Question

Phys 222 Worksheet 1 Forces and Kinematics . In a local bar, a customer slides an empty beer mug down the counter for a refill The height of the counter is 1.14 m. The mug slides off the counter and strikes the floor 0.40 m from the base of the counter (a) With what velocity did the mug leave the counter? (b) What was the direction of the mug's velocity just before it hit the floor? 2. A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal. Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 22.0 m/s at an angle of 50.0 to the horizontal (a) By how much does the ball clear or fall short of clearing the crossbar? (Enter a negative answer if it falls short.) (b) Does the ball approach the crossbar while still rising or while falling? 3. The cube in the figure is given a push up the incline What distance a the surface is frictionless, and 17.0 so that its initial velocity is 3.00 mýs. long the incline (in m) does the cube move before coming to rest? Assume 4. A woman at an airport is towing her 23.0 kg suitcase at constant speed by pulling on a strap at an angle 8 above the horizontal (see figure). She pulls on the strap with a 33.5 N force, and the friction force on the suitcase is 20.0 N. a)Draw a free-body diagram of the suitcase. b) What angle does the strap make with the horizontal (in degrees)? c) What is the magnitude of the normal force that the ground exerts on the suitcase (in N)?

Answer 1