Force Production

Question 1

A force is a _____ or pull which ______ or attempts to alter a body’s state of rest, or uniform motion in a straight line

Answer 1

• push

- alters

Question 2

Forces can be both _______ and ________ but this depends on how your system is defined

Answer 2

• internal

- external

Question 3

Force diagrams use ________ to show the magnitude, __________, point of application and line of _______ of a force

Answer 3

• arrows
• direction
• action (LOA is dotted)

Question 4

To achieve maximum in any one single direction, you must reduce the amount of force causing movement in any other ____________

Answer 4

-direction

Question 5

____________ force is when the LoA passes through the CoG of the body on which it acts

Answer 5

-concentric

Question 6

_____________ force is when the LoA does not pass through the CoG of the body on which it acts

Answer 6

-eccentric

this causes rotation/turning, spinning if it’s a sphere/circle

Question 7

The efficacy of ________ force depends on the _________ of the force and the degree to which is is applied off centre

Answer 7

• eccentric

- strength

Question 8

______ is a moment of force and is equal to force x moment arm (distance from centre)

Answer 8

• torque

e. g. kids on a seesaw, balancing groceries on bike handles

Question 9

a _______ ________ is when 2 equal and opposite parallel forces are applied to a body to cause it to ________

Answer 9

• force couple

- rotate

Question 10

a force through the CoG tends to cause _________

Answer 10

-translation

Question 11

a force couple causes _______

Answer 11

-rotation

Question 12

eccentric forces cause _________ and _________

Answer 12

• translation

- rotation

Question 13

Newton’s first law states that every body continues to be at rest or in uniform motion unless compelled to change by an _________ _____

Answer 13

• external force
• eg a 60kmph car stops, but the objects inside will continue travelling at 60kmph until they are stopped by a force (seatbelt, windscreen etc)

Question 14

newton’s first law is also called the law of ______

Answer 14

-inertia

Question 15

newton’s ________ law states that the total force on a body is equal to the mass x _________

Answer 15

-second
-acceleration
so more force = more acceleration but depends on the mass of the object

Question 16

newton’s third law states that to every action, there is an _______ and ________ reaction

Answer 16

• equal
• opposite
• we can’t always see this

Question 17

centripetal force is a force whose LoA is directed towards the centre of _________ of a rotating body. this prevents the rotating body from leaving its circular path

Answer 17

-rotation

Question 18

Although forces are of equal strength, the effects can be _______

Answer 18

• different

e. g. earth, varying masses etc.