Physics paper 2

• Name the universal force of attraction that exists between masses.

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

  Kilograms
• True or false? Weight is a force.

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

  Gravity
• Name the unit which is used for weight. Give the full name, not the abbreviation.

  Newtons
• True or false? An object weighs less on the moon than it does on Earth.

  True
• True or false? An object has the same mass on Earth as it does on Mars.

  True- This statement is true. Objects have the same mass wherever they are, regardless of gravitational field strength because mass is the sum of the matter in an object.
• Jupiter's gravitational field is stronger than Earth's. On Jupiter, an object's__________ will be greater than on Earth. What one word completes the sentence?

  Weight
• The gravitational field strength on the Moon is 1.6 N/kg. Babatunde has a mass of 78 kg. What would Babatunde weigh on the Moon? Give your answer to 1 decimal place.

  124.8
• What is the equation for weight?

  Weight= mass x gravity
• What is the equation for gravity?

  Gravity= Weight / mass
• What is the equation for Mass?

  Mass= Weight / gravity
• The gravitational field strength on Mars is 3.7 N/kg. Kai has a mass of 55 kg. What would Kai weigh on Mars? Give your answer to 1 decimal place.

  203.5
• The gravitational field strength on Mars is 3.7 N/kg. Pedro has a mass of 72 kg. What would Pedro weigh on Mars? Give your answer to 1 decimal place.

  266.4
• Jupiter has a gravitational field of 23.6 N/kg. Would you weigh more or less on Jupiter than you do on Earth?

  More
• Jupiter has a gravitational field of 23.6 N/kg. Would your mass be more, less or the same on Jupiter as it is on Earth?

  Same
• Ahmed wants to measure the weight of an object. What instrument should he use?

  Newton metre
• An object's mass and its weight are... what?

  Directly Proportional
• True or false? Forces always act in pairs.

  True
• Look at the diagram below. It shows the forces acting on a car. Which of these describes the force represented by arrow B?

  Weight of the car

  
• Look at the diagram below. If the car is moving forward (to the right in the diagram), which of these describes the force represented by arrow C?

  Driving force from the engine

  
• When two objects interact they exert forces on each other. Will these forces act in the same direction or in opposite directions?

  Opposite
• Look at the diagram below. If the car is moving forward (to the right in the diagram), which label goes with force D?

  Force or friction and air resistance

  
• Leanne is riding a bike. The forward force from her pedalling is 18N. There is a backward force of 6N from friction and a backward force of 12N from air resistance. Does the speed of the bike increase, decrease or not change?

  Not change (18-6-12=0)
• 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
• Give the general name for the type of quantity that has magnitude but no particular direction.

  Scalar
• Is time a vector or a scalar quantity?

  Scalar
• Give the general name for the type of quantity that has magnitude and acts in a particular direction.

  Vector
• Is force a vector or a scalar quantity?

  Vector
• Choose the best way to complete the sentence. Every force on an object is either...

  a contact force or a non-contact force
• Is friction a contact or non-contact force?

  Contact
• Is magnetic force a contact or non-contact force?

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

  Contact
• Does Earth exert a contact or a non-contact force on the moon?

  Non-contact
• A single force can be resolved into two component forces that act at _____° angles to each other. What number completes the sentence?

  90
• Look at the equation below. What units are used for W? Give the full name, not the symbol.

  Newtons

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

  centre of mass
• The diagram below shows the different forces acting on a car. Which of these describes the force represented by arrow A?

  normal force contact

  
• Look at the experiment described below. Which point marked on the object shows its centre of mass?

  D

  
• Look at the free body diagrams. Which one is not equivalent to the others?

  B would have 0 resultant force, but the other diagrams have a resultant force to the upper right.