Forces and their Interactions

Question 1

describe what is meant by a scalar quantity and give examples

Answer 1

magnitude only

eg: time, mass , temp, speed, direction

Question 2

describe what is meant by a vector quantity and give examples

Answer 2

have magnitude and an associated direction

eg: momentum, forces, acceleration, displacement

Question 3

describe what is meant by a contact force and give examples

Answer 3

where the objects are physically touching

eg: friction, air resistance

Question 4

describe what is meant by a non-contact force and give examples

Answer 4

where the objects are physically separated

eg: magnetic force and gravitational force

Question 5

describe what is meant by weight

Answer 5

its the force acting on an object due to gravity.

Question 6

state what the weight of an object depends on

Answer 6

the gravitational field strength at the point where the object is

Question 7

state how you would measure weight

Answer 7

using a calibrated spring-balance (newtonmeter)

Question 8

describe the relationship between the weight of an object and the mass of an object

Answer 8

they are directly proportional

Question 9

state what is meant by resultant force

Answer 9

a number of forces acting on an object may be replaced by a single force that has the same effect as all the original forces acting together. the single force is called the resultant force