physics - motion + forces

Question 1

what are scalars?

Answer 1

a quantity which only has magnitude (size)

Question 2

what are vectors?

Answer 2

a quantity which has magnitude + direction

Question 3

how is the average speed calculated?

Answer 3

total distance travelled / total time taken

Question 4

instantaneous speed what is it? (its a particular point..)

Answer 4

speed at a particular point in a journey

Question 5

in a graph what does it mean when there is a straight line?

Answer 5

that the object is stationary

Question 6

the steeper the lines the what?

Answer 6

the steeper the lines the faster the object is travelling

Question 7

what is deaccelaration?

Answer 7

then acceleration is a negative value

Question 8

how do you calculate acceleration?

Answer 8

change in velocity / time taken

Question 9

how do you calculate the final velocity?

Answer 9

final velocity - initial velocity = 2 x acceleration x distance

Question 10

what does mass mean?

Answer 10

quantity of matter there is in an object + only changes if the object itself changes

Question 11

on earth, how much is the gravitational field strength?

Answer 11

10 newtons

Question 12

whats newtons’ second law?

Answer 12

if a non-zero resultant force acts on an object, it will cause the object to accelerate

Question 13

what is newtons’ third law?

Answer 13

when 2 objects interact, the forces they exert on each other are equal + opposite

Question 14

what are the 2 main factors affecting weight?

Answer 14

1. an object’s mass
2. local gravitational field strength

Question 15

how do you calculate weight? (what is the formula)

Answer 15

weight = mass x gravitational field strength

Question 16

define the term energy

Answer 16

the ability to do work/cause change