forces

Question 1

what is a force?

Answer 1

a push or pull on an object due to an interaction with another object

Question 2

what is a vector quantity?

Answer 2

a quantity with both direction and magnitude

Question 3

what is a scalar quantity?

Answer 3

a quantity which only has magnitude

Question 4

what does it mean for an object to be in equilibrium?

Answer 4

it has no resultant force

Question 5

compare inelastic and elastic deformation

Answer 5

elastic- object returns to original shape
inelastic- object doesnt return to original shape

Question 6

what is the spring constant?

Answer 6

a measure of how much force would be requried to stretch or compress an object by 1m

Question 7

what is the resultant force?

Answer 7

the overall force acting upon an object

Question 8

what is the rule for drawning scale diagrams?

Answer 8

tip to tail on the arrows

Question 9

what does it mean when an object has been deformed?

Answer 9

it has changed shape

Question 10

what is extension?

Answer 10

the increase in length of a spring when it has been stretched

Question 11

what is hookes law?

Answer 11

the extension of a spring is proportional to the force upon it

only works until the elastic limit

Question 12

What is the minimum number of forces required to stretch, compress, or bend an object?

Answer 12

2

Question 13

what is the elastic limit?

Answer 13

the maximum extension of an object before it will deform inelastically

Question 14

what is a moment?

Answer 14

the rotational or turning effect of a force

Question 15

in terms of moments, what is distance measured in?

Answer 15

metres
e.g 20cm from pivot = 0.2m

Question 16

what is the unit for moments?

Answer 16

Nm

Question 17

what is the role of levers?

Answer 17

to transmit the turning effect of a force

small input force= large output force as output is closer to pivot

Question 18

what is the role of gears?

Answer 18

to transmit turning effects

Question 19

what is pressure?

Answer 19

the force per unit of area

Question 20

what unit is pressure meaured in?

Answer 20

Pa, not kPa (need to convert)

Question 21

what is upthrust?

Answer 21

when a resultant force is upwards

Question 22

why would an object sink?

Answer 22

if it more dense than the liquid it is in

Question 23

what happens to atmospheric pressure the further from earths surface you go?

Answer 23

it decreases as they weight of above gas particles decreases

Question 24

what is acceleration?

Answer 24

the rate of change in velocity

Question 25

what is terminal velocity?

Answer 25

an objects maximum velocity due to no resultant force

Question 26

what does the size of air resistance depend on?

Answer 26

1. surface area
2. velocity

Question 27

what is newtons 1st law?

Answer 27

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

Question 28

what is newtons second law?

Answer 28

if an object has a resultant force, it will accelerate
and
the size of the reultant force is directly proportional to the acceleration it causes

Question 29

what is inertia?

Answer 29

the tendancy for the motion of an object to remained unchanged

Question 30

what is newtons 1st law?

Answer 30

when 2 objects interact, the forces they exert onto eachother are equal and opposite

known as the normal contact force

Question 31

what does the conservation of momentum principle state?

Answer 31

the total momentum before a collision is equal to the total momentum after the collision