3.3.1 Work and the joel Flashcards
Where is the angle measured from in order to calculate the magnitude of the work done for a given force.
The direction of motion
What is the formulae for determining work done for a given force, angle, and direction of motion?
W = Fcosθ x d
Define “Work Done”
The product of the force and distance moved by the force in the direction of the movement
Work done: Scalar or Vector?
Scalar
What is the equation for vertical motion?
(W=Fd
F=mg)
W=mgh
Horizontal Force: 28N
Distance: 12m
Work done if no friction?
W=Fd
28x12=336J
Mass: 34kg
Raised 7.5m upwards
How much work has been done?
W=Fd F=mg
W=mgd
34 x 9.81 x 7.5 = 2500J
How would you increase the speed of a roller coaster by a factor of 2
increasing the height by a factor of 4
What is the work done equation for kinetic energy?
W=mv^2/2
What are both units for work done?
Nm(newton metre) or J(joule)
Mass:20kg
Angle:36 degrees
distance: 8m
what is the work done?
130N
W=420N
m=60kg
What is the height of the ball?
h=0.71m
