Velocity
Newton
F/M/W
Gravity
Friction
100
What is the formula for calculating velocity?
Velocity = distance divided by time
100
When you are standing up in a subway train, and the train suddenly stops, your body continue to move. What law describes this motion and why?
This is described by Newton's 1st law because you will stay in motion until soem force, such as a person, seat, or pole stops your forward motion.
100
What is force?
Any pull or push motion!
100
What creates gravity?
Mass of an object!
100
What causes friction?
The rubbing between two objects!
200
What force slows down the velocity of an object in motion?
Friction
200
What is the formula described by Newton's second law?
Force = Mass times acceleration!
200
What is weight and what units are used to describe weight?
How much gravity is pulling on you measured in pounds or Newtons.
200
On a vector diagram, how is gravity represented?
Gravity is represented by an arrow pointing straight down toward the center of the Earth.
200
What does friction do?
Slows the motion of objects down!
300
If a car is traveling for 12 seconds and travels a total of 72 meters, what is the velocity of the car? Include the correct units.
6 meters per second
300
How many grams are one newton?
100
300
Fill in the blanks: _______ is measured in grams or kilograms using a _________________.
Mass/pan balance
300
What would happen if there would be no gravity?
Everything would float!
300
If you shoot a ball, why does it slow down?
Because of friction between the air and the ball!
400
Using the graph on page 9 of your packet, describe where the velocity is zero. How do you know?
The velocity is zero from 0 to 1 seconds and 3 to 4.5 seconds because the position does not change.
400
A pitched baseball goes faster than one that is gently thrown. What law describes this motion and why?
Newton's second law because the force on the ball's mass is more when the ball is pitched so the ball accelerates more. When the ball is gently thrown there is less force on the ball so the ball accelerates less.
400
If you traveled to the moon what will happen to your weight and mass? WHY?
You would weight less because the moon has less gravity because there is less mass in the moon! Your mass would be the same becasue your mass is the amount of grams you contain, which would not change on the moon.
400
What keeps the planets in orbit?
Gravity between the sun and the planets!
400
What force causes friction?
Electromagnetic force!
500
Use the graph on page 9 of your packet. If point A is at 0 seconds and 20 meters with points B, C, D, and E being the places where the line changes direction, Calculate the velocity from point B to C.
Velocity = 40/2 = 20 meters per second.
500
If you stand on the floor with a force of 20N, what force does the floor push on you with if your mass is 55kg? What law describes this motion and why?
The floor pushes back on you with a force of 20N. This is described by Newton's 3rd law - each force is met by an equal and opposite force.
500
What is magnitutde and how is this represented in a vector diagram?
Magnitude is a measure of how strong the force is and is represented by the size of an arrow in a vector diagram.
500
Is gravity the weakest or strongest force? How do you know?
Weakest! You can overcome gravity by jumping up into the air.
500
Why does a rolling ball have the friction arrow between the floor and the ball that is in the same direction as the motion of the ball?
As the rolling ball encounters the floor the motion of the roll is opposite the motion of the ball. The friction that slows down the rolling ball acts against this rolling motion, not the ultimate direction of the ball.
M
e
n
u