Review 6 (Linear Kinetics) Flashcards
A skater gliding on ice will continue to move in the same direction and with the same speed (in the absence of the action of additional forces). This exemplifies which of the following laws?
Question options:
1) Newton’s third law of action/reaction
2) Newton’s first law of inertia
3) Newton’s second law of acceleration
4) Newton’s law of gravitational force
Newton’s first law of inertia
A 500N gymnast performing a giant swing with an angular velocity of 5 rad/sec, exerts 90 Nm of torque on the support bar. How much torque is exerted by the bar on the gymnast’s hands?
Question options:
1) 100 Nm
2) 90 Nm
3) 2500 Nm
4) 590 Nm
90 Nm
What is/are the direction(s) for vertical ground reaction force?
Question options:
1) Up
2) Down
3) Lateral
4) All of the above
Up
What type of energy is strain energy?
Question options:
1) Caloric
2) Potential
3) Kinetic
4) Entropic
Potential
When two bodies collide head-on and then continue to travel collectively in the original direction of motion of one of the bodies, what factor determines the direction of collective motion after the collision?
Question options:
1) The relative weights of the two bodies
2) The relative acceleration of the two bodies
3) The relative momenta of the two bodies
4) The relative masses of the two bodies
The relative momenta of the two bodies
Negative mechanical work involves which of the following?
Question options:
1) Net torque and angular motion are in the same direction.
2) Net torque and angular motion are in different directions.
3) Concentric muscle contraction
4) None of the above
Net torque and angular motion are in different directions.
Which of the following mechanical quantities is evident in explosive track and field events, such as the long jump and the shot put?
Question options:
1) Mechanical work
2) Kinetic energy
3) Potential energy
4) Mechanical power
Mechanical power
Which of the following relationships is correct?
Question options:
1) m = F / a
2) F = m / a
3) a = m / F
4) None of the above
m = F / a
Which of the following is/are true statement(s) regarding the law of gravitation?
Question options:
1) All bodies are attracted to one another with a force proportional to the product of their masses.
2) All bodies are attracted to one another with a force inversely proportional to the square of the distance between them.
3) The law of gravitation ceases to exist outside the earth’s atmosphere.
4) Both A & B
5) All of the above
Both A and B
(All bodies are attracted to one another with a force proportional to the product of their masses) & (All bodies are attracted to one another with a force inversely proportional to the square of the distance between them)
The product of a force and the time during which it acts defines which of the following?
Question options:
1) Acceleration
2) Momentum
3) Impulse
4) Velocity
Impulse
The formula for mechanical work is the product of which of the following?
Question options:
1) Power and displacement
2) Force and time
3) Acceleration and time
4) Force and displacement
Force and displacement
Which of the following correctly describes impact?
Question options:
1) Small force applied over a long period of time
2) Large force applied over a long period of time
3) Small force applied over a short period of time
4) Large force applied over a short period of time
Large force applied over a short period of time
The capacity for doing work that a body possesses because of its height or position is called which of the following?
Question options:
1) Mechanical power
2) Kinetic energy
3) Moment of inertia
4) Potential energy
Potential energy
Which of the following is/are correct formula(s) for mechanical power?
Question options:
1) P = W/t
2) P = Fd/t
3) P = Fv
4) All of the above
All of the above
(P = W/t) , (P = Fd/t) , (P = Fv)
In sporting activities, which amount of friction is desired?
Question options:
1) Depends on the situation
2) Large
3) Small
4) None
Depends on the situation
Which of the following would be typical for vertical ground reaction force (GRF) during running?
Question options:
1) GRF = body weight
2) GRF = 2 X body weight
3) GRF = ½ body weight
4) None of the above
GRF = 2 X body weight
Which of the following is a correct unit of mechanical energy?
Question options:
1) kg/m
2) Joules
3) Watts
4) kg-m
Joules
How does wearing gloves increase the friction between the hands and the bat?
Question options:
1) Friction is not increased.
2) Changes R
3) Changes μk
4) Changes μs
Changes μs
The higher the jump, the “harder” the landing. This statement reflects which of the following laws?
Question options:
1) The law of action‐reaction
2) The law of inertia
3) The law of momentum
4) The law of torque
The law of action‐reaction
Which of the following is closest to a perfectly elastic impact?
Question options:
1) Modeling clay dropped on a hard surface
2) Modeling clay dropped on a trampoline
3) Superball dropped on a hard surface
4) Superball dropped on a trampoline
Superball dropped on a hard surface
What defines the product of force and the time during which the force acts?
Question options:
1) Linear velocity
2) Linear impulse
3) Linear momentum
4) Linear acceleration
Linear impulse
Which of the following is a correct unit for linear momentum?
Question options:
1) N·m
2) kg·m/s
3) N·m/s
4) kg·m
kg·m/s
What happens to momentum when an impulse acts on a system?
Question options:
1) Momentum is conserved.
2) Momentum is changed.
3) Impulse does not affect momentum.
4) None of the above.
Momentum is changed.
Which of the following statements is true about the relationship between impact and impulse?
Question options:
1) Impulse is always greater than impact.
2) Impact is always greater than impulse.
3) Impulses generate impacts.
4) Impacts generate impulses.
Impacts generate impulses.
Which of the following quantities would be different on the moon than on the earth?
Question options:
1) Acceleration due to gravity
2) Mass
3) Both A and B
4) None of the above
Acceleration due to gravity
What determines the time a horizontally projected object remains in the air?
Question options:
1) Mass
2) Projection height
3) Weight
4) All of the above
Projection height
The two variables that determine momentum are
Question options:
1) Velocity and time
2) Velocity and mass
3) Mass and acceleration
4) Velocity and acceleration
Velocity and mass
Which of the following factors does not affect the amount of friction generated between two dry surfaces?
Question options:
1) The coefficient of friction between the two surfaces
2) The surface area in contact
3) The reaction force
4) The normal force
The surface area in contact
Which quantity is not a force?
Question options:
1) Weight
2) Friction
3) Mass
4) Gravity
Mass
Which of the following mechanical quantities is NOT dependent on time?
Question options:
1) Velocity
2) Work
3) Kinetic energy
4) Power
Work
Which of the following mechanical quantities is NOT dependent on time?
Question options:
1) Velocity
2) Work
3) Kinetic energy
4) Power
Work
The principle of conservation of momentum restates which of Newton’s laws?
Question options:
1) Acceleration
2) Gravitation
3) Action/reaction
4) Inertia
Inertia
Which of the following affects the coefficient of restitution between a tennis racket and tennis ball?
Question options:
1) How long the ball has been out of the can
2) How many times the ball has been hit
3) Tightness of the grip
4) All of the above
All of the above
(How long the ball has been out of the can) , (How many times the ball has been hit) , (Tightness of the grip)
Which of the following relationships is always true?
Question options:
1) μk < μs
2) μs < μk
3) μk = μs
4) None of the above
μk < μs
Which variable may be described as “the quantity of motion” possessed by an object?
Question options:
1) Velocity
2) Momentum
3) Inertia
4) Force
Momentum
Which of the following statements is true of the amount of horizontal force required to start an object sitting on a horizontal surface in motion?
Question options:
1) It must be greater than the coefficient of static friction.
2) It must be greater than the maximum static friction force.
3) It must be greater than the coefficient of kinetic friction.
It must be greater than the maximum static friction force.
If an object of constant mass travels with a constant velocity, which statement is true?
Question options:
1) Momentum is constant.
2) Acceleration is zero.
3) Both A and B
Both A and B
(Momentum is constant) , (Acceleration is zero)
Which of the following pairs of quantities are expressed in the same units of measure?
Question options:
1) Friction and weight
2) Work and energy
3) Both A & B
4) None of the above
Both A & B
(Friction and weight) , (Work and energy)
Which of the following is true of the coefficient of restitution of a racquetball?
Question options:
1) It depends solely on the type of material of which the ball is made
2) It is a number relating to the elasticity of a ball against a particular surface
3) It depends on the size of the ball as well as the type of material
4) It depends solely on how hard the ball is hit
It is a number relating to the elasticity of a ball against a particular surface
How does adding weight to the back of a pickup increase the friction between the tires and the icy road?
Question options:
1) Changes μs
2) Changes R
3) Friction is not increased.
Changes R
Which of the following is a correct unit of mechanical power?
Question options:
1) Watts
2) kg/m
3) kg-m
Watts
