Quiz 1
What force keeps satellites in orbit around Earth
Gravity
What is the formula for Newton's Second Law of Motion
F=MA
What is potential energy?
Stored energy
What is the largest object in our solar system?
The Sun
Opposite poles ______________
Like poles ___________________
Opposite poles attract
Like poles Repel
What is gravity?
Gravity is a pulling force between all objects
If an unbalanced force acts on an object, what will that object do?
Accelerate in the direction of that force
Why does a basketball thrown high in the air come back to the ground after a few seconds?
Earth's gravity pulls the ball down
What phase of the moon cycle does a solar eclipse occur?
During a New Moon
A mixture of salt, sand, chalk dust, and iron filings must be separated. Which part of the mixture can be separated using a magnet?
The iron filings
If you were to go to the moon, you would weigh less than you do on Earth. Why?
The moon has less mass than Earth, therefore it has less gravity
What is the speed and direction of an object?
Velocity
Newton's third law of motion states that _______________.
For every action, there is an equal and opposite reaction.
In which phase of the moon cycle does a lunar eclipse occur?
Full Moon
If you bring the north pole of one magnet near the north pole of another magnet, the magnets will..
Repel each other or push away
Draw a force diagram of a ball falling towards the ground
See slideshow
Grace throws a snowball with a mass of 2 kgs, it accelerates from her hand at 9 m/s^2. What is the force the snowball has in Newtons?
F= 2x9
F= 18 N
How much potential energy does a roller coaster have if it has a mass of 250 kg and is sitting at the top of a hill at 45 meters? Gravity is 9.8 m/s^2, Formula: PE=MxGxH
PE= 250x9.8x45
PE= 110,250 J
What are the two parts of the shadow called in an eclipse?
Umbra and Penumbra
How does a compass provide evidence of Earth’s magnetic field?
The compass needle aligns with Earth’s magnetic field to magnetic north.
When a feather and a hammer are dropped at the same time, why does the hammer hit the ground first?
Air resistance or friction slows the fall of the feather
Anna is driving her car with a force of 80 N and mass of 2 Kgs. How fast is she accelerating?
80= 2xA
A= 40 m/s^2
How much kinetic energy does a dog have if it has a mass of 9 kg and a velocity of 6 m/s?
KE= 9x6^2/2
KE= 162 J
If we are currently in a Full Moon, what phase will we be in in about four days?
Waning Gibbous
In an electric generator, what will increase the output of electricity?
Increasing the speed of the magnetic field or the number of coils