Forces

Question 1

Define:

Vector

Answer 1

A quantity with both magnitude and direction

Question 2

List:

Vector Quanitities

Answer 2

Force
Velocity
Displacement
Acceleration
Momentum

Question 3

Define:

Scalar

Answer 3

A quantity with onlt magnitude and no direction

Question 4

List:

Scalar Quantities

Answer 4

Speed
Distance
Mass
Temperature
Time

Question 5

List:

Contact Forces

Answer 5

Friction
Air Resistance
Tension
Normal Contact Force

Question 6

List:

Non-contact Forces

Answer 6

Magnetism
Gravity
Electrostatic

Question 7

Equation:

Weight

Answer 7

W = mg

Question 8

Equation:

Work Done

Answer 8

W = Fs

Work = Force x Distance

Question 9

Equation:

Force on a Spring

Answer 9

F = ke

Force = Spring Constant x Extension

Question 10

Required Practical:

Force and Extension

Answer 10

1) Measure the natural length of the spring
2) Add a mass to the spring and allow it to come to rest. Record the mass and measure the new length of the spring. The extension is the change in length
3) Repeat this process until you have enough measurements
4) Plot a force-extension graph of your results

Question 11

Equation:

Elastic Potential Energy

Answer 11

Ee = ½ke²

Elastic Potential = ½ x spring constant x extension²

Question 12

Equation:

Moment

Answer 12

M = Fd

Question 13

Equation:

Pressure

Answer 13

P = F/A

Question 14

Equation:

Pressure of a Column of Liquid

Answer 14

P = hρg

Question 15

Equation:

Distance

Answer 15

s = vt

Distance = Speed x Time

Question 16

Define:

Speed

Answer 16

How fast an object is travelling with no regard to direction

Question 17

Define:

Velocity

Answer 17

How fast an object is moving in a direction

Question 18

Describe:

Walking Speed

Answer 18

1.5m/s

Question 19

Describe:

Running Speed

Answer 19

3m/s

Question 20

Describe:

Cycling Speed

Answer 20

6m/s

Question 21

Describe:

Average Car Speed

Answer 21

25m/s

Question 22

Describe:

Average Train Speed

Answer 22

30m/s

Question 23

Describe:

Average Plane Speed

Answer 23

250m/s

Question 24

Equation:

Acceleration

Answer 24

a = ∆v/t

Acceleration = Change in Velocity / Time

Question 25

# Equation: Uniform Velocity

Answer 25

v² - u² = 2as | Final Velocity² - Initial Velocity² = 2 x Acceleration x Distance

Question 26

# Define: Newton's First Law

Answer 26

A force is needed to change motion: If the resultant force on a stationary object is zero, the object will remain stationary. If the resultant force on a moving object is zero, it will carry on moving at the same velocity

Question 27

# Define: Newton's Second Law

Answer 27

Acceleration is proportional to the resultant force

Question 28

# Equation: Resultant Force

Answer 28

F = ma

Question 29

# Define: Newton's Third Law

Answer 29

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

Question 30

# Required Practical: Acceleration

Answer 30

1) Set up the trolley on the track holding a piece of card to interact with the light gates 2) Connect the trolley to a piece of string that goes over a pulley and is connected to a hook 3) Mark the start line for the trolley so it always travels the same distance 4) Place the trolley on the starting line and hold it so the string is taut 5) Record the acceleration measured by the light gate 6) Repeat this two more times to find an everage acceleration 7) Repeat the whole investigation with increasing masses to investigate the effect of mass on acceleration

Question 31

# Equation: Stopping Distance

Answer 31

Stopping Distance = Thinking Distance + Braking Distance

Question 32

# Equation: Momentum

Answer 32

p = mv | Momentum = Mass x Velocity

Question 33

# Equation: Change in Momentum

Answer 33

F = m∆v / ∆t | Force = Change in momentum / Change in time