For a bicyclist rounding a curve, centrifugal force is created by the friction f

Question

For a bicyclist rounding a curve, centrifugal force is created by the friction force of the tires and centripetal force is created by the ground reaction friction force.

True

False

1 points

Question 38

If angular velocity is constant, decreasing the radius of rotation will result in greater linear velocity.

True

False

1 points

Question 39

If work is constant, power increases as time increases.

True

False

1 points

Question 40

In almost all sport activities, the performer relies on angular motion preceding the release in order to obtain a specified linear or tangential velocity.

True

False

1 points

Question 41

The higher the coefficient of friction, the greater the tendency to slide. (higher coefficient of friction indicates less friction)

True

False

1 points

Question 42

A higher friction force means it will be easier to push the object.

True

False

1 points

Question 43

As mass and/or velocity increases, centripetal force decreases.

True

False

1 points

Question 44

The moment of inertia in angular kinematics or kinetics corresponds to mass in linear kinematics or kinetics.

True

False

1 points

Question 45

Rolling friction is less than sliding friction.

True

False

Explanation / Answer

True

Turning on a bike requires a net force called centripetal force. The frictional force provides the centripetal force necessary to turn the cyclist to the left.

Question 38:

Flase

Power = Work ÷ time.

Hence power is inversely proportion to time. Thus when work is constant, as power increases time decreases

Question 39

False

Linear velocity, in a circular path, increases with the increase in radius and decreases with the decrease in radius. Hence, the angular velocity remains the same no matter what the change in radius is (W=V/r).Thus concludes decreasing the radius of rotation will result in decrease in linear velocity.

Question 40:

True

Body Segment rotations combine to produce linear motion of the whole body.

Ex: Rotation of wheels results in linear motion of the bicyclist and his bike.

Question 41:

False

Friction is the oppositional force to motion between two surfaces in contact.

The coefficient of ice is relatively low and much less than one. A system with a low coefficient of friction has a low resistance to the surfaces sliding across one another. The fact that ice has a low coefficient of friction can be seen easily by pushing someone across an ice-skating rink.

Hence higher the coefficient of friction, the lesser the tendency to slide.

Question 42:

False

When Frictional force is equal to applied force in that conditions body doesn’t move.

If applied force is greater body moves in the direction of force applied.

If fractional force is greater than applied force, then the body will begin to accelerate in the direction of the frictional force.

Thus concludes more force needs to be applied when frictional force is higher.

Question 43:

False

The centripetal force is needed to keep an object moving in a circle.

If the mass of the object increases the centripetal force increases.

Question 44:

True

Question 45:

True.

Rolling friction must always be less than sliding friction, because in order for an object to Roll, the force of friction between it and the surface must be large enough to keep the object from silding.

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