Topic 9

Question 1

9.1
What is a non-contact force. Give examples

Answer 1

-Acts between 2 objects over a distance
-Magnetic F
-Electric F (Electrostatic)
-Gravitational F
-Weight

Question 2

9.1
What is a contact force. Give examples

Answer 2

-Can only be applied when objects touching
-Friction
-Tension
-Thrust/Upthrust
-Air resistance
-Reaction F

Question 3

9.1
Describe the effect of friction

Answer 3

Transfer of thermal energy

Question 4

9.4
State 4 features of a free body force diagram

Answer 4

-Object = circle
-All Forces drawn to scale
-All F labelled
-All F act from centre of object

Question 5

9.4
Draw a free body force diagram for a box being pushed by a worker

Answer 5

https://www.ecosia.org/images?q=free%20body%20force%20diagram&addon=opensearch#id=CD1099107039E4BFF79204B55096FDAF10853B44

Question 6

9.7
State the equation for the moment of a Force. Give units

Answer 6

moment of Force (Newton metre: N m) = Force (N) × normal* d to direction of F (m)

*perpendicular