Download Tri A Final Review Packet

Final Review Term 1
1) Which graph represents an object at rest?
2) Which graph represents constant positive acceleration?
3) In this problem "up" is taken to be positive. A ball is thrown straight up in the air, at the very top its
velocity is negative.
m/s^2
acceleration is zero.
its acceleration is 9.8 m/s^2.
its acceleration is -9.8
4) In this problem "up" is taken to be positive. A falling object has
positive acceleration and positive velocity.
acceleration and negative velocity.
negative acceleration and negative velocity.
positive
negative acceleration and positive velocity.
5) A 5 kg (4.9 N) book rests on your desk. What is the reaction force to the 4.9 N weight (force) of the book?
The 4.9 N normal force from the table on the book.
The weight of the earth.
The 4.9 N reaction force from the book on the table.
A 4.9 N force on the Earth.
6) You stand on a bathroom scale in an elevator accelerating upwards and it reads 200 Newtons. Which of the
following is true?
You weigh 200 Newtons.
20.4 m/s^2.
The scale exert a 200 N force on you.
The acceleration of the elevator is
None of the above are correct.
7) A car pulls on a rope tied to a tree with a force of 1000 Newtons. Which of the following is not true.
The rope pulls on the tree with a force of 1000 Newtons.
Newtons.
The tension in the rope is 2000 Newtons.
The tree pulls on the rope with a force of 1000
The tension in the rope is 1000 Newtons.
8) A swimmer is swimming across a stretch of water 200.m wide at a constant 7.5 m/s.
a) How long does it take for the swimmer to cross the river?__________
b) If the current pushes the swimmer downstream at 6 m/s, how far down river will the swimmer be when
they reach the other side? ___________
9) A car with a search beacon is stolen from a home. The car is driven 6.0 miles East, 8.0 miles north, 12
miles west and parked. How far from home with the search beacon detect the car?___________
10) A ball is thrown perfectly horizontally off of the same cliff at 20m/s and lands 4.0s later. (Fill in the table)
What is the initial horizontal velocity?
What is the horizontal acceleration?
What is the final horizontal velocity?
Now that the ball is moving horizontally, list here which of the vertical values change?
What is the horizontal time?
Calculate the horizontal distance that the ball will travel.
Horizontal (x direction)
Vertical (y direction)
a=
a=
Vi=
Vi=
Vf=
Vf=
D=
D=
T=
T=
11) What is always true about the horizontal acceleration of a projectile?
12) What is always true about the vertical acceleration of a projectile (on Earth)?
Use the graph to the right of position vs. time
for a runner to answer the following
questions:
13) During what time(s) does the runner have a
constant, positive velocity?
14) During what time(s) does the runner have a
constant, negative velocity?
15) During what time(s) is the runner at rest?
16) During what time(s) is the runner accelerating?
Use the graph to the right of velocity vs.
time for a car to answer the following
questions:
17) During what time(s) does the car have a
constant, positive velocity?
18) During what time(s) does the car have a
constant, negative velocity?
19) During what time(s) is the car at rest?
20) During what time(s) does the car have a positive acceleration?
21) During what time(s) does the car have a negative acceleration?
22) What is your average velocity if you run 300 m in 15 seconds?
23) If it takes 6 seconds for your car to go from 40 m/s to a stop, what is the acceleration of your car during this
time?
24) What distance does your car travel while it is coming to a stop in the previous problem?
25) A squirrel drops an acorn from the top of a tree, 17 meters above the ground.
a) How long does it take for the acorn to fall to the ground?
b) What is the velocity of the acorn the moment it hits the ground?
26) You throw a baseball straight up into the air with an initial velocity of 41 m/s.
a) What is the acceleration of the baseball on the way up?
b) What is the acceleration of the baseball at its highest point?
c) What is the velocity of the baseball at its highest point?
d) How long does it take the baseball to reach its highest point?
e) What is the maximum height the baseball reaches?
27) A tow truck pulls on a 3500 kg car with a horizontal force of 13,000 N. The car rolls on a frictionless road.
Draw a free body diagram representing ALL the forces acting on the car. Does the car accelerate?
28) A 50 kg wagon is pulled down the sidewalk so that it accelerates at 4 m/s2. The coefficient of friction is
0.32. How much force is pulling on the wagon? Draw a free body diagram to help you answer.
29) Give an example of a situation that represents:
a) Newton’s First Law
b) Newton’s Second Law
c) Newton’s Third Law
30) The following diagram represents a mass on a string rotating in a counterclockwise circle. At each point
given, draw in (and label) arrows showing the direction(s) of the velocity, acceleration, and net force.
31) Describe the difference between centripetal force and centrifugal force. Which causes circular motion?
32) A roller coaster car goes around a vertical loop in the track. At what point in the loop is the normal force of
the track on the car the largest? At what point is it smallest? Why?
33) A rock on a rope is swung clockwise around in a horizontal circle (as shown below). If the rope suddenly
breaks, what will happen to the rock? Draw the path of the rock on the diagram below.
34) A 60 kg ice skater turns in a circle with a radius of 8 meters at a speed of 6 m/s. What is the acceleration of
the skater? How much force is acting on him? What is providing this force?
35) a) A book has a mass of 950 g. What is its weight in Newtons?
b) A crate weighs 75 N. What is its mass?