Topic 2 - Motion and Forces

Question 1

What is velocity?

Answer 1

Speed in a given direction.

Question 2

What is a scalar?

Answer 2

A quantity with only magnitude.

Question 3

Give three examples of scalars

Answer 3

Distance, speed, mass, energy…

Question 4

Give three examples of vectors

Answer 4

Displacement, velocity, acceleration, momentum, force…

Question 5

What is displacement?

Answer 5

The distance something is from its starting point.

Question 6

What is a vector?

Answer 6

A quantity with magnitude and direction.

Question 7

speed (s) =

Answer 7

distance(d)/time(t)

Question 8

velocity (v) =

Answer 8

displacement(d)/time(t)

Question 10

distance (d) =

Answer 10

speed(s)*time(t)

Question 11

Distance-Time Graphs (pg 14)

Answer 11

Make sure you can analyse them

Question 12

What measurement does the gradient of a distance-time graph show?

Answer 12

Speed

Question 14

acceleration (a) =

Answer 14

change in velocity(v-u)/time(t)

Question 15

What measurement does the gradient of a velocity-time graph show?

Answer 15

Acceleration

Question 16

How do you measure distance travelled with a velocity-time graph?

Answer 16

Use the area under the graph

Question 17

v^2 - u^2 =

Answer 17

2ax

Question 18

Light gate practical (pg 18)

Answer 18

Understand it

Question 19

What is average wind speed (in m/s)?

Answer 19

3-6 m/s

Question 20

What is the speed of sound (in m/s)?

Answer 20

About 340 m/s

Question 21

What is average walking speed (in m/s)?

Answer 21

1.5-2.5 m/s

Question 22

What is average running speed (in m/s)?

Answer 22

5-7 m/s

Question 23

What is average cycling speed (in m/s)?

Answer 23

5-8 m/s

Question 24

What is the value of g (to the nearest integer)?

Answer 24

10 m/s^2

Question 25

What is Newton’s first law?

Answer 25

An object will stay stationary or at a constant speed unless acted upon by unbalanced forces.

Question 26

In Newton’s second law, what are the two equations that define resultant force?

Answer 26

resultant force (F) = inertial mass(m)*acceleration(a) = change in momentum(mv-mu)/time(t)

Question 27

weight (W) =

Answer 27

mass(m)*gravitational field strength(g)

Question 28

Is an object moving in a circular orbit at constant speed changing velocity?

Answer 28

Yes

Question 29

Centripetal force (pg. 17)

Answer 29

Understand this

Question 30

What is inertial mass?

Answer 30

How difficult it is to change the velocity of an object.

Question 31

momentum (p) =

Answer 31

mass(m)*velocity(v)

Question 32

Momentum (pg 20)

Answer 32

Understand this

Question 33

What is a way of measuring reaction time?

Answer 33

The ruler drop experiment (pg. 22)

Question 34

stopping distance =

Answer 34

thinking distance + braking distance

Question 35

Name 3 factors that affect the stopping distance of a vehicle

Answer 35

mass of vehicle, speed of vehicle, driver’s reaction time, state of brakes, state of tires, friction between tire and road

Question 36

Name 2 factors that could affect a driver’s reaction time

Answer 36

Age, distractions, tiredness, sobriety

Question 37

inertial mass (m) =

Answer 37

force(F)/acceleration(a)

Question 38

Velocity-Time Graphs (pg 15)

Answer 38

Make sure you can analyse them

Question 39

What are typical stopping distances for vehicles going at 30mph, 50mph and 70mph?

Answer 39

30mph -> 23m
50mph -> 53m
70mph -> 96m

Question 40

What is the relationship between speed and braking distance?

Answer 40

Speed^2 is directly proportional to braking distance.