Conceptual Physics Equations

For objects moving at a constant speed: Distance = speed x time

Average velocity or speed = Distance / Time

Slope of a line = Δy/Δx = (y2-y1)/(x2-x1)

or

Weight = Fg = mg

Acceleration due to gravity = g = 9.8 m/s2

Momentum p = mv

Kinetic Energy

Potential Energy PE = mgh

Units

1 meter = 100 cm

1 meter = 1,000 mm

Name ______

Conceptual PhysicsFree Response Practice Final Exam

Extended Response Problems

Please show work for ALL problems. If you do not show work, you cannot earn partial credit!!!

  1. The forces exerted on a 5 kg block of wood are 60 N east and 100 N west:
  1. Determine the net force acting on the block.
  1. Find the block’s acceleration.
  1. In which direction is the object’s acceleration?
  1. Draw a free body diagram that shows the forces acting on the block.
  1. A 1500 kg car hits a 180 kg bike, causing 6000 Newtons of force on the bike.
  1. What is the force of the bike on the car?
  1. What is the acceleration of the bike?
  1. What is the acceleration of the car?
  1. (a) Prepare a graph from the following data showing velocity (y-axis) versus time (x-axis).

(b) Put a best fit line through the datausing a ruler.

(c) Find the slope of the line

Time (s) / Velocity (m/s)
0 / 5
2 / 8
4 / 11
6 / 14

SLOPE = ______

  1. Use the free-body diagram shown to answer the questions below. The object has a mass of 2.5 kg.

The net force is ______N

The acceleration is ______m/s2

  1. Use the free-body diagram shown to the right. The object has a mass of 2.5 kg.

The net force is ______N

The acceleration is ______m/s2

  1. A car travels 100 miles. How much time in hours will the car save if it travels at 50 mph rather than 40 mph?
  1. A rocket has a mass of 15,000 kg. If its launch speed is 1,100 m/s.
  1. Find its momentum.
  1. Find its kinetic energy in Joules.
  1. Using a beam of light, you send a message to a space colony that’s 20 light years away. You send the message in the year 2030.
  1. When does the colony receive the message?
  1. If someone in the colony responds to you as soon as they receive the message, in what year would you receive their response?
  1. A 10 year old girl talks to you in the message the colony sends to you. What is her age when you receive the message from her?
  1. A. Convert5m to mm.

B. Convert 50 cm to meters.

C. Convert 2,000 mm to meters.

  1. A 10 kg ball is dropped from a height of 20 m. Its initial velocity is 0 m/s. [Ignore air resistance.]
  1. What is its initial kinetic energy (KE)?
  1. What is its initial gravitational potential energy (PE)?
  1. What is its total energy?
  1. What is its total energy after it has fallen 5 meters?
  1. Using a ruler, mark and label the positions of four planets in this imaginary solar system on the drawing shown to the right. The four planets you need to label are shown below. (Note: the star is at the top.) Use a scale of 1 cm = 1 Astronomical Unit (1 AU). [2 points]

Planet / Distance (A.U.)
Alpha / 4.0
Beta / 6.0
Gamma / 10.0
Delta / 11.0
  1. (a) Prepare a graph from the following data showing speed (y-axis) versus time (x-axis).

(b) Put a best fit line through the data.

Time (s) / Speed (m/s)
0 / 1
2 / 3
4 / 5
6 / 7
10 / ???

(c) The slope of the line = the acceleration of the object above is = ______m/s2

(d) Based on your best-fit line for the graph above, what would you expect the speed to be at t = 10 seconds?

  1. A 5 kg block is moving at 3 meters per second. It hits a 2 kg block that is at rest (v = 0 m/s). After the collision, the 5 kg block is moving at 1 m/s.
  1. What is the initial momentum of the 5 kg block?
  1. What is the initial momentum of the 2 kg block?
  1. What is the total initial momentum?
  1. What is the total momentum after the blocks collide?
  1. What is the momentum of the 5 kg block after the collision?
  1. What is the momentum of the 2 kg block after the collision?
  1. Using a telescope, you take an image of a star that appears to be 30 million years old. The star is 10 million-light years from you. If the star is expected to explode once it reaches 37 million years old, when did the star explode?
  1. Prepare a graph from the following data showing FORCE (y-axis) versus ACCELERATION (x-axis).
  2. Draw a best fit line through the data.
  3. Find the slope of the line.

FORCE (N) / ACCELERATION (m/s2)
3 / 2
6 / 4
9 / 6
12 / 8

SLOPE = ______