Newton's Laws of Motion Labs
Terms in this set (17)
Static friction: How did we do this lab?
Placed object on ramp, tilted until it started to move. Measured angle, which we plugged into equation.
Static friction: Show the equation used to find the coefficient of static friction and how it was derived.
a=g(sinθ - μcosθ)
Make a free body diagram with Ff pointing up ramp and force parallel pointing down. Make sure that force normal is -force perpendicular
Static friction: How did we use this equation?
Set a=0 and rearrange to solve for μ
What is the equation to find the acceleration of an object on a slope with no friction and how is it derived?
Only horizontal force is force parallel pointing down ramp. a= gsinθ
Kinetic friction: What did we do in this lab?
Placed different masses on a block of different materials (wood, felt, rubber), then added mass to the end of the rope until the block moved at a constant speed along the ramp.
Kinetic: What data did we record?
Mass on metal ramp, mass hanging
Kinetic: How did we calculate the coefficient of friction from the data?
|Fn/Ff|, or the WEIGHT on metal shelf divided by weight hanging
Kinetic friction: What does the slope of each graph represent?
Coefficient of kinetic friction
Kinetic: Why was it necessary to tap the metal shelf to get the block to move?
To overcome static friction
Kinetic: Which surfaces had largest μ, and which had smallest?
Rubber had largest, wood had smallest
Kinetic: How does the force of friction vary with the normal force?
Direct linear relationship (both increase at constant rate)
On an incline plane, what does friction solely depend on?
The material, not the mass
Incline plane: What did we do?
Timed how long it took a metal ball to travel 0.5 m down an angled ramp, increasing angle
Incline plane: How did we calculate acceleration of ball?
We knew distance, and we recorded time. So we figured out velocity, then used kinematic equation to find acceleration
Incline plane: What did we graph?
Acceleration vs sine of angle
Incline plane: What should the slope of the graph be?
Incline plane: Why did we graph sine on x-axis?
Acceleration is only related to gravity and the sine of the angle, because a= gsinθ (We assumed there to be no friction in this lab)