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Definitions
Projectile Motion
Newton's Laws
Which Law am I?
Miscellaneous
100
What is acceleration?
A change in velocity over time. Can be an increase in velocity, a decrease in velocity, or a change in direction.
100
What direction is acceleration pointed in projectile motion?
Down
100
What is Inertia?
A property of matter! The resistance an object has to a change in its state of motion.
100
A car is easier to push than a bus.
Newton's 2nd law
100
What is the unit for weight?
Newtons
200
What is the difference between weight and mass?
Mass is amount of matter, weight is mass multiplied by the acceleration of gravity
200
What is the only equation used in the horizontal direction in projectile motion and WHY?
V = x/t because there is no acceleration in the x direction!
200
What is Newton's second law?
F = ma! Unbalanced forces cause accelerations.
200
You run your bike into a tree and are thrown forward.
Newton's 1st law
200
What direction is friction pointed in?
opposite motion
300
Speed with a direction
Velocity
300
For an object thrown straight up, what is the velocity and acceleration at the top of the trajectory?
v = 0, a = -9.8 m/s^2
300
An object at rest stays at rest and an object in motion stays in motion with constant ___________ and ____________ unless acted upon by an unbalanced force.
Speed and direction
300
You let the air out of a balloon and it shoots forward
Newton's 3rd law
300
What is different on the moon, your weight or your mass?
Weight
400
What is pressure?
force per unit area
400
If a paper rocket's initial velocity is 4.5 m/s, what is it's final velocity as it crashes back to the ground?
-4.5 m/s
400
What is Newton's Third law?
For every action, there is an equal and opposite reaction.
400
A baseball hit with a bat goes farther than a basketball hit with the same bat
Newton's 2nd law
400
What are two things that air resistance depends on?
speed and area
500
If a book is sitting on the table, what is the name for the supportive force of the table on the book, keeping it from accelerating downward?
Normal force
500
What variables affect the time a projectile spends in the air?
Height, vertical (y) velocity If air resistance is present, mass/area
500
How does a rocket demonstrate all of Newton's Laws?
1st: Has a lot of inertia! Stays at rest until acted upon by an unbalanced force. 2nd: The force of the fuel causes the rocket to accelerate upward 3rd: The burning fuel shoots out the back of the rocket, causing the rocket to shoot forward
500
If you stand on a skateboard and push off the wall, you accelerate away from the wall
Newton's 3rd law
500
Why do object fall at the same rate towards earth (in the absence of air resistance)?
The acceleration of gravity is the same for every object.