# AP Physics with Hansenator - Midterm Exam Solutions

## True/False (5 pts each):

**F** 1. A car travels around a track once, of radius 1 m, and stops, its displacement is 2π m. **0 m**

**T** 2. The displacement of an object is how far it is from its initial position.

**F** 3. The area under a velocity versus time graph is the acceleration. **Displacement**

**T** 4. The area under a force versus time graph is the work done.

**T** 5. When an object speeds up, its acceleration is in the direction of motion.

**T** 6. In projectile motion, the acceleration is constant.

**T** 7. In projectile motion, at the top of the curve the velocity in the y-direction is zero.

**F** 8. In projectile motion, velocity in the x-direction is zero. **Sometimes**

**T** 9. Two objects dropped from the same height will hit the ground at the same time neglecting air resistance.

**F** 10. There are 10 significant digits in 1050000000 meters. **Three**

**F** 11. An object in equilibrium (forces) will not move. **Will not accelerate**

**T** 12. Newton’s Second Law states force is equal to mass times acceleration.

**F** 13. If an object is in equilibrium (zero acceleration), then there are no forces acting on it. **There can be**

**T** 14. The unit for Newtons is kg∙m/s^2.

**F** 15. The unit for power is Watts, or kg∙m^2/s^2. **kg m^2/s^3**

**T** 16. Normal force is how hard the surface presses back up on an object.

**F** 17. Normal force is always equal to the weight of an object. **Not Necessarily**

**F** 18. Friction is a force that acts in the same direction of the motion. **Opposite**

**F** 19. If a ball rolls of a table at 5 m/s, the initial velocity in the y direction is 5 m/s. **x-direction**

**T** 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.

Notice that the velocity in the x-direction is constant and the velocity in the y-direction is affected by gravity, slowing it from positive speed to negative speed. - 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?

## Free Response (50 pts):

Reference: https://secure-media.collegeboard.org/apc/ap10_frq_physics_b.pdf

(a)

(b)

(c)

(d)

(e)

#### All SteemitEducation Posts

###### Physics

Kinematics Video, Circular Motion Video, Forces in 1 & 2 Dimensions Videos, Kinematics Full Lesson, Circular Motion and Gravitation Full Lesson, Kinematics and Forces Quiz, Forces in 1-Dimension, Forces in 2-Dimensions, Basic Physics, Kinematics, and Forces Review, AP Physics Exam 1

###### Computer Science

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16

###### SAT

Asymptotes, Composite Functions, Contest 1 - Area, Contest 1 – Winners and Solution, PEMDAS, Systems of Equations, Functions, Exponents, Contest 2 - More Functions, Contest 2 – Winners and Solution, Percents, The Interest Equation, All About Division, Contest 3 - Factoring, Contest 3 – Winners and Solution, Fractional and Negative Exponents, Basic Trig, Contest 4 - Math Vocab, Contest - 5, Contest 5 – Winners and Solution, Contest 6,

###### General Math

Basics of Algebra, Trigonometry Video, Proof of Quadratic Formula, Factoring Video, Unions and Intersections, Surface Area of a Cylinder, Substitution Video, Combinatorics Basics

###### Graphing from Algebra to Calculus

Algebra 1, Algebra 2, Pre-Calculus, Calculus

###### Piloting Airplanes

Introduction, Preflight, Requirements, Instruments, Take-Offs and Landings, Why a Plane Can Fly, Reading the Runway, Maneuvers

###### Other

Engineering (Isometric) Drawing, Pressure & SCUBA Diving

steemiteducation (72)7 years agominnowspower (55)7 years agoThis post has received a 50% upvote worth $2.02 from @minnowspower

thanks to: @theguruasiaMinnowsPower is not a bot, I am a Crowdfunding Hybrid