motions and forces - topic 1

Question 1

how do to calculate speed

Answer 1

distance/ time

Question 2

how to calculate acceleration

Answer 2

change in velocity /time take

Question 3

scalar

Answer 3

magnitude but no direction

Question 4

vector

Answer 4

magnitude and direction

Question 5

examples of scalar quantities

Answer 5

distance, mass, energy, time, speed

Question 6

examples of vector quantities

Answer 6

force, displacement, acceleration, weight, momentum, velocity

Question 7

speed of a person walking

Answer 7

1.5m/s

Question 8

speed of a person running

Answer 8

3m/s

Question 9

speed of a person cycling

Answer 9

6m/s

Question 10

wind speed

Answer 10

5-20m/s

Question 11

speed of sound in air

Answer 11

340m/s

Question 12

what does gradient mean in distance/time graphs

Answer 12

speed

Question 13

what does straight uphill sections mean in distance/time graphs

Answer 13

travelling at steady speed

Question 14

what does steepness mean in distance/time graphs

Answer 14

the steeper, the faster

Question 15

what does flat sections mean in distance/time graphs

Answer 15

it is stationary

Question 16

what does curves mean in distance/time graphs

Answer 16

acceleration or deceleration

Question 17

what happens if the resultant force on a stationary object is zero

Answer 17

if the resultant force on a stationary object is zero, the object will remain stationary

Question 18

what happens if the resultant force on a moving object is zero

Answer 18

if the resultant force on a moving object is zero, it will just carry on moving at the same velocity

Question 19

what happens if the resultant force on a moving object is non- zero

Answer 19

it’s velocity will change

Question 20

what does Newton’s Second Law say

Answer 20

the larger the force acting on an object, the more it accelerates AND acceleration is inversely proportional to the mass of an object

Question 21

equation for force and newtons second law

Answer 21

force = mass x acceleration

Question 22

centripetal force

Answer 22

resultant force acting towards the centre of a circle

Question 23

what is inertial mass

Answer 23

ratio of force over acceleration ( and is a measure of how difficult it is to change the velocity of an object)

Question 24

equation for newtons second law

Answer 24

force = mass x acceleration

Question 25

effects of gravitational force

Answer 25

makes things accelerate to the ground and it gives everything a weight

Question 26

what is weight

Answer 26

force acting on an object due to gravity

Question 27

equation for weight

Answer 27

mass x gravitational field strength

Question 28

how to measure weight

Answer 28

with a newton metre

Question 29

what is Newton's Third Law

Answer 29

when two objects interact, the exert equal but opposite forces of the same type on each other

Question 30

what is momentum

Answer 30

it is a property of moving objects. The greater the mass of an object and velocity, the greater its momentum

Question 31

what is the equation for force (2)

Answer 31

change in momentum / time

Question 32

what is the equation for stopping distance

Answer 32

thinking distance + braking distance

Question 33

what is thinking distance

Answer 33

distance the vehicle travels during the driver's reaction time

Question 34

what is braking distance

Answer 34

distance the vehicle travels after brakes are applied until it comes to a complete stop

Question 35

what affects thinking distance

Answer 35

speed of vehicle and how quick your response is

Question 36

what is acceleration

Answer 36

how quickly the velocity is changing

Question 37

how to calculate acceleration

Answer 37

change in velocity / time taken

Question 38

what is uniform acceleration

Answer 38

constant acceleration

Question 39

how to calculate uniform acceleration

Answer 39

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

Question 40

in a distance/time graph, what does a steepening curve mean

Answer 40

it's accelerating

Question 41

in a distance/time graph, what does a levelling off curve mean

Answer 41

it's decelerating

Question 42

what does the gradient in a velocity/time graph represent

Answer 42

acceleration

Question 43

what does flat sections in a velocity/time graph represent

Answer 43

steady speed

Question 44

what does steepness represent in a velocity/time graph represent

Answer 44

the greater the acceleration or deceleration

Question 45

what does a curve represent in a velocity/time graph represent

Answer 45

changing acceleration

Question 46

how to calculate distance from a velocity/time graph

Answer 46

the area under the graph in that interval

Question 47

what does Newton's first law say

Answer 47

a resultant force is needed to change the motion of an object

Question 48

to go at a steady velocity, what has to happen to the resultant force ?

Answer 48

there must be zero resultant force

Question 49

what happens if there is a non-zero resultant force on an object

Answer 49

it's velocity will change and will accelerate in the direction of the force

Question 50

inertial mass =

Answer 50

Force / acceleration

Question 51

what is inertia

Answer 51

the tendency to continue moving at the same velocity

Question 52

how to measure an objects weight

Answer 52

secure newton meter so it hangs downwards and attach the item you want to weight to the hook and weight until object is still to read weight off the scale on the newton meter

Question 53

momentum =

Answer 53

mass x velocity

Question 54

what is the conservation of momentum

Answer 54

in a closed system, the total momentum before an event is the same as after an event

Question 55

what affects braking distance

Answer 55

how fast you are going mass of the vehicle how good your brakes are amount of friction between tyres and road