AP Physics with Hansenator - Midterm Exam

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2017-12-20 21:57

True/False (5 pts each):

_____ 1. A car travels around a track once, of radius 1 m, and stops, its displacement is 2π m.
_____ 2. The displacement of an object is how far it is from its initial position.
_____ 3. The area under a velocity versus time graph is the acceleration.
_____ 4. The area under a force versus time graph is the work done.
_____ 5. When an object speeds up, its acceleration is in the direction of motion.
_____ 6. In projectile motion, the acceleration is constant.
_____ 7. In projectile motion, at the top of the curve the velocity in the y-direction is zero.
_____ 8. In projectile motion, velocity in the x-direction is zero.
_____ 9. Two objects dropped from the same height will hit the ground at the same time neglecting air resistance.
_____ 10. There are 10 significant digits in 1050000000 meters.
_____ 11. An object in equilibrium (forces) will not move.
_____ 12. Newton’s Second Law states force is equal to mass times acceleration.
_____ 13. If an object is in equilibrium (zero acceleration), then there are no forces acting on it.
_____ 14. The unit for Newtons is kg∙m/s^2.
_____ 15. The unit for power is Watts, or kg∙m^2/s2.
_____ 16. Normal force is how hard the surface presses back up on an object.
_____ 17. Normal force is always equal to the weight of an object.
_____ 18. Friction is a force that acts in the same direction of the motion.
_____ 19. If a ball rolls of a table at 5 m/s, the initial velocity in the y direction is 5 m/s.
_____ 20. The angle that gives a projectile the farthest distance is 45°.

Short Answer (10 pts each):

A bullet is fired straight upwards with an initial velocity of 850 ft/s. How high did it go in meters?
A golfer on the moon (g = 1.62 m/s^2 ) drives a ball at an angle of 30 degrees with an initial velocity of 22 m/s. How far does it go?
Consider the two weights in the pulley system. Find the acceleration of the system.
Assume the 8.0-kg box moves. Find the acceleration if the kinetic friction is μ=.100.
Draw the velocity vectors at the points labeled for the projectile.
Draw a free body diagram to model the situation. Assume the box moves.
Use the conservation of energy to solve the following problem. A basketball is shot from 1.5 m with an initial speed of 4 m/s. How fast is it moving 3 m from the ground?