??Mystery??
Which state of matter is most dense?
What is the name for the energy an object stores because it is high above the ground?
Potential
Newton's Third Law states that for every action force, there is an equal and opposite what?
Reaction force
What is the Formula for Kinetic Energy?
KE = 0.5mv2
A person is pushing against a wall. What force is the wall pushing back with?
Normal Force
What are the two types of waves? (NAMES!)
1. Longitudinal / Compressional
2. Transverse
If you move a boulder from a 100-meter cliff to a 200-meter cliff, what happens to its stored energy?
It doubles
Which of Newton's laws explains why a passenger slides forward in their seat when a car suddenly stops?
Inertia (Newton's First Law)
Look at the graph on the TV (Ms. Scott- put it up please). The graph shows the kinetic energy our solar system planets contain.
Based on the graph, what is the primary factor increasing a planet's kinetic energy?
Planets closer to the Sun have a greater amount of Kinetic Energy
If an object has a 10 N force pushing it left and a 10 N force pushing it right, what is the net force?
0 N
How do scientists determine the exact age of rocks?
Radiometic / Carbon/ Absolute dating
Besides height, what other property of a boulder on a cliff determines how much potential energy it has?
Mass (weight)
According to Newton's Second Law, if you push two objects with the same amount of force, which one will accelerate faster?
The lighter one
A 2 kg book is sitting on a shelf that is 3 meters high. What is the book's potential energy (with units!)?
60 J
Static or kinetic friction?
a) You try to push a heavy couch across the living room floor. You push as hard as you can, but the couch does not budge at all.
B) A child is riding a wooden sled down a snowy hill. The sled is zipping along the surface of the snow at a constant speed.
C) A group of people is trying to move a car that ran out of gas. At first, they push and push, but the car stays still. Finally, the car starts to roll, and they continue pushing it down the street.
a) Static
b) Kinetic
c) Kinetic
What is the last stage of life for a massive star?
Black hole OR Neutron star
When two trains crash, most of the kinetic energy transformed to what two types of energy?
Heat and Sound
If a person pushes against a wall with 50 Newtons of force, how much force does the wall push back with?
50 Newtons
A student kicks a 0.45 kg soccer ball, and it travels at a speed of 20 meters/second.
What is the Kinetic Energy of the ball (with your units!)?
90 Joules
A 15N box is being pushed to the North across a desert with 23N of force. The force of friction is 3N and the air resistance is 23N (windy!).
What is the Net Force of the box? (direction and magnitude)
The box will be blown with 3N South