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WorksheetsPHY 34 - Drag, Friction, and Elasticity
Total questions: 20
Worksheet time: 10mins
It is a force that opposes relative motion between surfaces in contact.
Friction
Tension
Normal Force
Gravity
Applied Force
Friction acts ____________ to the surface between surfaces and always _____________ the direction of motion
parallel; opposite to
perpendicular; opposite to
parallel; the same to
perpendicular; the same to
cross; perpendicular to
If two surfaces are in contact and moving relative to one another, then the friction between them is __________________
kinetic friction
static friction
potential friction
rolling friction
Kinetic friction is usually greater than the static friction between the surfaces.
False
True
Friction is proportional to the normal force but not to the area in contact.
False
True
Which of the following shows the relationship of drag force (FD) and speed of the object?
FD is proportional to v2
FD is inversely proportional to v2
FD is proportional to v
FD is inversely proportional to v
FD is equal to v2
Which of the following receives the lowest drag force, provided that other variables are the same?
Toyota Camry (C = 0.28)
Honda Civic (C = 0.36)
Ferrari (C = 0.37)
Hummer H2 SUV (C = 0.64)
In which surface system would an object easier to move?
Wood on wood (μs = 0.55, μk = 0.35)
Metal on wood (μs = 0.50, μk = 0.30)
Steel on steel (μs = 0.6, μk = 0.3)
Rubber on dry concrete (μs = 1.0, μk = 0.7)
Steel on Ice (μs = 0.04, μk = 0.02)
A skydiver falling through air reaches a constant velocity which is called as ____________________.
terminal velocity
terminal force
tangent velocity
drag velocity
average velocity
The terminal velocity of an object was achieved when
drag force balances the gravity.
drag force is larger than gravity.
drag force is less than the gravity.
when drag force is zero.
gravity is zero.
To decrease the terminal velocity of a skydiver, what would he do?
Descend head first so his area is small.
Descend in a spread-eagle position so his area increases.
Maintain its position throughout his descend.
Detach baggage to lessen its weight.
A change in shape due to the application of a force is called ________________.
deformation
elongation
suspension
tension
motion
The object returns to its original shape when the force is removed—that is, the deformation is inelastic for small deformations
False
True
The size of the deformation is proportional to the force—that is, for small deformations.
False
True
It is the breaking stress that will cause permanent deformation or fracture of a material.
Tensile Strength
Breaking Point
Stress
Strain
Shear Deformation
It is the ratio of force to area.
Tensile Strength
Breaking Point
Stress
Strain
Shear Deformation
It is the ratio of change in length to the original length.
Tensile Strength
Breaking Point
Stress
Strain
Shear Deformation
It is the deformation perpendicular to the original length of an object.
Tensile Strength
Shear Deformation
Stress
Strain
Breaking Point
A ball is dropped from rest and feels air resistance as it falls and the drag force increases. What happens to its net force?
It is decreasing
It is increasing
It is constant.
It is zero.
A ball is dropped from rest and feels air resistance as it falls and the drag force increases. What happens to its acceleration?
It is decreasing
It is increasing
It is constant.
It is zero.
