Measurements
Accuracy is ?
Accuracy is defined as the closeness of a value to the true and accepted value.
Define a force
Force is a push, pull or twist that can alter the shape, size, direction and motion of an object.
This is the point at which an elastic system no longer obeys Hooke's Law
Elastic limit
List 3 common lab equipment used in physics
Vernier Caliper
Micrometer Screw Gauge
Triple beam balance
What is the unit for moments of a force
Nm
Give the following number in its correct scientific notation. 0.00000567
5.67 x 10 -6
What are the two categories of forces
Applied and Non -contact Force
The gradient of a Force vs Extension graph tells us ________
Spring constant
View the picture and give the reading on the vernier caliper
4.27
State the Equation for calculating the moment of a Force
M = F x d
How many Fundamental quantities are there ?
seven
If the forces acting on an object are balanced the object will
Not move
What is the Formula for Calculating the spring constant of a spring?
F= Kx
where K = F/ x
View the picture for the micrometre screw gauge and tell the readings
5.83
What is moments?
Moment of a force is the product of the force x the perpendicular distance from the force to the pivot
List 4 Derived Quantities
Force
Density
Speed
Moments
In a tug of war game Team A pulls to the right with a force of 100 N and Team B pulls to the left with a force of 150 N. What is the resultant force and in which direction will the loser fall?
50 N to the left
If a System obeys Hooke's law and the Force applied is doubled what will happen to the extension ?
The extension will double
Look on the image and state the mass of the rock.
354.6
State the principle of moments
The principle of moments state that the sum of the Clockwise moments is equal to the sum of the anti clockwise moments
List ALL the Fundamental Quantities
Time
Mass
Length
Temperature
Current
Amount of Substance'
Luminous Intensity
State two ways in which can increase friction
Increase surface area
Weight of object increases
The velocity of the moving object increases
Calculate the Extension of a spring with a spring constant of 200 N/m and a force of 50 N.
F = k x
x = F/k
0.25 m
Vernier caliper helps in measuring
a external diameter
b internal diameter
c thickness and depth of narrow tubes
d all of them
All of them
The moment of a force is 24 Ncm. What size is the force if it acts 8 cm from the pivot?
3 N