Download A moving company uses the pulley system in figure 1 to lift heavy

Forces Assignment
Ch. 4
SHOW ALL YOUR WORK!!!
Name: _______________
Per.: _______
A moving company uses the pulley system below to lift heavy crates up a ramp.
1. Draw lines (vectors) showing all the forces acting on the crate on the ramp.
Assume the crates are moving at a constant velocity
Coefficient of friction
Wood crate & cement μstatic = .6
Wood crate & cement μkinetic = .4
ramp
crate
Cement ground
2. Draw all the vectors showing all the forces acting on the crate on the ground.
3. What is the name of the force that acts upward on the crates, perpendicular to the
surface?
4. Considering only the crate on the ground, if the crate is moving at a constant speed and
has a force of 500 N pulling on it, what is the force of friction?
5. Considering only the crate on the ground, what is the normal force? (hint: coefficient of friction)
6. What is the mass of the crate?
7. Considering only the crate on the ground, if the crate was not moving on the ground,
how much force is needed by the cable to initially get the crate moving?
8. What is the normal force acting on the crate on the ramp?
9. Would it take more, less or the same force to move the crate, if the ground was made
of a substance which would make the coefficient of friction .3?
10. Will it take more, less or the same force to pull the crate on the ramp at a constant
speed as it does the crate on the ground at a constant speed (both crates have equal mass)?
11. You pull a 100,000 kg magnetically levitating train (zero friction between the train
and ground) with a force of 500 N. By how much does the train accelerate?
12. If a child has a mass of 30 kg, what is their weight in Newtons?
Newton’s 1st, Newton’s 2nd or Newton’s 3rd Law
13. For every force, there is an equal and opposite force. __________________
14. An object in motion will stay in motion unless a force acts upon it. _______________
15. A force that acts upon a mass will make it accelerate. _________________
16. The closer 2 object get to each other, the gravitational forces between them increases.
TRUE or FALSE
17. Using a cable, a truck pulls a car behind it with a force of 300 N. How much is the
car pulling on the truck?
A) 0 N
B) 300 N
C) 600 N
D) 90,000 N
Consider the forces on the truck below:
100 N
10,000 kg
120 N
backward
forward
18. Is the truck speeding up, slowing down or moving at a constant speed?
19. By how much will the truck accelerate or decelerate or will it not accelerate at all?
20. Is the truck in a state of equilibrium (all the forces are balanced)?
YES
NO
Consider the situation for a moon of planet Shafferion where
A 100 kg astronaut is standing on the surface.
Mass = 7 x 1018 kg
21. How much gravitational force is the moon pulling on the
astronaut?
10,000 meters
22. How much gravitational force is the astronaut pulling on
the moon?
23. What is the gravitational acceleration of the astronaut as he/she
stands on the moon?
24. How would an astronaut find the mass of a rock on the moon of Shafferion?
A) Use a scale
B) Use a balance
C) neither of these would work
Consider a woman in an elevator who has a mass of 50 kg
25. The elevator accelerates downward at 1 m/s2, what will be the woman’s apparent
weight be on the elevator?
26. When the elevator moves downward at a constant velocity, what is her apparent
weight?
27. If the elevator cable were to snap, what would be her apparent weight?