29 questions
The moment of inertia:
is synonymous with mass
does not depend on where the mass is located
is resistance to a change in rotational motion
indicates that more resistance to change = less inertia
Calculate the torque produced by 25 N perpendicular force at the end of a 0.40 m long wrench.
Hint: T = F x r
10 Nm
1.0 Nm
10.0 Nm
12 Nm
When 6.0 Nm of torque is applied to a wheel it constantly accelerates at 30 rad/s^2. What is the moment of inertia of the wheel?
Which equation defines rotational kinetic energy?
A bowling ball has a mass of 7.00 kg, a moment of inertia of 0.056 kg·m2, and a radius of 0.100 m. If it rolls down the lane without slipping at an angular speed of 4.00 rad/s, what is its rotational kinetic energy?
0.280 J
0.448 J
0.896 J
11.2 J
A bowling ball has a mass of 7.00 kg, a moment of inertia of 0.028 kg·m2, and a radius of 0.100 m. If it rolls down the lane without slipping at an angular speed of 4.00 rad/s, what is its translational (linear) kinetic energy?
HINT: You need to figure out its TRANSLATIONAL velocity using 2Pi rad/rev and figure out its circumference in meters using C = 2Pi*r
1.40 J
2.80 J
56.0 J
0.560 J
Which forms of energy are present for objects rolling down an incline?
Gravitational potential energy
Elastic potential energy
Kinetic energy
Rotational kinetic energy
At which point does the ball has the least gravitational potential energy (GPE)?
A
G
D
C
G
Which would have the LEAST gravitational potential energy (GPE)?
A ball sitting on the ground
Moon viewed from the Earth
An airplane flying 30,000 feet above the ground
A rock sitting on top of Mt. Everest
Which picture is NOT an example of Chemical PE?
A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 50.0 kg runs at this speed. What is the cheetah’s kinetic energy?
1457 Joules
24,025 Joules
1500 Joules
48,050 Joules
A push or a pull is called a
Gravity
Force
What is Newton's 2nd Law?
For every action there is an equal and opposite reaction.
Acceleration depends on two variables, the mass of the object and the amount of force: F = ma
What is Newton's 3rd Law?
For every action there is an equal and opposite reaction.
Acceleration depends on two variables, the mass of the object and the amount of force.
In translational motion, an objects inertia is determined by its ___________________ .
size
price
mass
position
Work is ____________________ .
hard to find
boring
a change in the universe made by energy
never fun
A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
her moment of inertia increases and her angular speed decreases.
her moment of inertia decreases and her angular speed increases.
her moment of inertia increases and her angular speed increases.
her moment of inertia increases and her angular speed remains the same.
Which ball will be harder to get rolling?
They will be equally hard to get rolling
Ball #1
Ball #2
Not enough information
Which has the bigger effect on Moment Of Inertia
Shape
Speed
Radius
Mass
The train wheel in the picture has radius = 1.00 meter and it's mass is 352 kg. What is it's Moment Of Inertia?
320 kg^2
352 kg*m^2
176 kg*m^2
141.75 m^2
A ball on a string is spun around in a circle. Which of the following quantities is not constant?
mass
force
velocity
acceleration
A uniform meterstick is balanced at the center, as shown above. Which of the following shows how a 0.50 kg mass and a 1.0 kg mass could be hung on the meterstick so that the stick stays balanced?
The rotational inertia of an object is greater when most of the mass is located
away from the axis (center)
near the center
on the rotational axis ( center)
Why is a choked-up batter easier to swing fast than one at the knob?
The bat distance from the center ( axis) of rotation is longer which decreases rotational inertia
The bat distance from the center (axis) of rotation is longer which increases RPMs
the bat distance from the center ( axis) of rotation is shorter which decreases rotational inertia
the bat distance from the center (axis) of rotation is longer which increases Torque
When this girl lets go of her string, what happens to the ball?
it flies straight due to law of inertia
it flies straight due to law of centripetal force
it curves due to rotational inertia
it curves due to its tangential speed