True or False. A bike on grass is a form of friction?
What is true?
100
A knife is an example of this type of simple machine
What is a wedge?
100
The number of basic functions a simple machine has
What is one.
100
150 N -> + <- 250 N
100 N to the left.
100
True or False: An unbalanced force doesn't affect motion.
What is False
200
Which is a form of decreasing friction intentionaly?
A. Putting snow tires on a car when the road is icy.
B.Oil on a a squeaky door hinge.
C.Wearing cleats in field sports.
D.None of the above.
What is B.Oil on a squeaky door hinge?
200
The ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine
What is the mechanical advantage?
200
A machine or device composed of two or more simple machines
What is a complex machine?
200
33 N -> 43 N -> + <- 72 N <- 12 N
8 N to the left.
200
This is a perpendicular force. It exerts an upward force
What is a normal force
300
What is the definition of friction?
Be close to the answer for credit.
What is when two surfaces rub together and prevents or slows motion.
300
A broom is an example of this type of simple machine
What is a lever?
300
This is how you calculate mechanical advantage.
output force over input force
300
These are the diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation
What are free body diagrams?
300
This is the force of attraction between all masses in the universe
What is Gravity
400
True or False. Using snow tires on an icy road is an example of increasing friction.
What is True
400
An object falls 5 meters with a force of 980 newtons. How much work has gravity done?
What is 4900 J
400
The bottom of a light bulb that is secured into the socket so that the light bulb will stay in place.
(which simple machine)
What is a screw?
400
28 N <- + -> 63 N 65 N ->
What is 128 N to the right
400
The two components a vector must have?
magnitude and direction
500
Which one of these two are true?
A.Friction takes place when you go down a slide.
B.Friction takes place when you try to go down a street block on a metal sled.
What is B.
500
_______ makes planets spherical.
What is Gravity?
500
A wheelbarrow is made of these two simple machines.
What is a lever with a wheel and axle?
500
80 N <- -> 83 N -> 58 N
What is 61 N to the right
500
A weightlifter lifts a 350 newton weight 3 meters off the floor. What is the work done?