generator.
A generator turns ___kenetic_____________ energy into ________potential_______ energy.
Describe the transfer of energy in a motor.
A motor turns turns _electric______________energy into ______kenetic________ energy.
How can a hydroelectric dam be a sustainable source of energy for your home?
A hydroelectric dam which is kinetic energy (moving H2O) transfer into electrical energy the electrical energy. Then you plug in the lamp the electrical energy transfers to heat and light energy when bulb turns on.
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