physics midterm exam 2011-2012

DO NOT WRITE ON TEST


Test Number: _______

E.L. Haynes Physics 2011-2012

Midterm Exam

Mr. DeCicco Mr. Miller


DO NOT WRITE ON TEST Page | 1

2011-‐2012 Physics Midterm Exam

a. Draw an x vs. t graph where the distance and displacement are the same. b. Draw an x vs. t graph where the distance and displacement are different.

a. According to the x vs. t graph below, at what time(s) does the velocity change?

a. For the x vs. t graph below, draw the corresponding velocity vs. time and acceleration vs. time graphs. b. For the x vs. t graph below, describe the motion in words

HS.P.D.01 I can differentiate between position, distance, and displacement.

HS.P.D.02 For the motion of an object moving with a constant velocity I can recognize the features of a diagram that represent constant velocity vs. changing velocity.

HS.P.D.03 For the motion of an object moving with a constant velocity I can translate from one graph to another and describe the motion in words based on the graph.

HS.P.D.04 For the motion of an object moving with a constant velocity I can find the average velocity using the slope of an x-‐t graph.



a. For the x vs. t graph below, what is velocity of the object between 4 and 6 seconds?

a. For the v vs. t graph below, what is the change in position of the object between 0 and 2 seconds?

a. Create an x vs. t (position vs time) graph and a v vs. t (velocity vs time) graph for an object with an initial position of 5 meters, a final position of 1 meter, and a velocity of -‐2 meters/second.

HS.P.D.05 For the motion of an object moving with a constant velocity I can find the change in position using the area beneath a v-‐t graph.

HS.P.D.06 For the motion of an object moving with a constant velocity I can draw and interpret position-‐vs-‐time graphs, velocity-‐vs-‐time graphs, & motion maps.

HS.P.D.07 I can solve problems involving average speed and average velocity.



a. A car travels 2500 m North on a straight road for 3600 seconds. What is its velocity? Express your answer in m/s. Show all of your work for full credit.

a. For the x vs. t graph below, draw the corresponding v vs. t and a vs. t graphs.

a. For the v vs. t graph below, what is acceleration of the object between 2 and 4 seconds?

HS.P.D.08 For the motion of an object moving with a changing velocity I can draw and interpret diagrams that includes position-‐vs-‐time graphs, velocity-‐vs-‐time graphs, and motion maps.

HS.P.D.10 For the motion of an object moving with a changing velocity I can find average acceleration from the slope of a v-‐t graph.

HS.P.D.11 For the motion of an object moving with a changing velocity I can find change-‐in-‐position from the area beneath a v-‐t graph.



a. For the v vs. t graph below, what is the change in position of the object between 2 and 4 seconds?

a. For the v vs. t graph below, describe the motion in words.

a. In your own words-‐ describe what velocity is and give an example. b. In your own word-‐ describe what acceleration is and give an example.

HS.P.D.13 For the motion of an object moving with a changing velocity I can describe the motion of an object in words based on a motion diagram/graph.

HS.P.D.14 I can differentiate between acceleration and velocity.

HS.P.D.15 I can differentiate between velocity and change-‐in-‐velocity.



a. From the v vs. t graph below indicate the time interval(s) when the velocity was constant.

b. From the v vs. t graph below indicate the time interval(s) when the velocity was changing.

a. From the v vs. t graph below indicate the sign (positive, negative, or zero) of the acceleration of the object for the following time intervals: 0-‐1 second, 1-‐2 seconds, 2-‐3 seconds, 3-‐4 seconds, 4-‐5 seconds, and 5-‐6 seconds.

a. For the v vs. t graph below, describe the motion in words

HS.P.D.17 I can match the sign of the acceleration with the sign of the slope on the velocity-‐vs-‐time graph.

HS.P.D.18 I can describe the motion of an object in words using the velocity-‐vs-‐time graph.

HS.P.D.19 I can solve problems using kinematics concepts.



a. Shawn is riding his bike down a straight road at 2 m/s when he accelerates at a

constant rate for 12 seconds until he reaches a velocity of 6 m/s. What is his acceleration? Show all of your work for full credit.

Gomez is standing on a tower that is 442m tall. Gomez and the tower are on planet Earth. Gomez throws a baseball horizontally from the top of the tower with a velocity of 45 m/s as seen in the diagram below:

a. What is the time (in seconds) it take the baseball to reach the ground? b. How far does the baseball travel horizontally (the direction it was thrown) in meters?

HS.P.D.21 I can solve problems for objects experiencing projectile motion with constant x-‐direction velocity and constant y-‐direction acceleration.



Gomez is standing on a tower that is 442m tall. Gomez and the tower are on planet Earth. Gomez throws a baseball

horizontally from the top of the tower with a velocity of 45 m/s as seen in the diagram below:

Based on the situation at the top of the page:

a. Create a position vs time graph for the baseball Gomez threw in the x-‐direction (direction of the throw). b. Create a position vs time graph for the baseball Gomez threw in the y-‐direction (direction of the fall).


a. Create a velocity vs time graph for the baseball Gomez threw in the x-‐direction (direction of the throw).

b. Create a velocity vs time graph for the baseball Gomez threw in the y-‐direction (direction of the fall).


a. Create an acceleration vs time graph for the baseball Gomez threw in the x-‐direction (direction of the throw). b. Create an acceleration vs time graph for the baseball Gomez threw in the y-‐direction (direction of the fall).

HS.P.D.22 For objects experiencing projectile motion I can draw separate graphs for the x-‐direction and y-‐direction components of position.

HS.P.D.23 For objects experiencing projectile motion I can draw separate graphs for the x-‐direction and y-‐direction components of velocity.

HS.P.D.24 For objects experiencing projectile motion I can draw separate graphs for the x-‐direction and y-‐direction components of acceleration.

HS.P.F.25 I can draw a force vector addition diagram for an object representing the net force on the object.



For each object, draw a free body diagram that represent the net force on the object.

a.

b.

For each object, draw and label a free body diagram showing all forces acting on an object.

a. A fan cart on a frictionless track

b.

b. A box dropped from a plane flying above Earth and is falling to the ground at a constant velocity.

HS.P.F.26 I can draw a properly labeled free body diagram showing all forces acting on an object.

HS.P.F.27 I can identify surrounding objects interacting with an object, and the forces they exert on the object.

fans



For the drawing below, draw a Free Body Diagram for Box A and Box B.

a. The three boxes are at rest on a table horizontal surface.

b.

For the following situation, draw a stack of graphs for the objects motion and a draw a free body diagram of the forces acting on the object.

a. A pumpkin is falling through the air from the roof of the E.L. Haynes High School.

HS.P.F.28 I use multiple diagrams and graphs to represent objects moving at a changing velocity. For example: Motion graphs (x-‐, v-‐, a-‐t), motion map, free body diagram, vector addition diagram, system schema.

HS.P.F.29 My free body diagrams look qualitatively accurate (balanced or unbalanced in the correct directions, relative sizes of the forces).

A B

C



For each of the following objects, draw free body diagrams with arrows that represent the relative sizes of the forces.

a. The object is traveling at a constant

velocity to the right. It is pulled by a force parallel to the surface. The surface has friction.

b.

b. The object is falling from the top of the Washington Monument.

HS.P.F.30 I can relate balanced forces to an object’s constant motion.



Javia and her brother James are working on their physics homework and disagree about what the object in the free body diagram (below) is doing.

ames says that the object is traveling at a constant velocity in any direction.

Javia says the object is either at rest or moving with a constant velocity to the right.

a. Explain why both of Javia’s answers are correct. b. Explain why James’ answer is incorrect.

Brian and JT are working on their physics homework and disagree about what the object in the free body diagram (below) is doing.

a. Explain why JT’s answer is incorrect. b. Explain why part of Brian’s answer is correct and why part of his answer is incorrect.

HS.P.F.31 I can relate unbalanced forces to an object’s changing motion.

JT says that the object is traveling at a constant velocity to the left.

Brian says the object going to the right at a constant velocity.



a. A car is traveling to the left and slows down to a stop.

Up Down Right Left

b. A sprinter starts from rest and is speeding up to the right.

Up Down Right Left

c. A rocket accelerates upward into space.

Up Down Right Left

d. A skydiver falls from a plane through the air without a parachute.

Up Down Right Left

e. A skydiver deploys his parachute slowing them down on his descent.

Up Down Right Left

a. b.

HS.P.F.32 I can determine the direction of the net force based on the object’s motion.

HS.P.F.33 I can use Newton's first law to quantitatively determine the forces acting on an object moving at a constant velocity.

HS.P.F.35 I can solve problems using Newton’s 2nd Law (Fnet = ma).

____

____

_

95 N

85 N

____

___

____

87N

39 N

Fnet = 25N right

Fnet = 27 N up



a. The statue Justice, which sits on top of the US Capital Dome needs to be

cleaned due to years of bad weather. Suppose that a helicopter is lifting the statue off of the Dome . The helicopter must exert an unbalanced force of 5,103 N to lift the statue from rest. If the statue’s acceleration equals 0.75 m/s2, what is the statue’s mass?

a. Describe 5 instances where friction is present. Be as detailed as possible.

For each of the following situations, describe the reaction force.

a. Bowling ball pushes Bowling pin

leftwards.

b. Earth pulls on ball downwards.

Convert the following: (Show all work for full credit)

a. 25 feet to meters

b. 4500 seconds to minutes

c. 35 miles/hr to m/s

HS.P.F.36 I know when two surfaces must be experiencing a friction interaction.

HS.P.F.37 When given one force, I can describe its Newton's third law force pair.

HS.P.G.67 I can convert units within the metric system of measurement and between the metric and English systems of measurement.

physics midterm exam 2011-2012

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