physics term 1 [exam]

Question 1

define scalar quantities

Answer 1

a quantity that has size but not direction

Question 2

define vector quantities

Answer 2

a quantity that has size and direction

Question 3

What are the two quantities

Answer 3

scalar and vector

Question 4

how do you convert from m/s to km/h?

Answer 4

x 3.6

Question 5

how do you convert from km/h to m/s?

Answer 5

÷ 3.6

Question 6

how do you go up in conversions (mm –> km)

Answer 6

÷10, ÷100, ÷1000

Question 7

how do you go down in conversions (km –> mm)

Answer 7

x 10, x 100, x 1000

Question 8

define distance (d)

Answer 8

how far an object travels in total (Scalar quantity)

Question 9

define displacement (s)

Answer 9

the straight line distance between the starting and finishing points (Vector quantity)

Question 10

What are the characteristics of speed

Answer 10

scalar
m/s or ms-1 km/h or kmh-1
symbol = Vav

Question 11

What are the characteristics of velocity

Answer 11

vector
m/s or ms-1 km/h or kmh-1
symbol = Vav

Question 12

define acceleration

Answer 12

change in velocity/speed (rate)
if an object is changing its speed or direction it is the acceleration
acceleration is larger when the change in speed happens over less time

Question 13

how do you find the acceleration

Answer 13

final velocity - initial velocity ÷ time

Question 14

how do you find the speed

Answer 14

distance traveled ÷ time

Question 15

how do you find the velocity

Answer 15

displacement ÷ time

Question 16

what causes acceleration

Answer 16

unbalanced forces acting on an object will result in acceleration

Question 17

What is newtons first law of motion

Answer 17

known as the law of inertia,
moving objects keep moving
objects in rest stay at rest
unless acted on by unbalanced force

Question 18

What is newtons second law of motion

Answer 18

expressed as F=ma
more force means more acceleration
more mass means less acceleration

Question 19

What is Newton’s third law of motion

Answer 19

known as action-reaction

if an object exerts a force on another object –> the 2nd exerts equal and opposite force on the 1st

Question 20

how to find force

Answer 20

f = ma

m - mass in kg
a - acceleration in m.s-1

larger acceleration –> larger force

Question 21

What is the law of conservation of energy?

Answer 21

Energy cannot be created or destroyed, only transferred or transformed.

Question 22

What is an example of the law of conservation of energy

Answer 22

When playing pool, the cue ball is shot at a stationary 8 ball. The cue ball has energy. When the cue ball hits the 8 ball, the energy transfers from the cue ball to the 8 ball, sending the 8 ball into motion. The cue ball loses energy because the energy it had has been transferred to the 8 ball, so the cue ball slows down.

Question 23

how do u find average velocity

Answer 23

final velocity + initial velocity ÷ 2