FULL SOLUTION QUESTIONS AND
CORRECT ANSWERS GRADED A+
●● What are the properties of vector quantities?
Answer: They have magnitude and an associated direction
●● How can you represent a vector quantity using a symbol?
Answer: With an arrow where the length of the arrow represents the
magnitude, and the direction of the arrow the direction of the vector
quantity
●● What is a force?
Answer: A push or pull that acts on an object due the interaction of
another object
●● What is a contact force?
Answer: A force that acts between two objects that are physically
touching each other
●● Name four contact forces
Answer: Friction, air resistance, tension and normal
,●● What is Newton's Third Law of motion?
Answer: When a contact force acts between two objects, both objects
experience the same size force, but in opposite directions
●● What is a non-contact force?
Answer: Non-contact forces are forces that act between two objects that
are not physically touching each other
●● Name three non-contact forces
Answer: Gravitational force, electrostatic force and magnetic force
●● What is weight?
Answer: The force acting on an object due to gravity
●● What does the weight of an object depend on?
Answer: The gravitational field strength at the point where the object is
●● What is the equation that links weight, mass and gravitational field
strength?
Answer: Weight = mass x gravitational field strength if [W=mg]
●● What is the relationship between the mass of an object and its
gravitational field?
,Answer: The more mass an object has the greater its gravitational field
●● What is the unit of gravitational field strength?
Answer: Newtons per kg [N/kg]
●● What is the unit of weight?
Answer: Newtons (N)
●● What is the unit of mass?
Answer: Kilograms (kg)
●● What is the 'centre of mass' of an object?
Answer: A single point in an object where the weight may be considered
to act
●● How do you measure weight?
Answer: Using a calibrated spring-balance (a newtonmeter)
●● What's the relationship between the weight and the mass of an
object?
Answer: They are directly proportional
●● What is a resultant force?
, Answer: A single force that replaces a number of forces acting on an
object that has the same effect as all of the original forces acting together
●● When does a force do work on an object?
Answer: When the force causes a displacement of the object
●● What is the equation that links work done, force and distance?
Answer: work done = force × distance [W=Fs]
●● What is the unit of work done?
Answer: Joules (J)
●● When is one joule of work done?
Answer: When a force of one newton causes a displacement of one
metre; 1 joule = 1 newton-metre
●● When work is done against the frictional forces acting on an object
what does it cause?
Answer: An increase in temperature of the object
●● What must be acting to change the shape of a stationary object?
Answer: More than one force