Show:
Friction
Forces
Motion/ Momentum
Machines and Work
Equations
100
what is formed between two surfaces to cause friction?
Micro-welds
100
What is force?
Push or pull exerted upon an object.
100
What is Newton's Third Law?
States that every action has an equal and opposite reaction.
100
What is the definition of work?
Work is the transfer of energy that occurs when a force makes an object move.
100
What the equation for force?
Force= Mass x Acceleration or F=MA
200
What is sliding friction?
Sliding friction is that opposes the motion of two surfaces sliding past each other.
200
What is gravity?
What is gravity? An attractive force between two objects that depends on the masses of an object and the distance between them.
200
What is centripetal force?
The net force exerted toward the center of a curved path.
200
______ is simply a flat surface raised at an angle, like a ramp. It is a way of lifting a load that would be too heavy to lift straight up.?
Inclined Plane
200
What is the equation for Acceleration?
Acceleration= Net Force/Mass or a=F/M
300
What is static friction?
The frictional force that prevents two surfaces form sliding past each other
300
What is Centripetal acceleration?
Acceleration toward the center of a curved or circular path.
300
What is the difference between distance and displacement?
Displacement includes direction and how the object has gone from the starting point; while distance is a measure of how and object moves.
300
How do simple machines make work easier?
They increase the force that is applied to an object, increasing the distance, and changing the direction of the force applied.
300
What is the following equation for? P=mv
Momentum
400
What are some types of friction?
Rolling friction, Static friction, Sliding friction
400
What is terminal velocity?
The constant speed that a freely falling object eventually reaches.
400
What is the momentum of a car with a mass of 1300 kg traveling at a speed of 28m/s?
P=mv P=1300kg x 28m/s P=36400m/s^2
400
What is the definition of efficiency?
Efficiency is a measure of how much the work put into a machine is changed into useful out put.
400
What is the equation for force of gravity?
Force of Gravity= Mass x Acceleration of Gravity F=mg
500
What is rolling friction?
Frictional resistance to rotation or energy losses in rolling bearings.
500
What causes the path of a projectile to be curved?
Gravity
500
Calculate the acceleration of a car going from a stand still to 50 M/s in 5 minutes.
a=Vf-Vi/t a=50m/s-0m/s/300s a=0.17m/s^2
500
What is the efficiency of a hammer if you have to out in 2000J and the hammer puts out 850J?
E= W out / W in x 100% E= 850/2000 x 100% E= 0.425 x 100% E= 42.5%
500
What is the equation for efficiency?
Efficiency= W out/ W in x 100% or E=W out/ W in x 100%