Topic 9 - Forces and their effects

Question 1

Interactions between objects cause

Answer 1

Forces

Question 2

A force is

Answer 2

a push or pull on an object cause by it interacting with something

Question 3

Objects interact in 3 ways

Answer 3

At a distance without contact
By contact
Producing pairs of forces

Question 4

Nn-contact forces cause and examples

Answer 4

Interacting fields:
Gravitational fields causing attraction
Magnetic fields causing attraction or repulsion between magnets
Electric fields causing attraction and repulsion between electric fields

Question 5

Conatct forces cause and examples

Answer 5

Objects touching eachother:
Normal contact force
Friction

Question 6

Whenever two objects interact

Answer 6

The feel opposite and equal forces

Question 7

The oppsoite and equal forces are called an

Answer 7

Interaction pair

Question 8

Interaction pairs can be represented with

Answer 8

A diagram with a pair of arrows(vectors) on an object diagram

Question 9

Scalars have

Answer 9

Only magnitude

Question 10

Vectors have

Answer 10

Magnitude and direction

Question 11

Vectro diagrams process

Answer 11

Draw the vectors onto a diagram from the same starting point.
Connect them with a line
The resultant vector is the resultant force
Use the length and angle to fidn the vector

Question 12

Objects are in equilibrium if

Answer 12

The resultant force is 0. The scale diagram shows the last force ending at the starting point

Question 13

A free force diagram is

Answer 13

An isolated body and all the forces acting on it. The size of the arrows shows the magnitude of force, and direction

Question 14

Resultant force is

Answer 14

The total force acting in one direction or overall on an object

Question 15

Objects in equilibrium behaviour

Answer 15

Stay stationary or move at a steady speed

Question 16

The turning effect of a force is called a

Answer 16

Moment

Question 17

Forces cause rotation when

Answer 17

The force is exerted at a distance from the pivot

Question 18

Moment(Nm) =

Answer 18

Force(N) x Distance from pivot(m)

Question 19

Sum of clockwise moments(when object is in equilibrium)=

Answer 19

Sum of anticlockwise moments

Question 20

Gears are

Answer 20

Circular cogs with teeth around their edge. they cause other gears to turn in the opposite direction

Question 21

Levers and gears transmit

Answer 21

The rotational effects of forces

Question 22

The ratio of moments of two gears =

Answer 22

The ratio of the gears’ radii

Question 23

Gears are made more efficient by

Answer 23

Lubrication to reduce unwanted transfers to friction