Dynamics Review

Dynamics Review

Mrs. Felig Physics I & AP Physics I 2020

Newton's Law's of Motion

Multiple Choice

Pushing a child on a swing is easier than pushing an adult on the same swing, because the adult has more mass.

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

• None of them

Multiple Choice

Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction.

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• None of them

Multiple Choice

An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, the lighter truck increases speed more quickly. Which of these best explains this situations

• Newton's first law
• Newton's second law
• Newton's third law
• Conservation of momentum

Multiple Choice

An object will not have any inertia if it is __________?

• Accelerating
• Moving in a circle
• In space
• … Nonsense! All objects have inertia

Multiple Choice

A person steps out of the boat and onto the dock.  As the person moves forward onto the dock, the boat moves backward.  Which statement best describes the backward motion of the boat as the person steps forward?

• For every action there is an equal and opposite reaction.
• Every mass exerts a force on every other mass.
• An object at rest tends to stay at rest.
• Friction opposes the motion of an object.

Multiple Choice

A sled sliding on a flat, icy surface with a constant velocity is best described by

• Newton’s first law of motion for objects at rest.
• Newton’s first law of motion for objects in motion.
• Newton’s second law of motion.
• Newton’s third law of motion.

Multiple Choice

According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will

• remain in motion.
• eventually come to a stop.
• change its momentum.
• accelerate.

Multiple Choice

What law is best described by inertia?

• 1st
• 2nd
• 3rd

Free Body Diagrams & Forces

Multiple Select

This diagram can be used to indicate which of the following? (TWO correct answers)

• a object at rest

• an object moving at a constant velocity (speed)

• an object accelerating

• (Trick question -- there is only one correct answer)

• an object decelerating

Multiple Choice

Which diagram best shows person pushing a couch (accelerating) across the floor?

Multiple Choice

If this object were moving right, the left-arrow in this diagram is most-likely:

• gravity

• normal

• a push or pull

• friction

Multiple Select

This object would be moving (pick all that are correct):

• up

• down

• left

• right

Multiple Choice

What is the NET FORCE of this diagram?

• 17 N, right

• 17 N, left

• 23 N, right

• 12 N, up

Multiple Choice

The force exerted by ropes and chains is called

• tension

• normal

• elastic

• mechanical

Multiple Choice

The force that keeps objects on top of surfaces instead of letting them sink into the surface is known as:

• normal

• abnormal

• static

• inertia

Multiple Choice

If an object is moving to the right, this force is pushing or pulling to the left:

• friction

• applied

• normal

• tension

Multiple Choice

Assuming both objects are at rest, which object is more massive? M1 or M2?

• M1 is more massive
• M2 is more massive
• both M1 and M2 are the same mass

Multiple Choice

A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?

• accelerating upward

• accelerating downward

• moving upward at a constant speed

• moving downward at a constant speed

Multiple Choice

A 80 kg skydiver is free falling at a constant velocity of 19 m/s. What is the net (total) force acting on her?

• 1,520 N
• 0 N
• 4.21 N
• Not enough information to answer

Multiple Choice

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? 

• 0.78
• 0.51
• 0.78 N
• 0.58 N

Multiple Choice

If there is no friction, then the acceleration would be equal to

• mg

• sin(θ)mg

• g

• sin(θ)g

Multiple Choice

Which of the following is not true about the system?

• T₃ is equal to the scalar sum of the magnitudes of T₂ and T₁

• T₃ is equal in magnitude to F_g

• The x- components of the T₁ and T₂ and equivalent but in opposite directions

• The system is in equilibrium.

Multiple Choice

Which of the following statements is true about the image above?

• The accelerations of the blocks will vary according to their mass

• The net force acting on each block is the same

• The blocks will experience the same acceleration

• The 3m box will eat the 2m and the m boxes

Multiple Choice

Camille launches a catapult that changes the velocity of a ball (m= 2 kg) from 0 to 10 m/s in one sec. What is the average force that is exerted on the ball during launch?

• 20 N

• 5 N

• 8 N

• 0.2 N

Multiple Choice

As the angle of the incline increases, what happens to the normal force?

• The normal force increases

• The normal force decreases

• The normal force is not affected by the incline

• The normal force is only dependent on the force due to gravity

Multiple Choice

Refer to the picture to answer the following question. If M = 1kg, what is the tension in the rope? Assume the surface is frictionless.

• F_T = 2.01N

• F_T = 0.67N

• F_T = 2.68N

• F_T = 1.34N

Multiple Choice

Refer to the picture to answer the following question. If M = 1kg, what is the acceleration of the masses? Assume the surface is frictionless.

• a = 1.67m/s²

• a = 0.67m/s²

• a = 2.67m/s²

• a = 1.33m/s²

Multiple Choice

An object sliding across a surface will experience ______ friction.

• static

• potential

• kinetic

• no

Multiple Choice

Rank the tensions experienced by the strings.

• T_A > T_B > T_C

• T_B > T_A = T_C

• T_B > T_C > T_A

• Cannot be determined

Multiple Choice

A block of weight W is pulled along a horizontal surface at constant speed v by a force F, which acts at an angle Θ with the horizontal, as shown. The normal force exerted on the block by the surface has magnitude_____.

• greater than W

• greater than 0 but less than W

• equal to W

• 0