9I - Forces and Motion

Question 1

Speed ( KM / H )=

Answer 1

Distance ( KM) / Time ( H )

Question 2

Moments ( NM ) =

Answer 2

Force ( N ) x Distance from PIVOT ( M )

Question 3

Work Done ( J )

Answer 3

Force ( N ) x Distance in direction of FORCE ( M )

Question 4

The main stores of energy are

Answer 4

Kinetic , Gravitational Potential , Elastic Potential , Chemical and Thermal

Question 5

Example of Kinetic energy store

Answer 5

Any moving object (car, airplane, e.t.c.)

Question 6

Example of Gravitational potential store

Answer 6

Any object above the ground (holding a book up)

Question 7

Example of Elastic Potential energy store

Answer 7

Any object with a rubber band (Slingshot)

Question 8

Example of chemical energy store

Answer 8

Food, Coal, Batteries

Question 9

Example of Thermal energy store

Answer 9

A radiator

Question 10

The main energy transfers are

Answer 10

Heating , Electrical , Radiation and Mechanical

Question 11

Example of Heating transfer

Answer 11

Friction

Question 12

Example of electrical transfer

Answer 12

plugging in a socket

Question 13

Example of radiation transfer

Answer 13

turning on a light

Question 14

Example of mechanical transfer

Answer 14

steam or fuel in a car

Question 15

Accelerate

Answer 15

get faster

Question 16

Upthrust

Answer 16

a force that acts upwards

Question 17

Friction

Answer 17

-A force that acts between two things touching
-Can be reduced by two smooth surfaces and lubricants

Question 18

Air resistance

Answer 18

a force that acts to slow down things moving through the air

Question 19

Water resistance

Answer 19

a force that acts to slow down things moving through the water

Question 20

Resultant

Answer 20

The difference between the forces in one direction and the opposite direction

Question 21

Balanced Forces

Answer 21

when all the forces in one direction are exactly the same size as the forces in the opposite direction

Question 22

Weight

Answer 22

A downwards force caused by gravity

Question 23

Unbalanced forces

Answer 23

-Can change the speed or direction of movement of an object
-When forces acting in opposite directions aren’t the same length

Question 24

Drag

Answer 24

• Another name for resistance (Any kind)
• Usually acts to slow down or stop moving objects

Question 25

Balanced forces affect objects by:

Answer 25

- keeping them stationary - moving an object with constant speed

Question 26

Renewable source:

Answer 26

Renewable resources are an energy source that cannot be depleted and are able to supply a continuous source of clean energy. Can it replenish itself in a lifetime?

Question 27

Non-renewable source:

Answer 27

A non-renewable resource is a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption.

Question 28

Class 1 Lever

Answer 28

Load is on the other side of a pivot

Question 29

Example of a class 1 lever

Answer 29

Seesaw

Question 30

Class 2 lever

Answer 30

Load is 'inside' the effort

Question 31

Example of a class 2 lever

Answer 31

Wheelbarrow

Question 32

Class 3 Lever

Answer 32

Load is 'outside' the effort

Question 33

Example of class 3 lever

Answer 33

Biceps

Question 34

Moment

Answer 34

A turning force

Question 35

Work done

Answer 35

energy transferred

Question 36

Relative Speed

Answer 36

The speed of one object in relation to another

Question 37

How to find relative speed

Answer 37

-If in same direction, ADD -If in opposite directions, SUBTRACT

Question 38

Pulleys

Answer 38

A simple machine that can change the applied force of the work done

Question 39

Simple Machine

Answer 39

A mechanical device that changes the direction or size of the force in order to make the task easier

Question 40

How do pulleys work

Answer 40

They change the direction of force, making it much simpler for us to move objects. They increase mechanical advantage.

Question 41

Energy efficiency

Answer 41

-When the energy is used more than wasted. -When less energy is used to perform the same task