Inclined Planes
What is the equation for the parallel component of weight?
mgsinθ
GIFT (CHOOSE A TEAM TO GIVE POINTS TO)
BOB KARATE CHOPS A BOARD WITH A FORCE OF 3000N Downward. WHAT FORCE DOES THE BOARD EXERT ON HIS HAND? Include direction
3000N Upward
BOMB (Choose a team to LOSE points)
JIM APPLIES A 10N FORCE TO PUSH A BOX ACROSS THE FLOOR AT CONSTANT VELOCITY. WHAT IS THE MAGNITUDE OF THE FRICTIONAL FORCE ON THE BOX?
10 N
(TRIPLE POINTS)
If a force is exerted through a rope, wire, or cable what type of force is it?
Tension
GIFT (CHOOSE A TEAM TO GIVE POINTS TO)
What is the formula for Pressure?
P = Force/Area
What is the normal force equal to on an inclined plane? (Equation)
mgcosθ
(Double Points)
A 10kg block accelerates to the right at 5 m/s2. What is the net force on the block?
50 N
BOMB (Choose Team to LOSE POINTS)
FRICTION ALWAYS GOES IN THIS DIRECTION
Opposite to the direction of motion
GIFT (Choose team to GIVE points to)
Consider the situation. A book initially moving east, slows down as it slides across a rough surface.
DRAW THE FBD OF THE BOOK.
CORRECT ANSWER ON WHITE BOARD
(TRIPLE POINTS)
The units of Pressure?
What is Pascals
If an incline plane has no friction what is the acceleration of any object, regardless of mass? (equation)
a = gsinθ
(DOUBLE POINTS)
A disk slides with a constant velocity. Are the forces balanced or unbalanced?
Balanced
WHAT IS THE DIFFERENCE BETWEEN STATIC AND KINETIC FRICTION?
Static - holds object at rest, kinetic - acts against moving object
BOMB (Choose Team to LOSE POINTS)
WHAT FORCES ARE ACTING ON A BALL IN FREE-FALL?
GRAVITY
Given the Force is 16 N and the area is 4 m2
What is the Pressure?
4 pascals
How do I figure out if an object will slide down an incline if it has friction?
Calculate value of mgsinθ and see if it bigger/smaller than the static frictional force
GIFT (CHOOSE A TEAM TO GIVE POINTS TO)
If I push a tennis ball and a bowling ball with the same force, how do their acceleration compare?
Tennis ball has a smaller mass and larger acceleration, bowling ball has a larger mass and a smaller acceleration.
Static Force is bigger than the Kinetic Force (ALMOST ALWAYS)
WHAT IS THE NORMAL FORCE?
force of surface on object, perpendicular to surface
BOMB (Choose Team to LOSE POINTS)
Given the Pressure is 18 N/m2 and the area is 2m2
Calculate the Force
36N
What is the acceleration of a 5-kg object on a frictionless 30-degree incline plane.
4.9 m/s^2
A BUG HITS THE WINDSHIELD OF A CAR. USE NEWTON'S LAWS TO EXPLAIN WHY THE BUG GETS SQUASHED BUT THE CAR DOES NOT.
Same force, but bug has less mass...so more acceleration
If a 50-N book is pushed across a surface that has a coefficient of kinetic friction 0.5, what is the frictional force it experiences?
25 N
Consider the situation. A person pushes horizontally on a book against a vertical wall to keep it from sliding downwards. There is friction between the wall and the book.
DRAW THE FBD OF THE BOOK.
CORRECT ANSWER ON WHITE BOARD
2What is the area of the surface, if the pressure is 10 Pascals and the Force is 5N
0.5 m2