test 1

Question 1

A ruler (rule) is used to measure

Answer 1

the length of an object between 1mm and 1m.

Question 2

The volume of an object of irregular shape can be measured by

Answer 2

placing it into a measuring
cylinder full of water. This causes the water level to rise, and this rise is equal to the volume
of the object.

Question 3

A micrometer screw gauge is used to measure

Answer 3

very small distances that a rule

cannot measure

Question 4

Analogue and digital clocks and devices are used to measure

Answer 4

Time intervals

Question 5

speed

Answer 5

distance traveled per unit time

Question 6

If speed of something is changing it is

Answer 6

accelerating (if increasing) or decelerating (if decreasing)

Question 7

Average speed =

Answer 7

total distance/ total time

Question 8

Distance is measured in

Answer 8

mm, cm, m or km

Question 9

time is measured in

Answer 9

ms, s, minutes or hours

Question 10

velocity

Answer 10

speed in a given direction

Question 11

acceleration

Answer 11

rate of change of velocity

Question 12

Acceleration =

Answer 12

change in velocity/ time

Question 13

In a distance time graph the gradient is

Answer 13

velocity

Question 14

Negative gradient in a distance time graph is

Answer 14

returning to the starting point

Question 15

In a distance time graph a curved line means that the

Answer 15

velocity is changing

and it is accelerating.

Question 16

in a speed time graph the gradient is

Answer 16

Acceleration

Question 17

negative gradient is

Answer 17

Deceleration

Question 18

if the speed is zero it is

Answer 18

At rest

Question 19

a horizontal line means

Answer 19

Constant speed

Question 20

a curved line means

Answer 20

The acceleration is changing

Question 21

mass is a measure of

Answer 21

how much matter is in an object

Question 22

Weight is a

Answer 22

gravitational force measured in newtons

Question 23

the gravitational field strength on earth is

Answer 23

10Nkg

Question 24

Weights (and hence masses) can be compared using

Answer 24

A balance

Question 25

Density

Answer 25

mass per unit volume

Question 26

density =

Answer 26

Mass/volume

Question 27

to find the density of a liquid

Answer 27

Find the mass of the measuring cylinder by placing it on a balance, then fill it with the liquid and measure the new mass. The difference in masses is the mass of the liquid. The volume can be read from the cylinder and the density calculated using the equation.

Question 28

To find the density of a solid

Answer 28

Measure the mass of the solid by placing it on a balance. If the solid is regularly shaped, measure its dimensions using a ruler or other measuring tool and then use a mathematical formula to find the volume. If the solid is irregularly shaped, immerse it in water and measure the volume of the water displaced. This is the volume of the solid. Find the density using the equation.

Question 29

Newton’s first law states that an object has a constant velocity unless acted on by a

Answer 29

resultant force

Question 30

Newton’s second law states that

Answer 30

𝒇𝒐𝒓𝒄𝒆 = 𝒎𝒂𝒔𝒔 × 𝒂𝒄𝒄𝒆𝒍𝒆𝒓𝒂𝒕𝒊𝒐𝒏 𝑭 = 𝒎𝒂

Question 31

Newton’s third law states that

Answer 31

every action force has an equal and opposite reaction force. For example, the force of the Earth’s gravity on an object is equal and opposite to the force of the object’s gravity on the Earth.

Question 32

Friction is a

Answer 32

force between two surfaces which impedes motion and results in heating. Air resistance is a form of friction.

Question 33

elastic deformation

Answer 33

The object returns to its original shape when the load has been removed, an example being a spring being stretched under normal usage.

Question 34

Plastic deformation

Answer 34

The object does not return to its original shape when the load has been removed, an example being a spring that has been stretched too far.

Question 35

hookes law states that

Answer 35

for a spring, 𝐹 = 𝑘𝑥 where F is the force applied to the spring in 𝑁, k is the spring constant in 𝑁𝑚−1 , and x is the extension in M

Question 36

If elastic deformation is stretched to far it

Answer 36

wont go back to normal

Question 37

If plastic deformation is stretched to far

Answer 37

it will break

Question 38

The moment of a force is

Answer 38

a measure of its turning effect

Question 39

moment of a force =

Answer 39

Force x perpendicular distance moment = Fd

Question 40

The pivot point is

Answer 40

the point which the object can rotate about

Question 41

Equilibrium is when

Answer 41

there is no resultant force and it is balanced

Question 42

Centre of mass is

Answer 42

the point at which all mass is considered to act

Question 43

The wider a base is the

Answer 43

Harder it is for an object to topple over

Question 44

a vector has

Answer 44

Magnitude and direction

Question 45

a scalar has just

Answer 45

Magnitude

Question 46

Examples of vectors

Answer 46

displacement, velocity, acceleration

Question 47

Examples of scalars

Answer 47

Distance, speed, time

Question 48

vectors can be represented by

Answer 48

arrows

Question 49

Momentum

Answer 49

the product of mass and velocity

Question 50

Momentum =

Answer 50

mass x velocity p=mv

Question 51

Impulse

Answer 51

product of force and time

Question 52

impulse is equal to

Answer 52

change in momentum

Question 53

Impulse =

Answer 53

Ft = mv - mu

Question 54

Work done =

Answer 54

force x distance

Question 55

Equation for work

Answer 55

W = Fd

Question 56

Power is

Answer 56

rate at which energy is transferred or the rate at which work is done

Question 57

Power =

Answer 57

energy transferred/time

Question 58

Equation for power

Answer 58

p = E/t

Question 59

Effencincy =

Answer 59

useful output/total input