1) Explain why a car with a greater mass would need brakes that can exert a
greater braking force in order to operate safely.
A heavier object has higher momentum and higher kinetic energy, which are both
dependent on the mass of a moving object. In order to reduce the speed of a moving object
energy is required. The energy required is the sum of its kinetic energy, potential energy and
momentum energy.
2) In order to move some heavy machinery onto a stage, Kevin sets up a ramp.
The ramp allows him to move a 510 N piece of sound-equipment with a force of
165 N. What is the mechanical advantage of the ramp Kevin set up?
A 1.0
B 4.5
C 0.32
D 3.1
3) Joshua is pushing a set piece for the school play onto the stage. If he applies a
95 N force for a period of 1.3 seconds, how much will the set piece's momentum
change during that period?
A 440 kg*m/s
B 73 kg*m/s
C 54 kg*m/s
D 120 kg*m/s
4)Two skydivers are in free fall. One skydiver is moving towards the other. When
they collide, they link arms, and travel downward as a single unit. Why type of
collision is this?
A Recoil collision
B Elastic collision
C This is not a collision
D Inelastic collision
5) A 72 kg runner is traveling south at a speed of 5.1 m/s. What is the runner's
momentum?
A 310 kg*m/s
B 26 kg*m/s
C 14 kg*m/s
D 370 kg*m/s
6) Clementine is spinning a merry-go-round. When she pulls on the handle, her
force is perpendicular to the radius of the ride. If she pulls with a force of 44 N,
and the radius of the merry-go-round is 1.7 m, how much torque did Clementine
exert on the ride?
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, A 49 Nm
B 26 Nm
C 75 Nm
D 110 Nm
7) In a recoil collision, the force that pushes the two objects apart must come
from within the two objects in order for momentum to be conserved. Give an
example that demonstrates how an outside force interfering would allow the
momentum of the two objects to not be conserved. Explain in your own words.
An outside force intervening a collision between two objects that have recoil collision would
lessen the energy between the collision. If an inelastic object interacts between them, the
would be a transfer of energy. An example of this is when you put a slab of wood between
two billiard balls, there would be recoil because the energy has transferred to an inelastic
object.
8) A scissor lift performs 9400 joules of work in a period of 2.4 seconds. How
much power is the scissor lift producing?
A 450 W
B 9400 W
C 22,600 W
D 3900 W
9) While we usually use the unit of the watt, the horsepower is often used to
describe the amount of power produced by an engine. Explain what effect a
higher horsepower engine has on the performance of a car. Use the term “kinetic
energy” in your explanation.
Horsepower is a measure of an engines ability to produce energy. Higher horsepower means
it can produce energy that would be able to increase it’s kinetic energy from zero to any
higher number.
10) Harrison is holding on to a tree branch. The branch is angled 15 ° below
horizontal. If Harrison weighs 640 N, and he is holding onto the branch 2.1 m
away from the trunk, how much torque is he exerting on the tree?
A 1900 Nm
B 770 Nm
C 350 Nm
D 1300 Nm
11) Two balls of clay are launched into the air. One, which has a mass of 0.75 kg,
travels north at a speed of 11.0 m/s. The other, which has a mass of 0.40 kg,
travels south at a speed of 14.4 m/s. When the two balls collide, they fuse to form
a single unit. What is the velocity of the single unit?
A −1.7 m/s
This study source was downloaded by 100000850872992 from CourseHero.com on 03-17-2023 18:51:53 GMT -05:00
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greater braking force in order to operate safely.
A heavier object has higher momentum and higher kinetic energy, which are both
dependent on the mass of a moving object. In order to reduce the speed of a moving object
energy is required. The energy required is the sum of its kinetic energy, potential energy and
momentum energy.
2) In order to move some heavy machinery onto a stage, Kevin sets up a ramp.
The ramp allows him to move a 510 N piece of sound-equipment with a force of
165 N. What is the mechanical advantage of the ramp Kevin set up?
A 1.0
B 4.5
C 0.32
D 3.1
3) Joshua is pushing a set piece for the school play onto the stage. If he applies a
95 N force for a period of 1.3 seconds, how much will the set piece's momentum
change during that period?
A 440 kg*m/s
B 73 kg*m/s
C 54 kg*m/s
D 120 kg*m/s
4)Two skydivers are in free fall. One skydiver is moving towards the other. When
they collide, they link arms, and travel downward as a single unit. Why type of
collision is this?
A Recoil collision
B Elastic collision
C This is not a collision
D Inelastic collision
5) A 72 kg runner is traveling south at a speed of 5.1 m/s. What is the runner's
momentum?
A 310 kg*m/s
B 26 kg*m/s
C 14 kg*m/s
D 370 kg*m/s
6) Clementine is spinning a merry-go-round. When she pulls on the handle, her
force is perpendicular to the radius of the ride. If she pulls with a force of 44 N,
and the radius of the merry-go-round is 1.7 m, how much torque did Clementine
exert on the ride?
This study source was downloaded by 100000850872992 from CourseHero.com on 03-17-2023 18:51:53 GMT -05:00
https://www.coursehero.com/file/114323046/Physics-A-Module-6-Exam-answers/
, A 49 Nm
B 26 Nm
C 75 Nm
D 110 Nm
7) In a recoil collision, the force that pushes the two objects apart must come
from within the two objects in order for momentum to be conserved. Give an
example that demonstrates how an outside force interfering would allow the
momentum of the two objects to not be conserved. Explain in your own words.
An outside force intervening a collision between two objects that have recoil collision would
lessen the energy between the collision. If an inelastic object interacts between them, the
would be a transfer of energy. An example of this is when you put a slab of wood between
two billiard balls, there would be recoil because the energy has transferred to an inelastic
object.
8) A scissor lift performs 9400 joules of work in a period of 2.4 seconds. How
much power is the scissor lift producing?
A 450 W
B 9400 W
C 22,600 W
D 3900 W
9) While we usually use the unit of the watt, the horsepower is often used to
describe the amount of power produced by an engine. Explain what effect a
higher horsepower engine has on the performance of a car. Use the term “kinetic
energy” in your explanation.
Horsepower is a measure of an engines ability to produce energy. Higher horsepower means
it can produce energy that would be able to increase it’s kinetic energy from zero to any
higher number.
10) Harrison is holding on to a tree branch. The branch is angled 15 ° below
horizontal. If Harrison weighs 640 N, and he is holding onto the branch 2.1 m
away from the trunk, how much torque is he exerting on the tree?
A 1900 Nm
B 770 Nm
C 350 Nm
D 1300 Nm
11) Two balls of clay are launched into the air. One, which has a mass of 0.75 kg,
travels north at a speed of 11.0 m/s. The other, which has a mass of 0.40 kg,
travels south at a speed of 14.4 m/s. When the two balls collide, they fuse to form
a single unit. What is the velocity of the single unit?
A −1.7 m/s
This study source was downloaded by 100000850872992 from CourseHero.com on 03-17-2023 18:51:53 GMT -05:00
https://www.coursehero.com/file/114323046/Physics-A-Module-6-Exam-answers/
