Problems – 1 A ball of mass ____ grams is tossed straight up in the air. Assuming air resistance can be ignored, draw an FBD for the ball on its way up. Draw a 2 nd FBD for the ball on its way down. Also draw an FBD for the ball at the top of its motion. Determine the ball’s acceleration in each case. (1 force vectors) G:UpDownTop U: E: S:

Problems – 2 The ball from Q1 is falling straight down, but now consider that there is a ____N force or air resistance. Draw an FBD and determine the mass’s acceleration. (2 force vectors) G: U: E: S:

Problems – 3 An elevator (mass = ____kg) is held at rest from a vertical cable. Determine the tension in the cable. (2 force vectors) G: U: E: S:

Problems – 4 The elevator from Q3 is now moving upward, accelerating in that direction at the rate of ____ m/s 2. Find the cable’s tension. (2 force vectors) G: U: E: S:

Problems – 6 A _______ kg mass sits at rest on a horizontal surface. A smaller mass, _______ kg, sits atop the first mass. Draw an FBD for the first mass, and then determine the normal force on it. (3 force vectors) G: U: E: S: m1m1m1m1 m2m2m2m2

A submarine of mass _____kg mass sits at rest on the ocean floor supported by a buoyant force of _____N. Draw an FBD and then determine the normal force on the submarine. (3 force vectors) G: U: E: S: Problems – 7

Problems – 8 G: m g FpFp a x = 0 a y = 0 U: F b = ? F r = ? E:

Problems – 9 G:mFtG:mFt g a x = 0 a y = 0 U: F l = ? F r = ? E:

Problem – 10 A box of mass ______ kg is at rest on a horizontal floor. If the coefficient of static friction is ____, find the force needed to make the box begin moving. (4 force vectors) G: U: E:

Problem – 11 If the coefficient of kinetic friction is _____, what force is required to keep the box from Q10 moving at a constant speed? (4 force vectors) G: U: E:

Problem – 12 An already-sliding hockey puck of mass _______ grams is pushed horizontally by a hockey stick with a force of _______ N in the direction of its motion. The coefficient of kinetic friction is ______. Find the acceleration of the puck. (4 force vectors) G: U: E:

The hockey puck of Q12, having been pushed, is now sliding across the ice toward the goal. Find the new acceleration of the puck. (3 force vectors) G: U: E: Problem – 13

Problem – 14 A ____kg mass slides across a horizontal surface due to a horizontally-applied force of ____N. The coefficient of kinetic friction is ____. Draw an FBD and then find the acceleration of the mass. (4 force vectors) G: U: E:

Problem – 15 A box of mass ______ kg is sliding quickly along a horizontal floor to the right. Via a rope, a boy is applying a horizontal force of _____ N to the left in an effort to slow the box down. If the coefficient of kinetic friction is ____, find the acceleration of the box. (4 force vectors) G: U: E:

Problem - 16 After the skater from the Sample problem is in motion, it is noticed that a horizontal force of ____N is necessary to keep the skater moving at a constant velocity. Find the coefficient of kinetic friction between the skates and the ice. (4 force vectors) m F a = ____N to maintain motion g a x = 0 a y = 0  k = ?

A student pulls on a strap attached to a suitcase and moves it down the airport terminal. The student pulls with a force of ____N at an angle of ____ degrees above the horizontal. The suitcase has a mass of ____kg, and mk between the suitcase and the floor is ____. Find the acceleration of the suitcase. (4 force vectors) G: U: E: Problem – 17

Problem – 18 A box of mass ______ kg is moving along a horizontal floor at a constant velocity of ______ m/s to the right. A girl is pushing down-and-to-the-right on the box with a force of ______ ______ degrees below the horizontal. Find the coefficient of kinetic friction. (4 force vectors) G: U: E:

Problem – 19 A child on a sled just begins to slide down a slope with no additional force. If the hill is at a ____ degrees incline, what is the coefficient of friction? Is it static or kinetic? G: U: E:

Problem – 20 A child on a sled slides down a ____ degree hill at a constant speed. What is the coefficient of friction? Is it static or kinetic? G: U: E:

Problem – A _____ kg suitcase is being pulled up a ____ degree incline by a force of ______ N that is parallel to the incline. If the coefficient of kinetic friction is ____, what is the acceleration of the suitcase? (4 force vectors) G: U: E:

Problem – 22 A _____ kg mass is accelerating at the rate of _____ m/s 2 up an incline of _____°, due to an applied force that is parallel to the incline. If the coefficient of kinetic friction is _____, determine the magnitude of the applied force. (4 force vectors) G: U: E: