Forces

Question 1

What does a scalar quantity have?

Answer 1

magnitude, for example, three apples.

Question 2

What does a vector quantity have?

Answer 2

magnitude AND direction e.g 7mph north east

Question 3

What features of arrows can represent vector quantities?

Answer 3

the length of the arrow can show the magnitude and the arrow points in the direction the vector quantity is acting.

Question 4

When does a force occur?

Answer 4

when two or more objects interact

Question 5

what are the groups of contact forces?

Answer 5

contact and non-contact

Question 6

What are the non-contact forces?

Answer 6

gravitational force
electrostatic force
magnetic force

Question 7

what are the contact forces?

Answer 7

friction
air resistance
tension 
upthrust
normal contact force

Question 8

What is a basic explanation for gravity?

Answer 8

a force of attraction between all masses.

Question 9

what is the mass of an object related to?

Answer 9

the amount of matter it contains and is constant

Question 10

what is the weight?

Answer 10

the force acting on an object due to gravity

Question 11

what does the weight of an object depend on?

Answer 11

the gravitational field strength where the object is and is directly proportional to its mass.

Question 12

What is a resultant force?

Answer 12

when more than one force acts on an object, these forces can be seen as a single force that has the same effect as all the forces acting together.

Question 13

What counts as “work done on an object”? and why is this?

Answer 13

when a force causes the object to move, be cause it requires energy to move an object.

Question 14

when is one joule of work done?

Answer 14

when a force of one newton causes a displacment of one metre.

Question 15

what is displacement?

Answer 15

distance moved

Question 16

what does more than one force applied to an object do to the object?

Answer 16

changes the shape of the object

Question 17

what is the object called when the object returns to its original shape after the forces are removed?

Answer 17

elastically deformed

Question 18

what is inelastically deformed?

Answer 18

when the object does not return to its original shape

Question 19

what is the extension of an elastic object directly proportional to?

Answer 19

the applied force

Question 20

what does it mean if the extension of an elastic object is directly proportional to the applied force?

Answer 20

they have a linear relationship and produce a straight line on a force-extension graph.

Question 21

what happens when the limit of proportionality has been exceeded? –2

Answer 21

-doubling the force will not double the extension
-the relationship becomes non-linear
a force-extension graph will stop being a straight line.

Question 22

what does it mean when it is past its limit of proportionality?

Answer 22

it becomes inelastically deformed

Question 23

what is Hooke’s law?

Answer 23

the theory of elasticity–the extension of a spring is proportional to the force applied to it

Question 24

what no longer applies once past the limit of proportionality?

Answer 24

Hooke’s law.

Question 25

what is It called when a force causes an object to rotate around a pivot point?

Answer 25

a moment of force

Question 26

when is the force increased?

Answer 26

when the applied force moves further than the transmitted force.

Question 27

when is the distance increased?

Answer 27

when the applied force is bigger than the transmitted force.