P1A , P1B, P1C (physical quantities, motion & mass weight density)

Question 1

Average speed formula- why?

Answer 1

Total distance/Total time

becayse speed is not constant throughout

Question 2

Scalar

Answer 2

-Speed
-Distance
-Time

Question 3

Vector

Answer 3

-Velocity
-Displacement
-Accelaration

Question 4

Acceleration

Answer 4

Rate of change of velocity

Question 5

formula for acceleration

Answer 5

change in velocity/change in time

Question 6

what formula is used to calculate speed?

Answer 6

Speed= Distance/time

Question 7

Difference between speed and velocity

Answer 7

Speed is simply the rate at which an object covers a distance (scalar)

While Velocity measures speed in a specific direction. (vector)

Question 8

What does a minus or plus sign mean with velocity

Answer 8

• = Going the opposite direction
  + = moving in the positive direction. (right or up or left or down depends on the context)

Question 9

What does a straight line on a DT graph mean

Answer 9

That the object has paused

Question 10

What does a curve mean on a DT graph

Answer 10

acceleration

Question 11

what does diagonal straight incline mean on DT

Answer 11

Constant speed

Question 12

What is acceleration

Answer 12

Acceleration is the rate at which an object’s velocity changes over time.

Question 13

How is acceleration shown on a DT graph

Answer 13

A smooth curve

Question 14

how can acceleration be calculated

Answer 14

change in velocity/time taken

Question 15

Horizontal line on a VT graph

Answer 15

steady speed

Question 16

Straight diagonal line on a VT graph

Answer 16

steady acceleration

Question 17

Curve on a VT graph

Answer 17

A curve on a VT graph indicates changing acceleration

Question 18

How do you find distance from a VT graph

Answer 18

The area under a VT graph gives the distance because Distance =speed x time

(make sure unit is consistent)

Question 19

What happens when you drop an object

Answer 19

Gravity acts on the object and causes it to accelerate.

This acceleration of free fall g is constant for a body near the earth, acts downwards and has a value of approximately 9.8m/s^2

Question 20

unit for acceleration

Answer 20

m/s^2

Question 21

How can you tell from a distance time graph whether the object is moving away from you or toward you?

Answer 21

If the distance is increasing (the graph slopes upward), the object is moving away from you.

If the distance is decreasing (the graph slopes downward), the object is moving toward you.

Question 22

Acceleration

Answer 22

The rate (how quickly) of change of velocity.

Question 23

Acceleration formula

Answer 23

change in velocity/ time taken

a= (v-u)/t

v= final velocity in m/s
u= starting velocity in m/s
t= time taken s

Question 24

How do you calculate acceleration from a speed time graph

Answer 24

the gradient of a speed-time graph

Question 25

How do you find distance from a speed-time graph

Answer 25

the area beneath the graph *always make sure the units are consistent*

Question 26

What is the vector version of these: -speed -distance

Answer 26

-velocity -displacement

Question 27

What does a steep slope on a distance-time graph represent?

Answer 27

The object is moving quickly. The steeper the slope, the faster the object is moving.

Question 28

How can you determine the speed of an object from a distance-time graph?

Answer 28

Speed is the gradient (slope) of the line. A steeper slope means a higher speed.

Question 29

What does a curved line on a distance-time graph mean about the object’s motion?

Answer 29

The object’s speed is changing, meaning it's either accelerating or decelerating.

Question 30

What does a horizontal line on a velocity-time graph represent?

Answer 30

The object is moving at a constant velocity.

Question 31

What does a negative slope on a velocity-time graph suggest?

Answer 31

The object is decelerating (slowing down).

Question 32

What does a horizontal line on a velocity-time graph represent?

Answer 32

The object is moving at a constant velocity.

Question 33

Mass (scalar)

Answer 33

How much material is present in the object (g,kg etc.)

Question 34

Weight (vector)

Answer 34

force on the object due to gravity (N)

Question 35

velocity

Answer 35

rate of change of displacement (distance travelled) (m/s)

Question 36

Weight formula

Answer 36

m (mass) x g (gravitational field strength)

Question 37

gravitational field on earth

Answer 37

9.8

Question 38

mass is a property that _____ change in motion

Answer 38

resists

Question 39

how do you find the mass of something?

Answer 39

The most accurate way is with a balance. The balance is level when the forces pulling down both sides are the same.

Question 40

How do you find the weight of something?

Answer 40

A spring balance: -The top of the spring is hung from a hook -The scale can then be adjusted so that the pointer is aligned

Question 41

Gravity is an _____ , _______ force

Answer 41

attractive, non contact

Question 42

What is gravitational force

Answer 42

acceleration due to gravity

Question 43

why does a heavier object fall faster than a lighter object

Answer 43

due to air resistance or water resistance

Question 44

Terminal velocity

Answer 44

The constant speed that a falling object reaches because the force of gravity is balanced by air resistance.

Question 45

field strength

Answer 45

N/kg

Question 46

what is density

Answer 46

how much mass is in 1m^3 or 1cm^3 of an object

Question 47

formula for density

Answer 47

ρ=m/v. mass/volume.

Question 48

density of water

Answer 48

1g/cm^3

Question 49

what happens when the density of an object is less than the fluid

Answer 49

it floats

Question 50

what happens when the density of an object is more than the fluid

Answer 50

it sinks- upthrust is less than weight

Question 51

what happens when objects fall in a vacuum

Answer 51

there is no air resistance or liquid resistance so the only force acting on them is the force of weight.

Question 52

what is a vacuum

Answer 52

space that contains no matter

Question 53

force formula

Answer 53

mass x acceleration

Question 54

What is upthrust

Answer 54

the force that pushes upwards on an object submerged in a liquid.

Question 55

what direction does upthrust always act in

Answer 55

opposite direction to the object's weight force

Question 56

The ________ the object the _________ the upthrust

Answer 56

denser greater

Question 57

what does an object floating say about the upthrust

Answer 57

it is equal to the weight.

Question 58

what does the size of upthrust depend on

Answer 58

the density of the fluid The volume of fluid pushed aside (equal to the volume of the object)

Question 59

how do you calculate the density of a regularly shaped object

Answer 59

1. Measure the mass: Use a balance or scale to find the object's mass in kilograms (kg) or grams (g). 2. Find volume by finding length, width, height mass/volume

Question 60

how do you calculate the density of an irregularly shaped object

Answer 60

1. measure mass 2. measure volume- measure the original volume of water then 3. submerge the object in the water completely, ensuring it’s fully underwater 4.Measure the new water level. The increase in water level shows the volume of the object. Final water level - Initial water level 5. mass/volume

Question 61

what can be certain flaws in calculating the density of an irregularly shaped object

Answer 61

-The water level may not be read accurately. -The object might not be fully submerged, leading to incorrect displacement.

Question 62

what does resultant force= 0 look like on a vt graph

Answer 62

horizontal line- acceleration=0