Impulse/Momentum
This theorem governs the science behind car-safety; e.g seatbelts and airbags.
The Impulse-Momentum Theorem
This theorem is the reason that an object can be subject to acceleration by a force acted on it through some distance.
The Work-Energy Theorem
This is calculated through the dimensions or physical setup of a machine. Its counterpart is calculated through the input and output forces of the machine.
Ideal Mechanical Advantage (IMA)
Name the type of collisions in which kinetic energy and momentum is conserved.
Elastic collisions
Sharing its name with a metal that is liquid at room temperature, what is the name of the planet in the Solar System that is closest to the Sun?
Mercury
This law governs the science involved in figure skating and is the reason a figure skater can speed up and slow down their angular velocity.
Conservation of Angular Momentum
A satellite orbits Earth in a circular orbit. Does Earth's gravity do work on the satellite? Explain.
No, Earth's gravity acts perpendicular to the tangential/linear velocity of the satellite and therefore does no work. Centripetal forces do not do work on the object.
Machines make tasks easier by changing the direction or magnitude of the _____ exerted.
Mechanical energy consists of which types of energy? In what instance is it not conserved?
Kinetic and Potential Energy
When it is converted into another form; e.g. thermal energy
Astronomical distances are often described in what timely measurement, with one unit roughly equivalent to 5.88 trillion miles?
Light Year
Sydney strikes a 0.058kg golf ball with a force of 272N and gives it a velocity of 62.0 m/s. How long was her club in contact with the ball?
0.013s
An arrow is drawn on a bow, aimed upwards, and shot. It travels to some height and then comes back down and sticks into the ground upon impact. Describe all related aspects of work and energy in this scenario.
Work is done on the arrow and bowstring to give elastic potential energy. It is released and converts to kinetic which then changed to gravitational potential energy all the way to the max height where it is fully converted. Gravity does work on the arrow to bring it back down converting its gravitational potential energy into kinetic energy. On impact the ground does work to the arrow to stop it.
Name the 4 of the 6 types of simple machines discussed in class.
Lever, Pulley, Wheel and Axle, Inclined Plane or Ramp, Wedge, Screw
An 11yr-old Eli's mass is 28kg. He climbs the 4.8m ladder of a slide and reaches a velocity of 3.2 m/s at the bottom of the slide. How much mechanical energy did friction transform to other forms?
1175J
Which planet in our solar system is the fastest, moving at approximately 29 miles per second?
Mercury
A 50.0kg projectile is launched with a horizontal velocity of 647m/s from a 4.65kg launcher moving in the same direction at 2.00m/s. What is the launcher's velocity after the launch?
-4.94m/s or 4.94 m/s backwards
Turner pulls a sled across the snow with a force of 225N at an angle of 35 degrees above the horizontal. If he pulls the sled a distance of 65.3m, how much work does he do on the sled?
12000J or 1.2X104J
An inclined plane has a base length of 6m and a height of 8m. What is the ideal mechanical advantage (IMA) of this simple machine?
10/8 or 1.25
Connor, with a mass of 42kg, is riding a skateboard with a mass of 2.0kg and traveling at 1.20m/s. He jumps off, and the skateboard stops dead in its tracks. In what direction and with what velocity did he jump?
0.80m/s in the same direction he was traveling initially
About 2.8 billion miles from the Sun and known for its powerful wind storms, which planet is the only one you can’t see from Earth with the naked eye?
Neptune
An 845kg dragster accelerates on a racetrack from rest to 100km/h in 90.0s. What is the average force exerted on the dragster by the track through friction?
26000N or 2.6x104 N
An electric winch pulls an 875N crate up a 15 degree incline at 0.25 m/s. How much electrical power must be delivered to the winch if it is 85% efficient?
67W
A compound machine consists of a pulley system lifting one end of a lever. The pulley system is made up of 3 supporting cables that lifts a lever whose input arm length is twice the length of its output arm length. What is the ideal mechanical advantage of this compound machine?
6
Hayes kicks a 0.41kg soccer ball from the ground at a speed of 22m/s at a game one evening as a lob pass to Eli. The ball launches at an angle of 60 degrees from the horizontal and before it reaches its maximum height it collides with a 5kg goose at a height of 5m. What height do the now combined goose and ball reach?
5.08m
What small, dark stars, also known as "failed stars," are those not massive enough to sustain nuclear fusion of hydrogen into helium?
Brown Dwards