motion

Question 1

speed is

Answer 1

distance travelled per unit of time

Question 2

average speed is

Answer 2

speed measured over a relatively long period of time

Question 3

average spped equation

Answer 3

Question 4

Answer 4

Question 5

istantenous speed is

Answer 5

spped measured over an extremely short period of time

Question 6

speed symbol

unit

Answer 6

v or u

m/s

Question 7

distance symbol

unit

Answer 7

d metres (m)

Question 8

time symbol and units

Answer 8

seconds t

Question 9

time, speed, distance related by formula

Answer 9

d=vt

Question 10

Velocity and speed differences

Answer 10

Velocity includes a direction (the direction of travel) as well as its value (its magnitude). vector

scalar speed only magnitude

Question 11

velocity is

Answer 11

speed in a particular direction

Question 12

Two objects can have equal speeds but might have opposite (if they are travelling in).

Answer 12

velocities

opposite directions

Question 13

Acceleration is

Answer 13

the rate of change of velocity

how much the velocity of an object changes by every second.

Question 14

Acceleration equation

Answer 14

Question 15

acceleration units and symbol

Answer 15

a m/s2

Question 16

Answer 16

Question 17

maximum acceleration found by

Answer 17

choosing the part of the graph with the steepest gradient and calculating the gradient

Question 18

A distance time graph shows how

Answer 18

the distance of an object (from a point) varies over time:

Question 19

A horizontal line means

Answer 19

stationary, not moving

Question 20

A straight line means

Answer 20

constant speed.

Question 21

If the gradient increases

Answer 21

the object is speeding up (accelerating).

Question 22

If the gradient decreases the object is

Answer 22

slowing down (decelerating).

Question 23

If the line is going down, t

Answer 23

the object is moving backwards.

Question 24

Answer 24

Question 25

The speed of an object is given by the in a distance time graph

Answer 25

gradient of the line.

Question 26

Calculating Speed in a time-distance graph

Answer 26

Question 27

Answer 27

Question 28

Distance-time graphs are also known as

Answer 28

position-time graphs or displacement-time graphs

Question 29

spped time graphs also known as

Answer 29

velocity-time graphs

Question 31

A velocity-time graph shows how

Answer 31

the velocity (or speed) of an object changes over time.

Question 32

If the line is horizontal, the velocity or speed is

Answer 32

constant (no acceleration). v=0

Question 33

If the line slopes upwards then the object is

Answer 33

accelerating (speeding up). constant

Question 34

If the line goes down then the object

Answer 34

is decelerating (slowing down).

Question 35

Answer 35

Question 36

The distance travelled by an object can be found by

Answer 36

determining the area beneath the graph.

Question 37

Answer 37

Question 38

If the area beneath the graph forms a triangle (the object is accelerating or decelerating) then the area can be determined using the formula:

Answer 38

area = 1/2 x base x height

Question 39

If the area beneath the graph is a rectangle (constant velocity) then the area can be determined using the formula:

Answer 39

area = base x height

Question 40

Answer 40

Question 41

The acceleration of an object is given by the gradient of the graph:

Answer 41

Question 42

Lines that slope downwards have

Answer 42

negative gradients and so can be said to have negative accelerations: This is the same thing as a deceleration.

Question 43

If the gradient of the line changes then the acceleration of the body must be changing:

Answer 43

A line with constant gradient represents constant acceleration (linear motion). A curved line represents changing acceleration – either decreasing (if the gradient gets smaller) or increasing (if the gradient gets large).

Question 44

Answer 44

Question 45

DO QUESTION ON PAGE 11 IGCSE PHYSICS EXPLAINED AND SEE HOW IT WENT THERE

Question 46

V= when the initial speed is zero, formula can be expressed as v=

Answer 46

u+at at

Question 47

do problem page 13

Question 48

do problem page 14

Question 49

In the absence of air resistance, all objects fall with ...regardless of

Answer 49

he same acceleration, their mass.

Question 50

This acceleration is equal to the... approximately So long as air resistance remains insignificant, the speed of a falling object will

Answer 50

gravitational field strength 10 m/s2 near the Earth’s surface. increase at a steady rate, getting larger the longer it falls for.

Question 51

in free fall, there is... acceleration

Answer 51

constant

Question 52

when a object is dropped from an height and falls to the ground, the force acting on it causes it to fall is the ....

Answer 52

force due to gravity

Question 53

When a parachutist jumps out of an aeroplane, two main forces act:

Answer 53

Weight (the force of gravity) Air resistance

Question 54

Answer 54

Question 55

describe free fall page 20

Answer 55

Initially the air resistance is very small. There is a downwards unbalanced force and the skydiver accelerates. As the skydiver speeds up, the air resistance increases. Eventually the air resistance balances the weight and so the skydiver travels at a constant speed – terminal velocity. When the parachute is opened the increased air resistance on the parachute creates an upwards unbalanced force, making the parachute slow down.

Question 57

Answer 57

Question 58

Answer 58

Question 59

an object thrown upwards decelerates at

Answer 59

10 m/s2

Question 60

if there is sufficent air resistance, then the object's acceleration starts at 10 m/s2 and then decrease to.. velocity becomes called

Answer 60

zero constant terminal velocity

Question 61

if a student drops two objects of different masses frokm the leaning tower, objects accelerate at ... and ...

Answer 61

10m/s2 hit the ground at the same time provided air resistance is negligible

Question 62

if the student dropped a rock and a feather at the same time , feather would...

Answer 62

be more affected by air resistance and quickly reach termianl velocity