Ch. 5 Physics HW-CRAT
Apply these steps to the following problem: A crate is pulled up a rough inclined
wood board by a tow rope. Identify the forces on the crate. Which of the following
objects are of interest? - correct answer-crate
Apply these steps to the following problem: A crate is pulled up a rough inclined
wood board by a tow rope. Identify the forces on the crate. Identify the contact forces
exerted on the crate. - correct answer-tension
normal force
kinetic friction
Apply these steps to the following problem: A crate is pulled up a rough inclined
wood board by a tow rope. Identify the forces on the crate. Identify the long-range
forces acting on the crate. - correct answer-gravitational force
A jet plane is speeding down the runway during takeoff. Air resistance is not
negligible, friction is negligible. Identify the forces on the jet. - correct answer-Drag
Gravity Force
Force of Thrust
Normal Force
Apply these steps to the following problem: Your physics book is sliding on the carpet
as shown in (Figure 1). Which forces are acting on the book? - correct answer-kinetic
friction
gravity
normal force
Apply these steps to the following problem: Your physics book is sliding on the carpet
as shown in (Figure 1). Draw the most appropriate set of coordinate axes for this
problem. - correct answer-x goes from far left end and arrow pointing to the right y
goes from the bottom and arrow pointing upward
Apply these steps to the following problem: Your physics book is sliding on the carpet
as shown in (Figure 1). Draw each force vector with its tail centered at the black dot.
The location and orientation of your vectors will be graded. - correct answer-Normal
force: arrow pointing upward
Force of gravity: arrow pointing downward
force of friction arrow pointing towards the left
In the figure (Figure 1) block B is falling and dragging block A across a table. How
many force vectors would be shown on a free-body diagram of block A? - correct
answer-4
, In the figure (Figure 1) block B is falling and dragging block A across a table. Name
these forces. - correct answer-Friction with the surface F⃗ frs
Gravity F⃗ G
Normal force n⃗
Tension T⃗
An object experiencing a constant force accelerates at 10 m/s^2. Drag words or
phrases from each group into the blanks to create a true statement. - correct
answer-If the force is doubled, the object's acceleration will be 20 m / s 2 because
Newton's second law says that the acceleration is directly proportional to the force.
An object experiencing a constant force accelerates at 10 m/s^2. Drag words or
phrases from each group into the blanks to create a true statement. - correct
answer-If the mass is doubled, the object's acceleration will be 5 m / s 2 because
Newton's second law says that the acceleration is inversely proportional to the mass.
An object experiencing a constant force accelerates at 10 m/s^2. Drag words or
phrases from each group into the blanks to create a true statement. - correct
answer-If the force is doubled and the mass is doubled, the object's acceleration will
be 10 m / s 2 because from Newton's second law, the two doublings act in opposite
directions and cancel.
World-class sprinters can accelerate out of the starting blocks with an acceleration
that is nearly horizontal and has magnitude 15m/s2. How much horizontal force F
must a sprinter of mass 61 kg exert on the starting blocks to produce this
acceleration? - correct answer-920N (15m/s2 x 61 kg)
World-class sprinters can accelerate out of the starting blocks with an acceleration
that is nearly horizontal and has magnitude 15m/s2. Which body exerts the force that
propels the sprinter, the blocks or the sprinter? - correct answer-the blocks
An object at rest cannot remain at rest unless which of the following holds? - correct
answer-The net force acting on it is zero.
If there is a net force acting on a body, regardless of whether it is a constant force,
the body accelerates. If the body is at rest and the net force acting on it is zero, then
it will remain at rest. The net force could be zero either because there are no forces
acting on the body at all or because several forces are acting on the body but they all
cancel out.
If a block is moving to the left at a constant velocity, what can one conclude? -
correct answer-The net force applied to the block is zero.
Apply these steps to the following problem: A crate is pulled up a rough inclined
wood board by a tow rope. Identify the forces on the crate. Which of the following
objects are of interest? - correct answer-crate
Apply these steps to the following problem: A crate is pulled up a rough inclined
wood board by a tow rope. Identify the forces on the crate. Identify the contact forces
exerted on the crate. - correct answer-tension
normal force
kinetic friction
Apply these steps to the following problem: A crate is pulled up a rough inclined
wood board by a tow rope. Identify the forces on the crate. Identify the long-range
forces acting on the crate. - correct answer-gravitational force
A jet plane is speeding down the runway during takeoff. Air resistance is not
negligible, friction is negligible. Identify the forces on the jet. - correct answer-Drag
Gravity Force
Force of Thrust
Normal Force
Apply these steps to the following problem: Your physics book is sliding on the carpet
as shown in (Figure 1). Which forces are acting on the book? - correct answer-kinetic
friction
gravity
normal force
Apply these steps to the following problem: Your physics book is sliding on the carpet
as shown in (Figure 1). Draw the most appropriate set of coordinate axes for this
problem. - correct answer-x goes from far left end and arrow pointing to the right y
goes from the bottom and arrow pointing upward
Apply these steps to the following problem: Your physics book is sliding on the carpet
as shown in (Figure 1). Draw each force vector with its tail centered at the black dot.
The location and orientation of your vectors will be graded. - correct answer-Normal
force: arrow pointing upward
Force of gravity: arrow pointing downward
force of friction arrow pointing towards the left
In the figure (Figure 1) block B is falling and dragging block A across a table. How
many force vectors would be shown on a free-body diagram of block A? - correct
answer-4
, In the figure (Figure 1) block B is falling and dragging block A across a table. Name
these forces. - correct answer-Friction with the surface F⃗ frs
Gravity F⃗ G
Normal force n⃗
Tension T⃗
An object experiencing a constant force accelerates at 10 m/s^2. Drag words or
phrases from each group into the blanks to create a true statement. - correct
answer-If the force is doubled, the object's acceleration will be 20 m / s 2 because
Newton's second law says that the acceleration is directly proportional to the force.
An object experiencing a constant force accelerates at 10 m/s^2. Drag words or
phrases from each group into the blanks to create a true statement. - correct
answer-If the mass is doubled, the object's acceleration will be 5 m / s 2 because
Newton's second law says that the acceleration is inversely proportional to the mass.
An object experiencing a constant force accelerates at 10 m/s^2. Drag words or
phrases from each group into the blanks to create a true statement. - correct
answer-If the force is doubled and the mass is doubled, the object's acceleration will
be 10 m / s 2 because from Newton's second law, the two doublings act in opposite
directions and cancel.
World-class sprinters can accelerate out of the starting blocks with an acceleration
that is nearly horizontal and has magnitude 15m/s2. How much horizontal force F
must a sprinter of mass 61 kg exert on the starting blocks to produce this
acceleration? - correct answer-920N (15m/s2 x 61 kg)
World-class sprinters can accelerate out of the starting blocks with an acceleration
that is nearly horizontal and has magnitude 15m/s2. Which body exerts the force that
propels the sprinter, the blocks or the sprinter? - correct answer-the blocks
An object at rest cannot remain at rest unless which of the following holds? - correct
answer-The net force acting on it is zero.
If there is a net force acting on a body, regardless of whether it is a constant force,
the body accelerates. If the body is at rest and the net force acting on it is zero, then
it will remain at rest. The net force could be zero either because there are no forces
acting on the body at all or because several forces are acting on the body but they all
cancel out.
If a block is moving to the left at a constant velocity, what can one conclude? -
correct answer-The net force applied to the block is zero.
