Mechanics Test Review

Mechanics Test Review

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Multiple Choice

Gravity is ____.

• a force that attracts objects towards each other

• a force that moves objects away

• a push or pull

Multiple Choice

what force is applied on the book by the table.(represented by R)

• normal reaction

• friction force

• magnetic force

Multiple Choice

what is the force acting in the ropes of the swing?

• tension

• normal reaction

• friction

• gravitation

Multiple Select

select the examples of contact forces.(tick mark the answers)

• normal reaction

• tension

• friction force

• gravitational force

• Applied Force

Multiple Choice

Based on this free-body diagram, which statement can you be sure is true?

• This object is not moving

• This object is moving to the right

• This object is accelerating to the left

• This object is accelerating to the right

Multiple Choice

Based on the free-body diagram, which statement is true?

• The object is moving to the left

• The object is accelerating to the right

• The object is accelerating to the left

• The object is moving to the right

Multiple Choice

Which free body diagram is correct for a car being pulled at a constant velocity?

• A

• B

• C

• D

• E

Multiple Choice

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

Multiple Choice

Which law best explains why the boat moves in the opposite direction that Sally moves as she jumps to shore?

• Newton's Law of Inertia

• Newton's Law of F=ma

• Newton's Law of Action/Reaction

• Newton's Law of Chemistry

Multiple Choice

Which one of Newton’s Laws of Motion best explains why the dishes do not move when the table cloth is removed?

• Newton's Law of Inertia
• Newton's Law of F=ma
• Newton's Law of Force Pairs
• Newton's Law of Biology

Multiple Choice

Which has more inertia--

• Truck
• Cat
• Ant
• Skateboard

Multiple Choice

What is Newton's Third Law of Motion?

• Object in motion stays in motion and an object at rest stays at rest unless acted on by an unbalanced force
• Force = m x a
• For every action there is an equal and opposite reaction

Multiple Choice

What is Newton's First Law of Motion?

• F = m x a

• Every action has an equal an opposite reaction

• An object at rests stays, an object in motion stays in motion

• Friction

Multiple Choice

What is the NET FORCE of this diagram?

• 17 N, right

• 17 N, left

• 23 N, right

• 12 N, up

Multiple Choice

If F is force, k is spring constant and x is extension, Hooke's Law tells us that:

• F = k/x

• x = Fk

• k = Fx

• F = -kx

Multiple Choice

A spring extends 1.5m under load 10N. What is its spring constant?

• 0.15N/m
• 10N/m
• 6.7N/m
• 15N/m

Multiple Choice

A spring has a spring constant of 5N/cm.  What is its extension when loaded with 15N?

• 4cm
• 5cm
• 3m
• 3cm

Multiple Choice

Friction _____________ motion

• Works in the same direction as

• Opposes

• Has not effect on

• Pulls against

Multiple Choice

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box? 

• 81 N
• 18 N
• 98 N
• 74 N

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

Find the friction coefficient if F_N=100N, F_f=20N

• μ=5.0

• μ=0.2

• μ=1.2

• μ=0.1

Multiple Choice

You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch?

• 60 N right

• 10 N left

• 50 N right

• 50 N left

Multiple Choice

What is the y component of the vector given in the diagram?

• 77N
• 92N
• 120N
• 60N

Multiple Choice

2 forces: 32N and 45 N with angle between of 90 deg. Determine the magnitude of the resultant.

• 3049

• 77

• 8.8

• 55.2

Multiple Choice

2 forces: 32N and 45 N with angle between of 90 deg. Determine the direction of the resultant.

• 90 degrees towards 32N

• 56.4 degrees away from 32N

• 35.4 degrees towards 45N

• 90 degrees away from 45N