Download 16-17 Physics Mid-term review packet

Name _____________________
Period _________
Physics
Mr. Harman
Physics Mid-Term Review Packet
One Dimensional Motion
Definitions (write the definition of each of the following terms)
Displacement
Velocity
Acceleration
Gravity
What is the difference between speed and velocity?
What are the vertical velocity and acceleration of an object at the highest point of its trajectory?
Will all objects released from rest fall at the same rate? Does air resistance make any difference?
If my velocity is positive and my acceleration is negative, am I speeding up or slowing down?
Two Dimensional Motion
Definitions
Horizontal Projectile Motion
Angular Projectile Motion
Without friction, will the horizontal velocity of a projectile stay constant or change? What happens when
friction is included?
What angle will give the most distance for angular projectile motion?
If a plane drops a package directly over a target, will the object hit the target? Why or why not?
If two objects are rolled off of a table with different velocities, which object will land first?
Explain the steps for adding two non-perpendicular vectors.
Forces and Laws of Motion
Definitions
Force
Inertia
Net Force
Equilibrium
Normal Force
Coefficient of friction
What are Newton’s 3 laws?
What are the two types of forces?
What is the difference between a force diagram and a free body diagram?
What is the difference between mass and weight?
What are the two factors that determine the frictional force?
What are the two types of friction, and which is larger? Is it always?
Work and Energy
Definitions
Work
Kinetic Energy
Potential Energy
Elastic Potential Energy
Mechanical Energy
Power
Do all forces do work? List the two conditions for a force to do work.
What two factors affect the kinetic energy?
Is mechanical energy always conserved? Explain why or why not.
What causes the total energy of an object to change?
Problems – Do problems on a separate sheet, show all Work and circle answers
1. A ball is thrown vertically upward with a speed of 25.0 m/s from a height of 2.0 m.
a. How long does it take to reach its highest point?
b. How high does the ball rise?
c. How long does the ball take to hit the ground after it reaches the highest point?
d. What is the ball’s velocity when it returns to the height of 2.0 m?
2. A newspaper boy walks North for 2.5 m and then walks West for 6.3 m. What is the resulting displacement
for the boy? What was the distance traveled?
3. A daredevil is shot out of a cannon at 45.0º to the horizontal with an initial speed of 25.0 m/s. A net is
positioned a horizontal distance of 50.0 m from the cannon. At what height above the cannon should the net
be placed in order to catch the daredevil?
4. A 1200 kg boat moves through the water with two forces acting on it. One is a 2100 N forward push by the
motor and the other is an 1800 N resistive force due to the water.
a. What is the acceleration of the boat?
b. If it starts from rest, how far will it move in 10.0 s?
c. What will its velocity be after the 10.0 s?
5. A girl sleds down a large hill. Her velocity at the bottom of the hill is 7.0 m/s. She then slides along a
horizontal field. If the girl and the sled together weigh 645 N, and the coefficient of kinetic friction between
the runners and the snow is 0.050, how far will she travel until she comes to rest?
6. If the Green Goblin is riding his Goblin Glider in an effort to evade Spiderman. Spiderman is running at
10.0 m/s toward the front on top of a train traveling at 15.0 m/s East. Green Goblin decides to run at 5.0
m/s W across his glider that is moving at 23.0 m/s North in an attempt to jump off and avoid Spiderman’s
web. What is Green Goblin’s speed relative to Spiderman so Spiderman can accurately shot his web?
7. A rock is thrown downward from the top of a cliff with an initial speed of 12 m/s. If the rock hits the ground
after 2.0 s, what is the height of the cliff?
8. A ball is rolled off a table that is 1.25 m high with a speed of 1.20 m/s. How far horizontally will the ball
land from the table?
9. A catcher “gives” with a baseball when catching it. If the baseball exerts a force of 475 N on the glove, so
that the glove is displaced 10.0 cm, how much work is done by the ball?
10. How fast would you be traveling at the bottom of a roller coaster's hill if you were traveling at 25.0 m/s at
the top of the 100.0 m high hill? The mass of the car with you is 800.0 kg.
Honors Only
11. A ball player hits a home run, and the baseball just clears a wall 21.0 m high located 130.0 m from home
plate. The ball is hit at an angle of 35.0° to the horizontal, and air resistance is negligible. Assume the ball
is hit at a height of 1.0 m above the ground.
a. What is the initial speed of the ball?
b. How much time does it take for the ball to reach the wall?
c. Find the components of the velocity and the speed of the ball when it reaches the wall
12. The coefficient of static friction between the 3.00 kg crate and the incline to the right is 0.300. What is the
minimum value for force F that will keep the block from sliding down the incline?