Physics

• What is the formula for acceleration? $a=$$v1-v0/t$

  v1 - final velocity

  v0 - starting velocity

  t - time
• Acceleration is the rate of change of velocity per unit time. A car accelerates uniformly from 15 kph to 45 kph in 10 seconds. Find its acceleration

  Answer: 3km/hr-sec
• Potential energy or energy of position is the product of the weight of an object and the height to which the object is elevated. A machine weighing 5000 N is raised onto a roof of a building 50 m high. Calculate the increase in potential energy.

  Answer: 2.5 x $10^5$ Joules
• What is the formula for potential energy? U=mgh

  m - mass

  g - gravitational pull

  h - height
• Answer: B

  
• Answer: A

  
• Weight is a force while mass is amount of matter
• Law of Inertia - an object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
• Law of Acceleration - the acceleration of an object depends on the mass of the object and the amount of force applied.
• Law of Action & Reaction - whenever one object exerts a force on another object, the second object exerts an equal and opposite on the first.
• Answer: B

  
• Answer: C

  
• What type of energy does water have when it falls from a dam? Kinetic energy
• Answer: A

  
• Answer: A

  
• An iron block is placed in a furnace where it is heated and consequently expands. In the expanded condition, its density is? Becoming Less
• Density - how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass).
• Density - is the mass per unit volume
• Answer: B

  
• Buoyant force - is the upward force exerted on an object wholly or partly immersed in a fluid. This upward force is also called Upthrust.
• Answer: B

  
• A rock suspended by a string weighs 5 N out of water and 3 N when submerged. What is the magnitude of the buoyant force on the rock? 2 N



  Explanation:

  
• Answer: B

  
• Airplane flight best illustrates what principle? Bernoulli's Principle which states that the pressure of a fluid decreases as its speed increases, and vice versa. This principle applies to both liquids and gases such as air.
• Answer: C

  
• What is the main function of a diode in an electronic circuit? Purification
• Momentum - is a measurement of mass in motion: how much mass is in how much motion.
• Formula for momentum p=m x v

  m - mass

  v - velocity
• Impulse - is a term that quantifies the overall effect of a force acting over time.
• The splitting of different colors of light in a prism is called dispersion.
• Scalar quantities are quantities that only have magnitude or size. On the other hand, vector quantities are quantities that have both magnitude and direction.
• How many significant figures does the value 1000.0 grams have? Five
• Which scientist pioneered the planetary model of an atom? Neils Bohr.
• What is the force that pulls a rotating object away from the center of its rotation? Centrifugal force.
• When an object is placed in a higher position, what energy increases? Potential Energy
•  Which factors are involved in Gay-Lussac’s Law? Pressure and temperature
• When you go to a higher altitude, what happens to the boiling point of water? It decreases
• What principle states that in an undistributed sequence of sedimentary rocks, the oldest layers are at the bottom and the youngest layers are at the top? Principle of Superposition 
• Gabe’s car conked out in the middle of an expressway. He had to apply a force of 1200 N to push the car 200 m to the nearest gas station. Determine the work done on the car.

  Answer: 240,000 J
• What is the formula for work? w=f x s

  f - force

  s - displacement