Foundations Flashcards
What is displacement
The size of the dinstance
What is the displacement when you travel from point A-B-C-A
0
What is the resultant of two or more vectors
The single vector that produces the same effect as all the vectors
If a system is in equilibrium what must the weight equal to
The sum of the vertical components
How does displacement of a particle give us more info than the distance travelled of prical
Displacement will tell us the distance travelled and also the direction of motion of particle
What quantity is pressure
Scalar
State what direction of the mass will travel if ball was hung from a string
Downwards
A diagram shows forces acting on a seat of a swig that are in equilibrium. What is the net force on the seat
0N the system is in equillibrium
A gardener rolls the grass and moves the roller at a steady speed . What is the net force in the horizontal direction?
0N as the roller is moving at constant speed
A stunt person is holding on top a rope in the air. This makes the rope on either side have an angle of 5 degrees to the horizontal. What would happen if this angle is made to be 0?
The tension in the rope will become infinite and therefore the rope will break
Using the rules of combining uncertainties, what should you do is the formula is in the form - AxB or A/B
Add the percentage uncertainties together
Using the rules of combining uncertainties, what should you do is the formula is in the form - A^2
Double the percentage uncertainty of A
Using the rules of combining uncertainties, what should you do is the formula is in the form - A^n
Multiply the percentage uncertainty by n
Using the rules of combining uncertainties, what should you do is the formula is in the form - A+b or A-B
Add the absolute uncertainty of A+B together
What is centripetal force?
A force that acts on a body in a circular path and is directed towards the centre around which the body is moving
A tourist is standing in a cubicle of the London eye. They have the weight force, normal contact force, and a horizontal force between them and the the ground. Explain why the horizontal force is necessary for centripetal force.
For circular motion there must always be a resultant force towards the centre, this can only provided by a frictional force and can not b provided by the vertical forces only. It needs both horizontal and vertical forces in order to have a resultant force.
What is electric potential
The amount of work needed to move a unit of charge from a reference point to a specific point against an electric field.
Equation for w1 or f1 the force acting down the slope ( parallel to slope)
W1= weight x sin(theta)
Equation for w2 acting against the slope (perpendicular to slope )
W2= weight x cos(theta)
How do you find uncertainty
Find the range and divide by 2
How do you find percentage uncertainty
Divide uncertainty by measured value and x 100
What is absolute uncertainty
The actual uncertainty given
