UI Forces and Motion

Question 1

Average speed

Answer 1

total distance divided by total time

Question 2

Velocity

Answer 2

quantitative measure how quickly an object moves

Question 3

gradient

Answer 3

a value representing how much y value changes when the x
value changes by 1 unit

Question 4

Light gate

Answer 4

a digital sensor in timing experiments

Question 5

Initial speed

Answer 5

speed of an object before the acceleration

Question 6

Final speed

Answer 6

speed at the end

Question 7

Contact forces

Answer 7

a force that is applied by objects in contact with each other

Question 8

Non-contact forces

Answer 8

a force that is applied by objects not in contact with
each other

Question 9

Vector quantity

Answer 9

a quantity has both magnitude and direction

Question 10

Scalar quantity

Answer 10

a quantity has magnitude only

Question 11

weight

Answer 11

the force with which a body is attracted to Earth or another
celestial body

Question 12

tension

Answer 12

the force resulting from the stretching of an elastic body

Question 13

friction

Answer 13

the force due to rubbing of one body against another

Question 14

Resultant force

Answer 14

the combined force that is the sum of a set of forces

Question 15

stationary

Answer 15

fixed in a position

Question 16

Unbalanced forces

Answer 16

forces that are not in equilibrium

Question 17

Inversely proportional

Answer 17

y is proportional to 1/x

Question 18

Tone up muscles

Answer 18

firm up muscles

Question 19

Elastic deformation

Answer 19

deformation that disappears upon removal of the external forces

Question 20

Inelastic deformation

Answer 20

deformation that won’t disappear upon removal of the external

Question 21

extension

Answer 21

the difference between final length after extending and initial length

Question 22

Limit of proportionality

Answer 22

the point up to which the stress remains directly
proportional to strain

Question 23

momentum

Answer 23

product of mass and velocity of an object

Question 24

Change of momentum

Answer 24

final momentum minus initial momentum

Question 25

Crumple zones:

Question 26

Crumple zones

Answer 26

a section of an automobile body designed to absorb the
force of an impact in order to protect the passengers

Question 27

crash

Answer 27

breaking to pieces by collision

Question 28

collision

Answer 28

an encounter between objects

Question 29

Explosions

Answer 29

a rapid expanding or bursting

Question 30

Conservation of momentum

Answer 30

total momentum is not changed when no
external forces act upon