Equations
Force mass and accelerations hands on and sim
Vocabulary 1
Vocabulary 2
Vocabulary 3
Designing Wheelchairs
Mousetrap cars
100
What is the equation for force?
mass X acceleration
100
Which object was more affected by a 2 newton force the pingpong ball or the golf ball? Why?
ping pong ball because it has less mass
100
What is a push or a pull exerted on and object called?
force
100
This is the force that opposes the motion of an object that rolls across a surface.
rolling friction
100
These are forces that are equal in strength but opposite in direction.
balanced forces
100
Why do Engineers make different wheelchairs?
To meet the needs of their users.
100
What is the goal of our mousetrap car competition?
Build a car that goes the longest distance
200
What are the units for force
Newtons
200
What was more affected when struck four times with the hammer in the sim, a .5 kilogram mass or a 4 kilogram mass? Why
a .5 kilogram mass because it has less mass
200
What is speed in a given direction called?
velocity
200
This is a force that opposes the motion of an object that slides across a surface.
sliding friction
200
These are forces that are unequal in strength and opposite in direction.
unbalanced forces
200
How are racing wheelchairs designed to fit two needs of their users?
They are lighter so their applied force is greater causing them to go faster.
It is easier for them to stop the chair at the end of the race.
200
What happens to the force applied by the mousetrap if we increase mass of the mousetrap?
it is reduced
300
What are the units for acceleration?
meters per second squared
300
If the ping pong ball collides with the golf ball how will the forces in the collisions compare, and which ball will have a less acceleration?
The forces are equal in strength and opposite in direction and the golf ball will have less acceleration.
300
What is a force that opposes the motion of an object called?
friction
300
This is a force that opposes the motion of an object caused by matter that flows.
fluid friction
300
How fast an object travels.
speed
300
How do Rugby wheelchairs support the needs of their users?
THey have more mass, so it prevents players from toppling over in a collision.
300
Which wheel will reduce rolling friction best, a drag wheel or cd wheel?
cd wheel
400
An object accelerates at 2 meters/second2, how fast will it move after 4 seconds?
8 meters per second
400
Calculate the force of a ping pong ball that collides with the ground if the mass is .0000015 kilograms and its acceleration is 10 meters/second2.
.000015 Newtons
400
What are the two upward forces that work on objects called?
Normal and buoyant
400
This is a force that opposes the motion of an object between two objects that touch but do not move in relation to each other, often allowing objects to start or stop.
static friction
400
This is a force exerted on an object by a surface that opposes the downward force of gravity.
normal
400
How does the force required to move compare in the picture below?
A Rugby wheelchair requires more force to move.
400
Which ways do wheels on your mousetrap car exert force on the ground?
down and back
500
What is another way we can write 1Newton?
1 kilogram X 1 meter/second2
500
How did the ping pong ball lab relate to collisions?
It shows us that in a collisions a lighter mass will have a greater acceleration even though forces are the same.
500
The effect of gravity on mass is called?
weight
500
What are the four forces of friction called?
fluid, sliding, rolling and static
500
This is the force of attraction between two objects that have mass.
gravity
500
What are three design requirements that engineers consider when designing wheelchairs?
budget, users personal style, users needs
500
What are the design requirements of our mousetrap car?
it must cost less than two dollars to make, it must be solely powered by one mousetrap
600
The mass of a bowling ball is 6 kilograms, it's acceleration is 10 meters/second2, how much force is exerted on Mrs. Jameson's foot when she drops it?
60 Newtons
600
What are three things you should include in your reasoning statement when we conduct labs?
restate your hypothesis
include data you collected
explain whether data supported or refuted your claim
600
What are the four forces of friction called?
static, fluid, rolling, sliding
600
The fluid friction exerted on a hockey pucks is 5 newtons and the sliding friction of the ice is 20 newtons, what is the net force and direction of the puck if the puck has an applied force of 80 newtons.
55 newtons
600
What happens to the affect of gravity as masses get closer together and have large masses?
The force increases.
600
What were three properties that meet the needs of tennis players in wheelchairs?
light, strong and easy to adjust quickly
600
A mousetrap car goes 2 meters in 6 seconds, what is its speed in meters per second?
.33 meters per second