Forces
What is a force?
A push or a pull
What force is always present? Which way does the arrow point?
What is gravity and down?
Newton's 2nd law states?
F = M x A
What is speed a measurement of? How do you calculate it?
Speed is a measure of how fast something is going. Speed = distance/ time
How do you solve for net force on a diagram?
Add arrows in the same direction, subtract arrows going opposite ways
What does friction do?
What is slows things down, prevents things from moving?
Which way does a friction arrow point on a diagram?
What is the opposite way of motion?
What is the value of acceleration due to gravity?
9.8m/s^2
How can I turn this value into velocity? 30mph
Add a direction: ex: 30 mph south
If the arrows on both sides (facing opposite ways) are equal. Is the force balanced or unbalanced? Is the object moving?
Balanced and not moving
What are 3 ways to reduce friction?
Make the surface roll, add a lubricant, make the surface smooth
An egg is falling through the sky. What forces would be on your free body diagram and in what direction?
What is F (air) up, and F (g) down
What is the force of a 3kg object pushed at a rate of 10 m/s^2 to the left.
What is 30 N left?
Acceleration can be what 2 things?
A change in velocity (direction or speed)?
Why is an object sitting on a table balanced? What forces are balanced?
F(normal) = F(gravity). It is not moving
The normal force of a book on a desk should be equal to?
The force of gravity
Forces are vectors. How do you show the magnitude of a force on a free body diagram?
What is the acceleration of a 20kg object pushed with a force of 5N
What is 1/4 or 0.25 m/s^2?
What is the formula for acceleration?
A = F/m
A sled is rolling down a hill. What forces will eventually make the sled balanced?
What is friction and air resistance?
Finding the value for the force of gravity is the same as finding the value of
Weight
Which way does normal force face on a diagram?
Perpendicular to the surface
What is the force of a 3000g object pushed at a rate of 2m/s^2 to the right
What is 6N to the right?
What is terminal velocity?
It's when an object reaches max acceleration and cannot speed up anymore. The force of air resistance equals gravity (around 120mph down)
How does a child on a swing set represent Newton's 1st law of motion
The child is at rest on the swing until the apply a force (kick), they will continue to move back and forth at the same speed until air resistance slows them down and brings them back to rest.