Motion, forces and energy- topic 1

Question 1

how do you measure length

Answer 1

with a ruler or tape measure standard unit is metre sub divisions include
1m= 100cm
1m=1000m
1km= 1000m

Question 2

how do you measure volume

Answer 2

using a measuring cylinder, volume should be read from centre of the cylinder, bottom of miniscus, measure in liters L or cubic centimeters cmˆ3

Question 3

how do you measure time

Answer 3

using clocks or timers

Question 4

vectors

Answer 4

measurments with both magnitude and force, weight, velocity, acceleration, momentum, electric field strength and gravitational field strength

Question 5

scalars

Answer 5

measurments with only magnitude
distance, speed, time, mass, energy and
temperature

Question 6

how do you add vectors

Answer 6

if in the same direction, you simply add them together, if at right angles to each other, use Pythagoras theorem

Question 7

speed formula

Answer 7

distance (m)/ total time taken (s)
spedd= m/s

Question 8

velocity vs speed

Answer 8

velocity takes into account a specific direction, and final displacement
speed only takes into account magnitude not displacement.

Question 9

what do you call a object speeding up vs one slowing down

Answer 9

accelerating and deacelerating

Question 10

formula for acceleration

Answer 10

change in velocity (m/s) / time taken (s)
acceleration= m/sˆ2

Question 11

when do you write a negative acceleration

Answer 11

when object is slowing down

Question 12

describe distance time graphs

Answer 12

distance (y axis) vs time (x-axis)
graph has a straight diagonal line= constant speed
straight diagonal line which is steeper (has a higher gradient)= faster constant speed
flat horizontal line= not moving stationary
gradient= change in distance/ change in time= speed (gradient=speed) gradient= rise/run

Question 13

describe speed- time graphs

Answer 13

speed (y-axis) time (x-axis)
a flat horizontal line at zero speed = stationary
a flat horizontal line above zero speed = constant speed
an upward sloping line = accelerating; the steeper the gradient, the higher the acceleration
a downward sloping line = decelerating.
distance= area under the graph
straight line= constant acceleration
gradient= acceleration= change in speed/ change in time (rise/run)

Question 14

what is the value for acceleration of free fall for object near surface of earth

Answer 14

9.8 m/s ˆ2

Question 15

what happens to an object falling when no air resistance is present

Answer 15

object would accelerate until terminal velocity