Forces and Motion

Question 0

What the equation for speed?

Answer 0

Distance divided by time

Question 1

What is the difference between speed and velocity?

Answer 1

Speed - how fast

Velocity - direction specified

Question 2

What is the equation for acceleration?

Answer 2

Change in velocity divided by time

Question 3

On a distance time graph what is the
Gradient
Flat section
Downhill
Curves

Answer 3

Speed
Stopped
Going back to starting point
Acceleration

Question 4

On a velocity time graph what is the 
Gradient
Flat section
Uphill
Downhill
Curve 
Area

Answer 4

Acceleration 
Steady speed
Acceleration 
Deceleration 
Changing acceleration 
Distance

Question 5

What is gravity?

Answer 5

The force attraction between all masses

Question 6

What is the difference between weight and mass?

Answer 6

Mass - amount of stuff

Weight - different in each planet, mass with gravity

Question 7

What is the equation of weight?

Answer 7

Mass x gravitational field strength

Question 8

What are the 7 types of force?

Answer 8

Gravity 
Reaction force 
Electrostatic force
Thrust, push or pull
Drag, air resistance, friction
Lift
Tension

Question 9

What does friction do?

Answer 9

Opposes motion of the object - slows down

Question 10

What 3 ways does friction occur?

Answer 10

Friction between solid surfaces gripping and sliding past each other
Resistance or drag from fluids

Question 11

Friction increases as the ………………….

Answer 11

Speed increase

Question 12

What is terminal velocity?

Answer 12

Maximum velocity

When the resistance force is equal to the accelerating force

Question 13

The terminal velocity depends on ……………..

Answer 13

Their shape and area

Question 14

What is the first law of motion?

Answer 14

If forces are balanced it will stay still unless moving and will stay the same velocity

Question 15

What is the second law of motion?

Answer 15

If there is a unbalanced force then the object will accelerate in that direction

Question 16

What is the equation for force?

Answer 16

Mass x acceleration

Question 17

What is the third law of motion?

Answer 17

If object A exerts a force on object B exerts the exact opposite force on object a
Momentum before collisions is equal to momentum after

Question 18

What is a vector and scalar quantity?give examples

Answer 18

Vector - size and direction , force velocity acceleration

Scalar - only size , speed, time, length

Question 19

What is thinking distance affected by?

Answer 19

How fast

Alcohol, tiredness, drugs

Question 20

What affects breaking distance?

Answer 20

How fast
Mass of be vehicle
Brakes
Grip

Question 21

What is the equation for momentum?

Answer 21

Mass x velocity

Question 22

Momentum before =

Answer 22

Momentum after

Question 23

What is the equation of force acting?

Answer 23

Change in momentum divided by time taken for change

Question 24

What is the equation for moments?

Answer 24

Moment=force x perpendicular distance from pivot

Question 25

Where does the centre of gravity hang?

Answer 25

Directly below the point of suspension

Question 26

If a object is balanced Total anti-clockwise moments =

Answer 26

Total clockwise moments

Question 27

If the moments are not equal there will be

Answer 27

A resultant force

Question 28

What is hookes law?

Answer 28

Extension is proportional to force

Question 29

What is the length of an I stretched metal wire called?

Answer 29

Natural length

Question 30

When does hookes law stop working?

Answer 30

When the force is great enough

Question 31

What is the universe?

Answer 31

A large collection of billions of galaxies

Question 32

What causes orbit?

Answer 32

Gravity

Question 33

How do comets orbit the sun?

Answer 33

Elliptical with sun at the focus

Question 34

When does a comet travel faster?

Answer 34

By the sun

Question 35

What are the different types of forces?

Answer 35

``` Gravitational Reaction Electrostatic Thrust (push / pull) Lift Tension Air resistance Water resistance ```

Question 36

What is the difference between vector and scalar quantities?

Answer 36

A scalar has a magnitude of size only e.g. Speed 10m/s A vector has a magnitude of size and direction e.g. Velocity 10m/s East / force 50N left

Question 37

Is force a vector or scalar quantity?

Answer 37

Vector

Question 38

What is friction?

Answer 38

A force that opposes motion

Question 39

What is the equation for the relationship between force, mass and acceleration?

Answer 39

Force = mass x acceleration

Question 40

What is the equation for the relationship between speed, distance and time?

Answer 40

Speed = distance / time

Question 41

What is the equation for the relationship between acceleration, change in velocity and time?

Answer 41

Acceleration = change in velocity / time

Question 42

What is the equation for the relationship between momentum, mass and velocity?

Answer 42

Momentum = mass x velocity

Question 43

What is the equation for the relationship between moment, force and distance?

Answer 43

Moment = force x perpendicular distance to pivot

Question 44

What is the area under a distance time graph? IGNORE

Answer 44

The speed