Ch 17 Motion

Question 1

what is distance measured in

Answer 1

meters (m)

Question 2

what is speed measured in

Answer 2

meters per second (m/s)

Question 3

what is time measured in

Answer 3

seconds (s)

Question 4

what is the equation for speed

Answer 4

speed = distance divided by time

Question 5

what are scalar quantities

Answer 5

quantities that have a size

Question 6

what are vector quantities

Answer 6

quantities that have both magnitude and direction

Question 7

what are two vector quantities that control the motion of objects

Answer 7

displacement

velocity

Question 8

what is displacement

Answer 8

the distance an object travels in a certain direction

Question 9

what is velocity

Answer 9

the speed of an object and the direction it is traveling in

Question 10

what is the equation for velocity

Answer 10

displacement divided by time

Question 11

what does a distance time graph

Answer 11

a distance time graph shows the distance something travels over the time taken to travel that distance

Question 12

how do you calculate the slope

Answer 12

slope = change in speed divided by change in time = speed

Question 13

what is acceleration

Answer 13

when speed changes over time

Question 14

what is the formula for acceleration

Answer 14

change in speed (m/s) divided by time taken (s)

Question 15

what are contact forces and non contact forces

Answer 15

contact forces two objects have to be in contact

non contact forces two objects don’t have to be in contact

Question 16

give two examples of contact forces

Answer 16

friction, tension

Question 17

give two examples of non contact forces

Answer 17

magnetic force, gravity

Question 18

what is an interaction pair

Answer 18

forces that happen in a pair e.g. boy jumping off ground

Question 19

what does a network meter measure

Answer 19

forces

Question 20

what is a newton meter also known as

Answer 20

a spring balance

Question 21

what can forces also be measured digitally by

Answer 21

a force meter

Question 22

what is the si unit for force

Answer 22

the newton (N)

Question 23

what is equilibrium

Answer 23

the state of balance between opposing forces

Question 24

what is dynamic equilibrium

Answer 24

when the forces are equal but the object still moves e.g. skydiver falls at steady speed from the sky after opening a parachute

Question 25

what is friction

Answer 25

a force that opposes motion when two object are placed in contact

Question 26

what are two examples of drag forces

Answer 26

water and air resistance

Question 27

what is lubrication

Answer 27

it is used to reduce the friction between to solids e.g. oil and wax

Question 28

what is a reaction force

Answer 28

the force applied by an object in response to the weight of another object e.g. standing on a table

Question 29

what is an elastic object and give examples

Answer 29

any object that is able to restore its shape after being stretched or compressed e.g. springs, elastic bands

Question 30

what is elastic limit

Answer 30

the point where they will not restore their shape

Question 31

what is density

Answer 31

the ratio of mass to volume

Question 32

what is the formula for density

Answer 32

mass (kg) divided by volume (m3)

Question 33

what does archimedes principle state

Answer 33

it states that an object placed in water will feel an up thrust equal to the weight of the water displaced