Physics Paper 2

• If the speed at which an object moves through a fluid increases, will the size of the frictional force that acts on it increase, decrease or stay the same?


  increase
• Is tension a contact or non-contact force?


  contact
• What name is given to the point at which the mass of an object may be considered to be concentrated?

  centre of mass/ centre of gravitySee an expert-written answer!We have an expert-written solution to this problem!
• Object 1 has a low centre of mass and Object 2 has a high centre of mass. Which object will be more stable?


  object 1
• True or false? If the vertical line through an object's centre of mass falls within its base of support then the object will topple over.


  false
• What is the SI unit for mass? Give the full name, not the symbol.


  kilogram
• Weight is the downward pull of __________ on mass. What one word completes the sentence?


  gravity
• What is the main force that must be overcome in order to push an object along a horizontal surface?

  friction
• A lift that weighs 300 N moves a man with a weight of 950 N upwards by 12 m. How much work is done to move the lift this height?


  15,000
• Look at the equation shown below. It can be used to find the force applied to an elastic object. What does k represent? f=kxe


  spring constant
• True or false? Work must be done on an object in order to change its shape.


  true
• For a certain spring, k = 15N/m. A mass is hung from the spring, stretching it from 0.3m to 0.4m. What force did the weight produce?


  1.5N
• A spring is 14cm long. Three masses are hung from it and then it is measured again. Now it is 19.5cm long. What force did the three masses provide? The spring constant for the spring is 30N/m.


  1.65N
• True or false? Objects that can regain their original shapes have energy in their gravitational potential energy stores when their shape is changed by a force.


  false
• The spring constant, k, for a 22cm spring is 50N/m. A force is used to stretch the spring and when it is measured again it is 32cm long. Work out the size of this force.


  5
• A slinky is stretched by two forces. When the forces are removed, the slinky returns to its original length. The slinky has been __________ deformed. What word completes the sentence?


  elastically
• Johann squeezes a bagel too hard at the supermarket, and it does not return to its original shape when he removes his hand. The bagel has been __________ deformed. What word completes the sentence to show that the bagel has been permanently changed?


  inelastically/nonelastically
• True or false? In a linear relationship, a change in one variable will always result in a change of the same size in the other variable.


  false
• The equation shown is used to calculate moments. The value d is the __________ from the line of action of the force to the __________. What two words complete the FIRST gap in this sentence?

  perpendicular distance
• The diagram shows a door. Label B is 90 cm from the hinges and 60 cm from the handle. Susie pushes on label B with a force of 10 N. Calculate the size of the moment produced.


  9Nm
• True or false? A lever works as a force multiplier.


  true
• To calculate pressure it is necessary to know the force and... what else?


  area and surface area
• Fluids are which of the following?


  liquids or gases
• What units are used for the gravitational field strength when calculating the pressure due to a column of liquid? Give the words, not the symbols.


  newtons per kilogram
• What does h represent in this equation for the pressure at point X in a column of liquid? p = h ρ g


  height of the column above point x
• An object is submerged in liquid. The object's weight is equal to the upthrust on it. Will the object float?


  yes
• An apple is floating at the top of a tub of water. The apple is less dense than water, so it is displacing a volume of water that has a weight that is __________ __________ the apple's weight. Which phrase completes the sentence?


  equal to
• What is the name of the thin layer of air around Earth?

  atmosphere
• Julian is 168 cm tall. Frank is 174 cm tall. True or false? There is more atmospheric pressure at the top of Frank's head than there is at the top of Julian's head, when they stand next to each other.


  false
• Air molecules colliding with a surface create __________ pressure. What word completes the sentence?


  atmospheric
• Which experiences more atmospheric pressure: an object at sea level or an object 200 m above sea level?


  object at sea level
• The atmosphere gets less __________ with increasing altitude. What is the missing word in this sentence?


  dense
• Velocity is different from speed because it has both size and... what?


  direction
• A teacher tells his class that a train is moving at 40 miles per hour. Does this tell them the speed of the train, the velocity of the train, or both?


  speed
• Two cars are travelling side by side down a straight road in the same direction. Both cars are travelling at a speed of 22m/s. What is their relative speed?


  0 m/s
• Two cars are travelling side by side down a straight road in opposite directions. Both cars are travelling at a speed of 22m/s. What is their relative speed?


  44 m/s
• What are the SI units for speed?


  m/s (meters per second)
• What is the speed of sound in air at 0 °C?


  330 m/s
• A cat accelerates from rest to 10 m/s when it sees a dog. This takes 2 seconds. What is the acceleration of the cat?


  5
• A motorbike accelerates from 15 m/s to 25 m/s in 15 seconds. How far does the motorbike travel in this time?


  300m