Newton's Laws
An object at rest remains at rest unless acted upon by an outside force. This law only holds from an inertial frame of reference as the word, "rest" can be relative. What is the name of this law?
Newton's First Law
What is the standard units for energy
Joules or kilogram meter squared per second squared
The name for the type of motion when there is one force applied at the beginning, after which the only influence on the trajectory is that of gravity.
Projectile Motion
What is the standard units for momentum?
kilogram meter per second
What is true about the net forces on a system for it to be static?
The sum of the forces equal zero
What is the name for something that has a magnitude and a direction?
Vector
What is the name for something that has a magnitude, but does not have a direction?
Scalar
A race car accelerates from rest at 2.7 meters per second squared for 1.5 minutes. What is the final speed of the car?
243 meters per second
The name for a collision where kinetic energy and momentum is conserved. You may think of billiard balls on a pool table.
Elastic Collision
The name for the point around which the sum of the torques equals zero for a static system.
Pivot Point
An object of mass m is placed on a table with a coefficient of static friction u. What is the equation for the force of friction on the object
umg
The type of energy that an object has being held some arbitrary distance away from some arbitrary ground.
Gravitational Potential Energy
A cannon fires a cannonball at 45 degrees above the x-axis. What is true about the x velocity of the cannonball as it leaves the cannon.
The x velocity remains constant
The name for a collision where the momentum is conserved, but their is a loss in kinetic energy.
Inelastic collision
True or False
If you throw a ball vertically upward at the top of it's trajectory the y velocity is zero and the x velocity is zero. The object is considered to be at rest at this one point. At this one point and only this point, the object is considered to be at static equilibrium.
False
The sum of the forces is not equal to zero
For every action there is an equal and opposite reaction. What is the name of this law?
Newton's Third Law
What is the formula for the type of energy that results from the compression of a spring?
1/2 k x2
A propellor of diameter 3 meters spins from rest to 25 radians per second in 2.5 seconds. What is the linear acceleration of the propellor?
15 meters per second squared
When a constant force acts for a certain period of time this is equal to a change in momentum. What is the name of this?
Impulse
A hypothetical see-saw has a 30 kg child sitting 2.4 meters away from the center of the seesaw. How far away from the center must a 0.15 kg baseball be placed in order to have the see-saw be static.
480 meters
A 5 kg box is on a 45 degree frictionless incline plane. What is the velocity of the box at the bottom of the incline plane assuming the incline plane is 8.7 meters long and the box starts from rest.
11 meters per second
If a solid disk of radius 1m and a thin hollow disk of radius 1m roll down a hill at the same time. Which disk has greater rotational energy?
The hollow disk
An investigator of a car accident sees skid marks on a road that are 250 meters long (≈ 0.155 miles). The model of this car has an engine that can accelerate at 4.2 meters per second squared. If after the car accident it is assumed the vehicle came to a complete stop. How fast was the car going before the accident in miles per hour?
1 meter per second = 2.23 miles per hour
102 miles per hour
Daily Double: Wager any amount
The change in momentum of a system divided by the time over which it changes. What is the name for this law?
Newton's Second Law
A 25 kg box is hanging vertically by String C which is connected to two other strings. String A on the left is 45 degrees above the x-axis and String B on the right is aligned with the x-axis. What is the tension in String B?
245 Newtons