c. What is the reaction force (type, direction, and object) corresponding to the rope pulling the trunk to the right? Give type of force, the direction of the reaction force, and what object the reaction force acts on. d. What is the reaction force corresponding to the Earth pulling down on the trunk? e. What is the reaction force corresponding to the force that prevents the trunk from sliding?
c. What is the reaction force (type, direction, and object) corresponding to the rope pulling the trunk to the right? Give type of force, the direction of the reaction force, and what object the reaction force acts on. d. What is the reaction force corresponding to the Earth pulling down on the trunk? e. What is the reaction force corresponding to the force that prevents the trunk from sliding?
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Transcribed Image Text:c. What is the reaction force (type, direction, and object) corresponding to
the rope pulling the trunk to the right? Give type of force, the direction
of the reaction force, and what object the reaction force acts on.
d. What is the reaction force corresponding to the Earth pulling down on the trunk?
e. What is the reaction force corresponding to the force that prevents the trunk from sliding?
f. The purpose of drawing the free body diagram is to use it when we write out Newton's 2nd law. Why are the
reaction forces not included in the free body diagram for the trunk?
Transcribed Image Text:Tension: The force with which a string or rope pulls on an object is called the tension. This force always pulls along the direction
of the string.
Kinetic (Sliding) Friction: This force acts when two surfaces slide against each other. The force along the surface and is
opposite the direction of relative sliding.
Static Friction: This force may act when two surfaces are in contact without sliding relative to each other. The force is along the
surface and has the direction and magnitude needed to keep the surfaces from sliding against each other. It is often difficult to
determine the direction of this force.
Free Body Diagrams
To apply Newton's 2 law, you must correctly identify all the forces without overlooking any or adding any forces that
do not act directly on the object. To do so, we will draw a "free body diagram" (FBD) which represent each outside force
acting on an object by a labeled arrow. The labels represent the magnitude of the force, for example, "F" for the
normal force.
2. A tennis ball of mass M is moving as shown after it has been struck
by a racquet. Draw the free body diagram showing the forces acting
on the ball. Assume air friction is negligible.
3. A trunk of mass Mis on a ramp. A rope pulls on the trunk horizontally as
shown but the trunk does not move.
a. In the box provided, draw a labeled "free body diagram" (FBD) showing
all the forces acting on the trunk. All the forces in the diagram should
have descriptive labels giving the name of the force, for example, "Tor
"F" for the tension. Do not label the weight as "g" - this is the
acceleration due to gravity and is not a force. Label the weight as "F",
"W", or "Mg".
Newton's 3" law says that all forces come in action-reaction pairs, i.e., if
object A exerts a force on B, object B must exert the same force on A but in
the opposite direction. Note that action-reaction pairs always must be the
same type of force.
b. What is the reaction force corresponding to the ramp pushing into the
trunk? What type of force is it? What direction is the reaction force
and what object does the reaction force act on?
FBD
FBD
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