Velocity, Acceleration, Friction
A change in speed or in direction.
What is acceleration?
What can control how fast or slow you go
What is friction
What is zero?
Newton's 2nd law
What is f=ma
When an object slows down it has _____
What is negative acceleration?
A car traveled at 50 mph, slowed to 35 mph, and turned left. When did the frictional force change?
What is frictional force stayed the same?
The equation for coefficient of friction
What is frictional force divided by the normal reaction force?
To make something move, this must be greater than static friction.
What is applied force?
Newton's 3rd law
What is for every action there is an equal and opposite reaction
Distance traveled in a certain amount of time.
What is velocity?
When graphing weight vs frictional force, which one is the independent variable?
What is weight?
Box A has twice the surface area of Box B, but they both weigh 20 pounds. Which box requires more force to move?
What is neither - both require the same amount of force?
The equation for momentum
What is momentum = mass x velocity?
Name the force pairs affecting a diver on a diving board.
diver pushing down- action force
diving board pushing up- reaction force
If Sam weighs 50 lbs. and Fred weighs 75 lbs. who has to overcome more frictional force to slide down a hill on a sled?
Who is Fred?
These factors can change frictional force
What are weight and the material of the two surfaces?
This happens when surface areas are rough.
What is friction increases?
A man pushes a box to the right with a force of 50 N while a boy pushes the box to the right with a force of 15 N. State the total force on the box.
What is 65 N to the right?
A force remains at rest or stays in motion until a force acts on it
What is inertia?
Which has a lower coefficient of friction, sand paper pushed against gravel, or smooth ice against smooth ice?
What is smooth ice against smooth ice.
The units that measure frictional force.
What are newtons?
What happens to friction in space?
Friction becomes less
Joe pushes a rock to the right with a force of 12 N. Pat pushes the same rock to the left with a force of 12 N. Tell what happens.
What is, the forces are balanced, so the rock doesn't move?
How many laws of motion did Newton write?
What are Newton's 3 laws?