1 Forces and Motion

Question 1

FORCES AND MOTION

Question 2

explain the generator effect

Answer 2

When there is relative movement between a conducting wire & a magnetic field, a voltage
will be induced. For example, if conducting wire moves across a magnetic field, a voltage
is induced in it. If it is part of a complete circuit, this causes a current to flow.

Question 3

how to increase induced voltage

Answer 3

moving the wire more quickly,
- using a stronger magnetic field,
- or increasing the length of the wire inside the magnetic field (eg. by making it more
coiled).

Question 4

do sound waves travel faster in solid than liquids, and faster in liquids than gases

Answer 4

yes

Question 5

DEFINE critical angle

Answer 5

the cirtical angle is the angle of incidence within an optically denser medium when the light is refracted at 90 degrees to normal

Question 6

v^2 =

Answer 6

u^2+2as

Question 7

a =

Answer 7

v - u / t

Question 8

practical: investigate the motion of everyday objects such as a toy car or tennis ball

Answer 8

Apparatus: stop watch and metre rule
1.mark the start and end positions for the know distance
2.use a metre rule to measure the distance
3.line up front of car with start point, release and start timer
4.move eyes to end point
5.stop timer when front of car passes end point
6.improve by repeating and averaging
7.make sure car starts from stationary
8.calculate average speed using : average speed = distance travelled/ time taken