Friction in Biomechanics: Types, Factors, and Applications

Question 1

Which of the following factors increases the coefficient of friction?

Accepted Answer

High normal force

Answer

Smooth surfaces

Answer

Lubrication

Question 2

What is the unit of measurement for the coefficient of friction?

Accepted Answer

Unitless

Answer

Newtons

Question 3

What is the primary factor that influences the magnitude of static friction?

Accepted Answer

Normal force

Answer

Surface texture

Answer

Speed of the object

Answer

Temperature

Question 4

What is the definition of the coefficient of friction?

Accepted Answer

The ratio of friction force to normal force

Answer

The ratio of static friction to kinetic friction

Answer

The ratio of kinetic friction to static friction

Answer

The ratio of normal force to friction force

Question 5

The coefficient of friction is described as a:

Accepted Answer

Dimensionless quantity that represents the ratio of friction force to normal force.

Answer

Angle at which an object slides on an inclined surface.

Answer

Force required to move an object from rest.

Answer

Distance traveled before an object stops sliding.

Question 6

Identify an example of static friction.

Accepted Answer

A book placed on a horizontal surface.

Answer

A ball bouncing on the ground.

Answer

A skier moving down a slope.

Answer

A car rolling downhill.

Question 7

A coefficient of friction of 0.5 between two surfaces indicates that:

Accepted Answer

For every 5 N of normal force applied, 2.5 N of friction force is generated.

Answer

The surfaces are exceptionally smooth.

Answer

The friction force is always greater than the normal force.

Question 8

Which of the following is an application of rolling friction?

Accepted Answer

Ball bearings

Answer

Seatbelts

Answer

Brake pads

Answer

Sandpaper

Question 9

The force that resists relative motion between two surfaces in contact is called:

Accepted Answer

Friction

Answer

Normal force

Answer

Tension

Answer

Gravity

Question 10

Which of the following applications of friction is used to enhance the grip of footwear?

Accepted Answer

Tread patterns

Answer

Lubrication

Answer

Vacuum

Answer

Electrostatic charge

Question 11

The coefficient of friction is a:

Accepted Answer

Dimensionless quantity

Answer

Vector quantity

Answer

Scaled quantity

Answer

Unit vector

Question 12

Which of the following scenarios demonstrates sliding friction?

Accepted Answer

A sled sliding on snow

Answer

A liquid flowing through a pipe

Answer

A ball rolling on a surface

Answer

A tire rotating on pavement

Question 13

The force required to initiate motion against friction is:

Accepted Answer

Greater than the force required to maintain motion

Answer

Less than the force required to maintain motion

Answer

Equal to the force required to maintain motion

Question 14

Which surface type generally provides the highest coefficient of friction?

Accepted Answer

Rough surface

Answer

Wet surface

Answer

Smooth surface

Answer

Icy surface

Question 15

Friction is classified as a conservative force.

Accepted Answer

False

Answer

Sometimes true, sometimes false

Answer

True

Answer

Not applicable

Question 16

Friction originates from:

Accepted Answer

Intermolecular forces between the contacting surfaces

Answer

Air resistance

Answer

Inertia

Answer

Gravity

Question 17

Between sliding and rolling friction, which is invariably greater?

Accepted Answer

Sliding friction

Answer

It depends on the surfaces involved

Answer

Rolling friction

Answer

Both are equal

Question 18

Which of the following exemplifies fluid friction?

Accepted Answer

A car traveling through air

Answer

A rope against a rock surface while climbing

Answer

A ball rolling on a flat surface

Answer

A book sliding on a table

Question 19

In everyday situations, friction can be both beneficial and detrimental. Which of the following demonstrates a beneficial use of friction?

Accepted Answer

Preventing a car from skidding on wet roads

Answer

Increasing the difficulty of walking on ice

Answer

Making it difficult to open a jammed door

Answer

Causing wear and tear on moving parts

Question 20

The coefficient of friction is a dimensionless quantity that:

Accepted Answer

Quantifies the amount of friction between two surfaces

Answer

Measures the force required to move an object

Answer

Indicates the angle at which an object will slide

Question 21

Which approach is commonly used to reduce friction?

Accepted Answer

Using lubricants

Answer

Applying external pressure

Answer

Changing the angle of contact

Answer

Increasing surface roughness

Question 22

A cyclist applies their brakes, causing the bike to slow down. Which factor primarily determines the magnitude of the friction force acting on the bike?

Accepted Answer

The coefficient of friction between the brake pads and the wheel rim.

Answer

The speed of the bike.

Answer

The wind resistance acting on the bike.

Answer

The weight of the bike.

Question 23

A long jumper experiences resistance as they move through the air. This type of friction is referred to as:

Accepted Answer

Fluid friction

Answer

Rolling friction

Answer

Static friction

Question 24

A swimmer experiences increased resistance as they swim faster. This is an example of:

Accepted Answer

Fluid friction increasing with velocity.

Answer

Rolling friction caused by water.

Answer

The swimmer's weight increasing with speed.

Answer

Static friction acting on the swimmer.

Question 25

Why do athletes use special shoes with spikes for track and field events?

Accepted Answer

To increase friction and improve traction.

Answer

For aesthetic purposes.

Answer

To reduce friction and improve speed.

Answer

To decrease air resistance.

Question 26

A tennis player hits a ball that bounces off the court. What type of friction acts between the ball and the court during the bounce?

Accepted Answer

Kinetic friction

Answer

Fluid friction

Answer

Static friction

Question 27

A skier glides down a slope. How can they reduce friction to increase their speed?

Accepted Answer

Use smoother skis and wax them regularly.

Answer

Increase their weight to create more friction.

Answer

Turn more frequently to increase air resistance.

Answer

Use rougher skis for better grip.

Question 28

Which of the following is a benefit of friction in sports?

Accepted Answer

Improved grip for athletes.

Answer

Increased rolling resistance for wheels.

Answer

Reduced stability for standing.

Answer

Increased air resistance during running.

Question 29

A golfer swings their club. What type of friction primarily acts between the club and the ball?

Accepted Answer

Kinetic friction

Answer

Rolling friction

Answer

Fluid friction

Answer

Static friction

Question 30

A basketball player dribbles the ball. How can they manipulate friction to control the ball's bounce?

Accepted Answer

By adjusting the force applied to the ball, changing the amount of friction between their hand and the ball.

Answer

By changing the ball's shape, reducing the surface area.

Answer

By changing the ball's weight, altering the friction.