p9-motion

Question 1

what is the equation for speed

Answer 1

speed=distance/time

Question 2

what does the gradient of the line on a distance time graph represent

Answer 2

speed

Question 3

what does a horizontal line mean on a distance time graph

Answer 3

the object is stationary so speed is 0

Question 4

what does the line look like on a distance time graph when the object is travelling at a constant speed

Answer 4

a straight line that slopes upwards

Question 5

what does velocity mean

Answer 5

speed in a given direction

Question 6

if a car is travelling round a roundabout at a constant speed is there constant velocity

Answer 6

no

Question 7

what does displacement mean

Answer 7

distance travelled in a given direction

Question 8

what is the equation for acceleration

Answer 8

acceleration(a)=change in velocity(V-U)(final velocity - initial velocity) / time(s)

Question 9

what is a vector quantity

Answer 9

something that has magnitude(size) as well as direction

Question 10

what is a scalar quantity

Answer 10

something that only has magnitude(size)

Question 11

is speed a scalar or vector quantity

Answer 11

scalar because it only has magnitude

Question 12

is velocity and displacement a scalar of vector quantity

Answer 12

vector because it has magnitude as well as direction

Question 13

what is the unit of acceleration

Answer 13

m/s squared

Question 14

what does deceleration mean

Answer 14

when an object slows down

Question 15

what can a motion sensor that is linked to a computer do

Answer 15

record how the velocity of an object changes

Question 16

what does a straight line going up on a velocity time graph mean

Answer 16

the increase in velocity was the same every second, meaning that the acceleration is constant.

Question 17

what does a line going up show

Answer 17

the object is accelerating

Question 18

what does the gradient of the line of a velocity time graph give you

Answer 18

acceleration

Question 19

what does a straight line on a velocity time graph show

Answer 19

the velocity is constant

Question 20

what is the acceleration when there is a flat line an a velocity time graph

Answer 20

0 as the gradient is 0

Question 21

what happens when brakes are applied to a vehicle

Answer 21

it decelerates as the acceleration is negative

Question 22

what does the area under a flat line on a velocity time graph mean

Answer 22

distance

Question 23

how do you work out how far something has travelled while decelerating

Answer 23

the area of the triangle under the line

Question 24

what units must be used for speed or velocity before putting them on a graph or using them in an equation

Answer 24

m/s

Question 25

what does the line look like on a distance time graph for an object moving at a constant speed

Answer 25

straight line sloping upwards

Question 26

what does the gradient of the line on a distance time graph represent

Answer 26

speed

Question 27

how do you work out the gradient

Answer 27

height of triangle/base of triangle

Question 28

what does a curved line on a distance time graph mean

Answer 28

the speed is changing

Question 29

what is a tangent

Answer 29

a straight line that touches a point on the curve without cutting through the curve

Question 30

what does the gradient of the tangent tell you

Answer 30

the speed of the object at the moment the tangent touches the curve on the graph

Question 31

what is the formula average velocity

Answer 31

1/2 (u+v)

Question 32

what does v squared - u squared = 2as mean

Answer 32

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