1 Motion

Question 1

Average speed equation

Answer 1

Average speed = total distance / total time

Question 2

Average acceleration equation

Answer 2

Average acceleration = change in velocity / time taken
a = (v - u) / t

Question 3

On a distance-time graph, the gradient of the line is numerically equal to …

Answer 3

the speed

Question 4

On a speed-time graph, the gradient of the line is numerically equal to …

Answer 4

the acceleration

Question 5

On a speed-time graph, the area under the line is numerically equal to …

Answer 5

the distance traveled

Question 6

Velocity vs. Speed

Answer 6

Speed is the rate of distance covered. It is scalar.
Velocity is speed in a particular direction. It is vector.

Question 7

If no external force is acting on it, an object will … (2)

Answer 7

If stationary, remain stationary
If moving, keep moving at a steady speed in a straight line

Question 8

Speed-time graph for an object at rest

Answer 8

Line at zero, along the x-axis (y-axis is speed)

Question 9

Speed-time graph for an object with a constant speed

Answer 9

Horizontal line (y-axis is speed)

Question 10

Speed-time graph for an object with changing speed

Answer 10

A line that moves up or down (y-axis is speed)

Question 11

A micrometer screw gauge is used to measure …

Answer 11

very small distances

Question 12

Vector quantities

Answer 12

Magnitude and direction are both required to define the quantity

Question 13

Scalar quantities

Answer 13

Quantities that can be defined with magnitudes only

Question 14

Retardation

Answer 14

Deceleration: it is negative acceleration, or slowing down

Question 15

Displacement vs Distance

Answer 15

Displacement is distance in a single direction. It is vector.
Distance is the path taken irrespective of the direction. It is scalar.

Question 16

The acceleration of free fall (g) near to the Earth is …

Answer 16

constant

Question 17

Force

Answer 17

a push or a pull, exerted by one object on another: it has direction as well as magnitude, so it is a vector

Question 18

Force SI units

Answer 18

Newtons (N)

Question 19

Mass SI units

Answer 19

Kilograms (kg)

Question 20

Acceleration SI units

Answer 20

Metres per second squared (m/s²)

Question 21

Inertia

Answer 21

Resistance to change in velocity
More mass –> more inertia

Question 22

Unbalanced forces are equivalent to a single force, called the …

Answer 22

resultant force

Question 23

Define the newton (1 newton is equal to …)

Answer 23

1 newton is the force required to give a mass of 1 kilogram an acceleration of 1 metre per second squared

Question 24

Static friction vs Dynamic friction

Answer 24

Static friction > Dynamic friction
Starting friction > Moving friction

Question 25

Gravitational force main features (3)

Answer 25

All masses attract each other The greater the masses, the stronger the force The closer the masses, the stronger the force

Question 26

Weight equation

Answer 26

Weight = mass x gravity W = mg

Question 27

To every action there is an ...

Answer 27

equal but opposite reaction

Question 28

Vectors and the parallelogram rule (3 steps)

Answer 28

1. From 0, draw two lines to represent the vectors: the direction and length of each line must be in proportion to the magnitude of each 2. Draw in 2 more lines to complete the parallelogram 3. Draw in the diagonal from 0: it represents the resultant magnitude and direction

Question 29

Centripetal force

Answer 29

the inward force needed to make an object move in a circle

Question 30

More centripetal force is needed if ... (3)

Answer 30

the mass of the object is increased the speed of the object is increased the radius of the circle is reduced

Question 31

Mass vs Weight

Answer 31

Mass is the quantity of matter in a substance Weight is the force exerted on an object in a gravitational field due to its mass

Question 32

The Earth is the source of a ...

Answer 32

gravitational field

Question 33

Gravitational force SI unit

Answer 33

N / kg

Question 34

Density equation

Answer 34

density = mass / volume p = m / V

Question 35

Forces may change the ____, _____ and ______ of a body

Answer 35

size, shape, motion

Question 36

Hooke's law

Answer 36

If the extension is proportional to the load beneath its elastic limit, an object obeys Hooke's law

Question 37

Equation involving spring constant

Answer 37

load = spring constant x extension F = kx

Question 38

Friction

Answer 38

the force between two surfaces which impedes motion and results in heating

Question 39

Air resistance is a form of ...

Answer 39

friction

Question 40

Resultant force of scalar quantities calculated by ...

Answer 40

addition (and/or subtraction)

Question 41

If there is no resultant force on a body, it either ...

Answer 41

remains at rest or continues at a constant speed in a straight line

Question 42

Pressure equation

Answer 42

Pressure = force / area p = F / A

Question 43

Moment of a force

Answer 43

a measure of its turning effect

Question 44

Moment equation

Answer 44

Moment = product force x perpendicular distance from the pivot

Question 45

Principle of moments: if an object is in equilibrium ...

Answer 45

the sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about that point

Question 46

When there is no resultant force and no resultant turning effect, a system is in ...

Answer 46

equilibrium