Chapter 12 review sheet.
Name______________________________
1.
What are the 4 kinds of friction?
Static, sliding, rolling, fluid.
2.
What is the SI unit for force?
newton
3.
What happens when an unbalanced force acts on an object? A balanced force?
Unbalanced
The object’s motion is changed.
Balanced
The object’s motion remains the same.
4.
What property of matter resists change in motion?
Inertia
5.
What 2 forces cause a projectile to follow a curved path?
The applied force and gravity.
6.
What is Newton’s 2
nd
law of motion?
f= m●a
Rearrange the formula for newton’s second law to solve for acceleration.
a= f/m
For mass.
m=f/a
7.
What is Newton’s 3
rd
Law of motion?
For every action there is an equal and opposite reaction.
8.
In a closed system, what is conserved when 2 objects collide?
Momentum
9.
What is Impulse?
Impulse is equal to the CHANGE in an object’s momentum.
Impulse is calculated by multiplying force by time.
w=mg
g=9.8m/s
2
momentum= mv
m
1
v
1
= m
2
v
2
10. 2
nd
Law: A tow truck exerts a net horizontal force of 1060 N on 658kilogram car.
What is the acceleration of the car during this time? Show your work.
a = 1.61 m/s
2
11. 2
nd
Law: A small engine causes a 1.2kg model airplane to accelerate at a rate of 5 m/s
2
.
What is the net force on the model airplane? Show your work.
f= 6 N
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View Full Document12. A 36 kilogram canoe broke free of its dock and is now floating downriver at a speed of 2.1 m/s.
What is the canoe’s momentum? Show your work.
Momentum = 75.6
13. A car is traveling at a speed of 85 km/hr and has a mass of 900kg.
What is the car’s momentum? Show your work.
Momentum = 76,500
14. Elastic collision. A green ball with a mass of 75 grams is traveling at a speed of 2 m/s and strikes a red ball.
What is the speed of the second ball?
Velocity of red ball = 2 m/s
15. Inelastic collision. A bullet with a mass of 7 grams and a speed of 750 m/s is fired into a holiday jello mold
with a mass of 2000g. What is the speed of the jello after the collision?
Velocity of jello/bullet combo = 2.62 m/s
16. Inelastic collision. A squirrel with a mass of 250 gram travelling 10m/s jumps onto a little red wagon with a
mass of 3000 grams. What is the speed of the squirrel/wagon combo?
Velocity of squirrel/wagon combo = .77 m/s
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 Spring '11
 Smith
 Statistics, Force, a. superman, b. cannon, c. Friction

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