motion

Question 1

what is displacement?

Answer 1

distance in a given direction. distance moved in a straight line from point a to point b in a specific direction.

Question 2

what is speed?

Answer 2

change of distance per unit of time, how fast an object is moving?

Question 3

what is velocity?

Answer 3

change of displacement per unit of time, speed in a given direction.

Question 4

when speed is constant what does it mean for distance and time?

Answer 4

an object moving at a constant speed travels equal distances in equal time.

Question 5

equation to calculate constant speed?

Answer 5

speed = distance/time

Question 6

speed for an object moving at constant speed on a circle of radius R

Answer 6

v = 2 pi r / T

Question 7

what are the 2 types of speed cameras

Answer 7

1. measures speed as vehicle passes the camera
2. linked to second speed camera and computer, which works out average speed of the vehicle between 2 cameras

Question 8

average speed

Answer 8

average speed = s / t

Question 9

instantaneous speed

Answer 9

instantaneous speed = change in s / change in t

Question 10

what will graph of object moving at constant speed look like~?

Answer 10

straight line graph

Question 11

what will graph of object moving at changing speed look like?

Answer 11

a curve

Question 12

how to find gradient of a graph for an object with changing speed

Answer 12

draw a tangent at a point, and then measuring the gradient (change in y/change in x)

Question 13

what is acceleration

Answer 13

change of velocity per unit time

Question 14

if velocity is constant what is the acceleration

Answer 14

zero

Question 15

what is uniform acceleration

Answer 15

velocity of an object moving along a straight line changes at a constant rate, acceleration is constant.

Question 16

equation for acceleration

Answer 16

change in velocity / time ( v-u/t)

Question 17

what is non uniform acceleration

Answer 17

direction of motion changes or speed changes at a varying rate,

Question 18

on a velocity time graph what is the acceleration

Answer 18

acceleration at any point is the gradient of the tangent to the curve at that point (height/base) or (change in y/ change in x)

Question 19

gradient of velocity time graph

Answer 19

acceleration

Question 20

when can you use suvat equations

Answer 20

constant acceleration

Question 21

what does suvat stand for

Answer 21

s - displacement
u - initial velocity
v - final velocity
a - accleration
t - time

Question 22

what are the 4 forces on an inclined plane?

Answer 22

reaction force, weight, pull force and friction force

Question 23

what is the speed for an object moving at a constant speed on a circle of radius?

Answer 23

v = 2πr/T

T- time to move round once
2πr - circumference of the circle

Question 24

what is the equation for average speed?

Answer 24

distance/time

Question 25

what does constant velocity mean?

Answer 25

An object moving at constant velocity moves at the same speed without changing its direction of motion

if an object changes its direction of motion or its speed or both - its velocity changes

Question 26

how do you find displacement in velocity time graph?

Answer 26

displacement is represented on the graph by area under