Forcing the Issue
Work and Forces
Keep it Simple
Solving
100
What force acts between any two objects?
Gravity
100
What is the unit of work?
Joule (J)
100
The IMA of a pulley system is equal to the number of ________ ______________.
Rope segments
100
In Newtons, what is the weight of a 60.1 kg hypnotic sloth?
589.581 N
200
What is the weak nuclear force?
The force that holds together the particles that make up protons and neutrons.
200
For work to be done on an object, it has to be _____________.
Moving
200
What is the effectiveness of a machine or process at converting energy from one form to another?
Efficiency
200
In seconds, how long would it take a 334 W engine to do 961 J of work?
2.89 s
300
Draw FN and Fg of an object on a slope.
300
What is the SI unit of force?
Newton
300
Which will have a higher advantage, a screw with a small angle or a screw with a big angle?
Small angle
300
What is the acceleration of a .003 kg pencil as it is moved with a 30 N force forward?
1000 m/s2 forward
400
Draw a free-body diagram of a car moving, with the force of the car and the force of friction.
400
What is the force that attempts to cause an object to move around its axis?
Torque
400
What are two types of inclined plane?
Wedges and screws
400
You have a bike that has 30 teeth. If you want the IMA of the bike to be 3, how many teeth should your gear, that is next to the pedals, be?
90 teeth
500
Describe Newton's three laws of motion.
First - objects in rest tend to stay in rest. Objects in motion tend to stay in motion unless acted on by an external force
Second - the acceleration of an object is directly proportional to the net force and is inversely proportional to the mass
Third - for every action force, there is an equal and opposite reaction force
500
What is centripetal force?
A force that accelerates an object towards the center of a circular path
500
Draw pictures of all three classes of lever.
First-class:
Second-Class
Third-class:
500
Using a simple machine to lift a box, a boy exerts a 25 N force over a distance of 10.0 m while the machine applies a 60 N force to lift the box 3.0 m. Calculate the IMA, AMA, and efficiency of the system.
IMA: 3.33
AMA: 2.4
Efficiency: 72%