Motion and Force in 2-Dimensions Test 11-30-16
Study Guide
General Physics
This will be a 90-minute assessment consisting of a multiple-choice section, a short answer/ problem solving section, and one essay type question.
Topics covered: Non-Collinear Vectors, Friction and Newton’s Second Law, Static Equilibrium, Projectile Motion, and Uniform Circular Motion
Non-Collinear Vectors
What to study: Chapter 5 Section 1, MF2.1 Quiz, Vector Practice Packet
1) Find the x and y component of the following vector.
2) Solve for the unknown angle.
3) A boat is traveling at 5 m/s East across a river that is flowing South at 7 m/s. What is the boats resultant velocity?
Friction and Newton’s Second Law
What to study: Chapter 4 Section 1 & 2, Chapter 5 Section 2, MF 2.2 Quiz, Chapter 4 Study Guide
4) A 73kg ice skater pushes off of the wall with a force of 96 N. The coefficient of kinetic friction between the skates and the ice is 0.13.
- What is the acceleration of the skater during the push?
- Assuming the skater started from rest and pushed on the wall for 0.82 seconds, how fast is the skater moving after losing contact with the wall?
- How far will the skater coast before coming to a stop?
5) Explain a method you could use to determine the coefficient of kinetic friction between a hardwood floor and a cardboard box.
6) It takes 60N of force to start sliding a crate on a concrete floor. If the coefficient of static friction between the crate the floor is 0.36, what is the mass of the crate?
Static Equilibrium
What to study: Chapter 5 Section 3, Static Equilibrium Practice Packet
7) You want to hang a 5kg picture frame on the wall. Determine the force of tension in the sting for the following configurations:
8) Explain how you could move a very heavy car with a rope and a tree. Why does this work?
Projectile Motion (ignore air resistance unless otherwise stated):
9) A baseball is thrown horizontally off of a 20 m high cliff at 16m/s.
- How long does it take the ball to fall?
- What is the range of the projectile?
10) A golf ball is hit off of the t-box at 50 m/s at an angle of 23 degrees from the horizontal. Without air resistance how far will the ball fly before landing?
11) Taking air resistance into account for a projectile, explain the physics behind two ways you could maximize the range.
Uniform Circular Motion
What to study: Chapter 6 Section 2, Centripetal Force Quiz
12) In lab you swung 16 gram stopper in a circle while a 50 gram weight was suspended from a string as in the diagram below. The radius of the swing was 0.7m. What is the speed of the stopper?
13) Explain how cars can drive on a near vertical surface in the wall of death. Draw a free body diagram for the car.
14) On Mars, the acceleration due to gravity is 3.77m/s2 instead of the Earth’s 9.8m/s2. If we built a colony on Mars and had roads, the speed limit around curves would have to be reduced by over half. Explain why this would be the case.
15) What is the maximum speed a car could travel around a 20m radius curve on Mars if the coefficient of Static Friction between the mars vehicle and the dirt road is 0.65.