Falling Objects
A ball rolling along a smooth sidewalk suddenly rolls onto a grassy area. What will happen to the ball’s motion?
A. It will roll faster because friction increases.
B. It will roll faster because friction decreases.
C. It will roll slower because friction increases.
D. It will roll slower because friction decreases.
C. It will roll slower because friction increases.
The speed and direction of an object's motion is its ___________.
Velocity
Why does a basketball thrown high in the air come back to the ground after a few seconds?
A. Air pressure pushes the ball downwards.
B. Earth's gravity pulls the ball downwards.
C.The Sun's gravity pushes the ball downwards.
D. Air pressure inside the ball forces it downwards.
B. Earth's gravity pulls the ball downwards.
What is the largest body in our solar system?
The Sun
If you bring the north pole of one magnet near the north pole of another magnet, the magnets will:
Be attracted, come together
The force that keeps satellites in orbit around Earth
Gravity
If an unbalanced force acts on a stationary object, the object will __________________.
A.remain stationary
B.move at a constant speed in the direction of the force
C.accelerate in the direction of the force
D.accelerate in the opposite direction of the force
C.accelerate in the direction of the force
What is the law of Conservation of Energy?
Energy cannot be created or destroyed
What orbits the Earth?
The moon, satellites
How does a compass provide evidence of Earth’s magnetic field?
The compass needle reacts to Earth’s magnetic field by pointing to magnetic north.
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.
What is the formula for Newton’s Second Law of Motion?
F=MA
What is the definition of Potential Energy?
Stored energy
In which phase of the Moon Cycle does a Solar Eclipse occur?
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?
Iron Filings
Draw a force diagram of a ball falling towards the ground
Check the slides
Grace throws a snowball with a mass of 6 kgs, it accelerates from her hand at 3 m/s2. What is the force the snowball has in Newtons?
18 Newtons
How much kinetic energy does a dog have if it has a mass of 7 kg and a velocity of 2 m/s^2?
Formula: KE= mv^2/2
14 J
In which phase of the moon cycle does a lunar eclipse occur?
Full moon
What is the magnetosphere
1. Magnetic field around the earth
2. Protects us from the Sun
When a feather and a hammer are dropped at the same time, why does the hammer hit the ground first?
Air resistance slows the fall of the feather.
Anna is driving her car with a force of 400 N and mass of 100 Kgs. How fast is she accelerating?
4 m/s^2
How much potential energy does a roller coaster have if it has a mass of 100 kg and is sitting at the top of a hill at 20 meters?
Gravity is 9.8 m/s^2, Formula: PE=MxGxH
PE= 19600 J
If we are currently in a Waning Gibbous phase, what will the moon look like in about four days?
Last Quarter
In an electric generator, ___________ will increase the output of electricity.
Increasing number of coils, Increasing speed of magnet, Increasing size of magnet