physics

Question 1

topic 1
what is a vector and a scalar and give examples?

Answer 1

Scalar is a quantity with only magnitude but no directions. e.g. are speed, direction, temperature
vector is a quantity with both magnitude and direction.
e.g. are velocity, acceleration, displacement, force

Question 2

topic 1
what is the differences between speed and velocity?

Answer 2

speed is a scalar quantity, it only tells us how fast you travelling not the direction.
velocity is a vector quantity and it tells us the speed in a particular direction

Question 3

topic 1
can a object change its velocity whilst travelling in constant speed?

Answer 3

yes, as velocity is both magnitude and direction so if the object is changing in direction whilst going in constant speed, its considered to be changing in velocity due to velocity being speed in a particular direction

Question 4

topic 1
the equation of speed?

Answer 4

speed=distance/time

Question 5

topic 1
objects speed
walking, running, cycling, cars in built up area, cars on a motor way, plane, trains, ferries, wind speed, speed of sound.

Answer 5

1.4ms,3ms,5.5ms,13ms,31ms,250ms,55ms,15ms,5-20ms,340ms

Question 6

topic 1
how to calculate speed in irl?

Answer 6

light gates are very efficient in finding out the time the object travelled and it will have no human errors like the stop watch.
using a measuring tape can help us identify how far the object traveled.

Question 7

topic 1
what is acceleration?

Answer 7

acceleration is the rate of change of velocity

Question 8

topic 1
how to calculate acceleration?

Answer 8

v-u/t

Question 9

topic 1

Question 10

topic 1
what’s negative acceleration

Answer 10

deceleration. negative when decelerating

Question 11

topic 1
what is uniform acceleration/ constant acceleration?

Answer 11

acceleration due to gravity is called uniform acceleration (10 n/kg). objects free fall

Question 12

topic 1
equation of uniform acceleration?

Answer 12

final velocity squared-initial velocity squared = 2 * acceleration*distance

Question 13

topic 1
distance time graph
gradient?
horizontal line?
vertical line?
curves?

Answer 13

the gradient in a distance time graphs tells us the average speed.
the horizontal line shows how they have stopped.
vertical line shows how they are going in a steady pace.
curves represent acceleration and deceleration.

Question 14

topic 1
velocity time graph?
gradient?
flat lines?
steeper the graph?
uphill lines?
down hill lines?
curve?
area?

Answer 14

gradient equals to acceleration because a=change in v over time
flat lines represent steady speed.
steeper the graph, the more its constantly accelerating or decelerating
uphill lines shows constant acceleration
downhill line shows constant deceleration.
curves shows changing acceleration
area shows distance.

Question 15

topic 1
what is newtons first law?

Answer 15

if the resultant force on a stationary object is zero, the it will stay stationary.
of the resultant force on a moving object is zero, then it will continue moving in the same direction and at the same velocity

Question 16

topic 1
what is centripetal force of attraction?

Answer 16

if an object is traveling in a circular orbit, the object is constantly changing acceleration. thus its accelerating. there is a resultant force acting on it and its know as centripetal force as it acts on the center of circle

Question 17

topic 1
a non zero resultant force always produce?

Answer 17

acceleration.

Question 18

topic 1
newtons second law?

Answer 18

the force and acceleration is directly proportional. acceleration is inversely proportional to mass.
f=m*a

Question 19

topic 1
what is inertia?

Answer 19

inertia is the tendency for motion to remain unchanged.
they can find inertia via f=m*a

Question 20

topic 1
newtons third law?

Answer 20

when two force interact, the force they exert on each other are equal and opposite.

Question 21

topic 1
if forces are always equal, how does anything move?

Answer 21

the forces are acting on different object.

Question 22

topic 1
what is not newtons third law?

Answer 22

two types of forces acting on one object. weight and normal contact force.

Question 23

topic 1
investigating motion practical.
pg 28

Answer 23

adding mass to the trolley increases the mass of the system whilst the force due to gravity acting on hanging hook stays the same. this means that mass is inversely proptional to acceleration of the system due to acceleration being slower due to increase in mass but fixed force.
adding mass to the hook changes the force. this increases accelerating force without changing the mass of the whole system thus force is directly proportional as it increase acceleration.

Question 24

what is mass?

Answer 24

the amount of matter in an object.

Question 25

weight

Answer 25

force acting on an object due to gravity.

Question 26

momentum

Answer 26

how much oomph an object has.
p=m*v