Download worksheet 3 with scaffolding

Name: _________________
Date:__________
Block:______
Constant Force Unit: Worksheet 3
1. A 10,000 kg rocket is acted upon by an upward thrust of 118,000N. How fast will
the rocket be moving after 20 seconds? How far will it have moved in this time?
Draw a diagram
Consider the forces (if applicable):
 Fearthobject (determine from the mass if necessary)
 Fsurfaceobject (friction)
 Applied force or thrust
 Fstringobject (tension)
 Fgroundobject (normal)
Determine the net force (Fnet or F) (this will be along the direction of motion)
List the mass of the object with units (or determine from weight if necessary)
m=____________
Use Newton’s Second Law to find acceleration
 Write equation
 Substitute values with units
 Calculate values with units
Use Kinematics to find “how far” or “how fast” or both
 Write equation(s)
 Substitute values with units
 Calculate values with units
2.
A 500kg crate is pushed with a 2000N Force. The force of sliding friction acting
on the crate is 1900N. How fast will the crate be moving after 10 seconds? How
far will it have moved in this time?
Draw a diagram
Consider the forces (if applicable):
 Fearthobject (determine from the mass if necessary)
 Fsurfaceobject (friction)
 Applied force or thrust
 Fstringobject (tension)
 Fgroundobject (normal)
Determine the net force (Fnet or F) (this will be along the direction of motion)
List the mass of the object with units (or determine from weight if necessary)
m=____________
Use Newton’s Second Law to find acceleration
 Write equation
 Substitute values with units
 Calculate values with units
Use Kinematics to find “how far” or “how fast” or both
 Write equation(s)
 Substitute values with units
 Calculate values with units
3. An elevator is lifted with a tension (Fcableelevator) of 50,000 N. The weight
of the elevator is 49,000N. How fast will the elevator be moving after 5 seconds
if it starts from rest?
Draw a diagram
Consider the forces (if applicable):
 Fearthobject (determine from the mass if necessary)
 Fsurfaceobject (friction)
 Applied force or thrust
 Fstringobject (tension)
 Fgroundobject (normal)
Determine the net force (Fnet or F) (this will be along the direction of motion)
List the mass of the object with units (or determine from weight if necessary)
m=____________
Use Newton’s Second Law to find acceleration
 Write equation
 Substitute values with units
 Calculate values with units
Use Kinematics to find “how far” or “how fast” or both
 Write equation(s)
 Substitute values with units
 Calculate values with units
4. A car with a mass of 1500 kg has an engine which can produce 4000N of thrust.
Assume that the air resistance on the car is a constant 500N. If the car starts from
rest, how fast will it be moving after 10 seconds? How far will it have moved in
this time?
Draw a diagram
Consider the forces (if applicable):
 Fearthobject (determine from the mass if necessary)
 Fsurfaceobject (friction)
 Applied force or thrust
 Fstringobject (tension)
 Fgroundobject (normal)
Determine the net force (Fnet or F) (this will be along the direction of motion)
List the mass of the object with units (or determine from weight if necessary)
m=____________
Use Newton’s Second Law to find acceleration
 Write equation
 Substitute values with units
 Calculate values with units
Use Kinematics to find “how far” or “how fast” or both
 Write equation(s)
 Substitute values with units
 Calculate values with units
5. A 225 kg crate is pushed horizontally with a force of 710 N. If the coefficient of
friction (mu, or ) is 0.20, calculate how far it will have travelled and how fast it
will be going after 15 seconds.
Draw a diagram
Consider the forces (if applicable):
 Fearthobject (determine from the mass if necessary)
 Fsurfaceobject (friction)
 Applied force or thrust
 Fstringobject (tension)
 Fgroundobject (normal)
Determine the net force (Fnet or F) (this will be along the direction of motion)
List the mass of the object with units (or determine from weight if necessary)
m=____________
Use Newton’s Second Law to find acceleration
 Write equation
 Substitute values with units
 Calculate values with units
Use Kinematics to find “how far” or “how fast” or both
 Write equation(s)
 Substitute values with units
 Calculate values with units
6. A 50 kg sled is pulled along a snow-covered ground. If the coefficient of friction
between the sled and the ground (mu, or ) is 0.10, what force must be applied in
order to move the sled from rest to a speed of 6.0m/s in 2.0seconds?
Draw a diagram
Consider the forces (if applicable):
 Fearthobject (determine from the mass if necessary)
 Fsurfaceobject (friction)
 Applied force or thrust
 Fstringobject (tension)
 Fgroundobject (normal)
Determine the net force (Fnet or F) (this will be along the direction of motion)
List the mass of the object with units (or determine from weight if necessary)
m=____________
Use Newton’s Second Law to find acceleration
 Write equation
 Substitute values with units
 Calculate values with units
Use Kinematics to find “how far” or “how fast” or both
 Write equation(s)
 Substitute values with units
 Calculate values with units