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