Physics: Forces

Question 1

What is a scalar quantity

Answer 1

something that only has magnitude

Question 2

what is a vector quantity

Answer 2

something that has magnitude and direction

Question 3

What is a contact force

Answer 3

Force that acts upon multiple objects when they are touching

Question 4

What is a non contact force

Answer 4

Force that acts upon an object when it isn’t touching another one

Question 5

What is the weight equation

Answer 5

W (Weight) = m (mass) x g (gravitational field strength)

Question 6

What is resultant force

Answer 6

The overall force acting on an object or point

Question 7

What is the resultant force/work done equation

Answer 7

W (work done/resultant force) = F (Force) x s (distance)

Question 8

What three things can happen to elastic objects that transfers energy

Answer 8

Stretching, Compressing, Bending

Question 9

What is the elastic force equation

Answer 9

F (Force) = k (spring constant) x e (extension)

Question 10

What is the Elastic Potential Energy equation

Answer 10

EPE = 0.5 x k (spring constant) x e2 (extension squared)

Question 11

What is a Moment

Answer 11

Turning effect of a force

Question 12

What is the moment equation

Answer 12

M (Moment) = F (force) x d (distance)

Question 13

How do levers work

Answer 13

Levers increase the distance from the pivot at which the force is applied making it easier to do work because less force is required

Question 14

What is a gear

Answer 14

Gears are circular discs with teeth around their edges that interlock so that turning one causes another to turn, in the opposite direction

Question 15

Why are gears used

Answer 15

Transmit the rotational effect of a force from one place to another

Question 16

How do gears work

Answer 16

Increase the distance between the pivot and the force which means a bigger gear can create a bigger moment but turns more slowly

Question 17

What is the pressure equation

Answer 17

p = F (force) / A (Area)

Question 18

What is the pressure in a liquid equation

Answer 18

p = h (height of column of liquid) x p (Greek letter rho density) x g (gravitational field strength)

Question 19

When does an object float

Answer 19

Weight = Upthrust

Question 20

How does height affect atmospheric pressure

Answer 20

Atmospheric pressure decreases with height

Question 21

What is the distance equation

Answer 21

s (distance) = v (speed) x t (time)

Question 22

what is the typical everyday speed of a person walking

Answer 22

1.5 m/s

Question 23

what is the typical everyday speed of a person running

Answer 23

3 m/s

Question 24

what is the typical everyday speed of a person cycling

Answer 24

5 m/s

Question 25

what is the typical everyday speed of a car

Answer 25

25 m/s

Question 26

what is the typical everyday speed of a train

Answer 26

55 m/s

Question 27

what is a typical everyday speed of a plane

Answer 27

250 m/s

Question 28

what is acceleration

Answer 28

How quickly you're speeding up

Question 29

what is the acceleration equation

Answer 29

a (acceleration) = /\v (change in velocity) / t (time)

Question 30

what is the constant acceleration equation

Answer 30

v2 (final velocity squared) - u2 (Initial velocity squared) = 2as (2 x acceleration x distance)

Question 31

what is the area of a distance time grpah

Answer 31

Speed

Question 32

what is the area of a velocity time graph

Answer 32

Acceleration

Question 33

what is terminal velocity

Answer 33

Highest velocity attainable by an object as it falls

Question 34

What is Newton's first law

Answer 34

resultant force is needed to make something start moving, speed up or slow down

Question 35

what is the resultant force equation

Answer 35

F (resultant force) = m (mass) x a (acceleration)

Question 36

what is inertia

Answer 36

tendency for motion to remain unchanged

Question 37

what is Newton's third law

Answer 37

when two objects interact, the forces they exert on each other are equal and opposite

Question 38

what is the stopping distance equation

Answer 38

stopping distance = thinking distance + breaking distance

Question 39

What two factors affect thinking distance

Answer 39

speed and reaction time

Question 40

what three factors affect breaking distance

Answer 40

speed, weather and condition

Question 41

what does speed affect more breaking distance or thinking distance

Answer 41

breaking distance

Question 42

what is the momentum equation

Answer 42

p (momentum) = m (mass) x v (velocity)

Question 43

what is the momentum force equation

Answer 43

F (force) = m/\v (change in momentum) / /\t (change in time)

Question 44

what three safety features do cars have to change momentum

Answer 44

crumple zones, seat belts stretch, air bags

Question 45

what safety feature do bike helmets have

Answer 45

contain a crushable layer