2.) A frictionless ramp is tilted at an angle of 37°. A 4.2kg box is released from rest at the top of the ramp and allowed to accelerate downward. a. Draw a picture of the situation. b. Draw a free body diagram. c. Determine the component of gravity necessary and use the appropriate technique (inertial or forced motion) to determine the Normal Force on the box. d. Determine the component of gravity necessary and use the appropriate technique (inertial or forced motion) to determine the acceleration on the box after release.

2. A 3.00 kg block is placed at the top of a 21.0° rough inclined plane with us = 0.325 and Hk =0 .215 %3D and a length of 1.78 m. a) Draw a free-body diagram of the block. b) Prove that, if released from rest, the block will immediately start sliding. c) Find the magnitude of the block's acceleration. d) Calculate the time the block takes to reach the end of the incline.

a. An object that is free-falling is acted upon by the force of gravity alone. b. A falling skydiver which has reached terminal velocity is considered to be in a state offree fall. c. A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state offree fall d. An object in free fall experiences an acceleration which is independent of the mass of the object. e. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. As the ball rises, its acceleration is upwards; as it falls, its acceleration is downwards. f. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. The speed at which it is launched equals the speed at which it lands. (Assume negligible air resistance.) g. A very massive object will free fall at the same rate of acceleration as a less massive object.

A high jumper with a body weight of 900N exerts an average vertical force of 2150N down on the floor for 0.50 s. The average vertical force exerted on the jumper by the floor is: a. 2150N b.1640N c. 900N d.3050N