# Review of Dynamics

### Review Test

Who provided a basis for the study of dynamics?

What are the units of force, in terms of fundamental units?

Inertia is the tendency of an object to remain at constant

Which of the following constitutes an inertial reference frame?

What is the weight on earth of a 50 kg person?

What is the weight of a 50 kg person in outer space?

In what way are force and acceleration related?

A 10 kg mass experiences a force of 20 N. What is its acceleration?

An object with mass 2 kg moves with a velocity of 10 m/s. What is the net force on the body?

What are the units of weight, in terms of fundamental units?

An object of mass 1 kg experiences two equal and opposite forces, each of 10 N. What is its acceleration?

A force of 3 N and a force of 4 N act together to produce a resultant force of 5 N. What must be the angle between them?

The net force from two distinct forces is at a maximum when the angle between them is

Three forces, each separated from one another by 120 o yield a net force of 0. What can be said about the magnitude of the forces?

An object is said to be at equilibrium if

A man pushes on a 10 kg crate with a force of 50 N. What force does the man experience?

What is constant for a freely falling object?

The acceleration due to gravity on the moon is 1/6 the value of that on earth. What is the weight of a 100 kg man on the moon?

Which of Newton's Laws relate the force of two mutually interacting bodies?

Which of Newton's Laws define the concept of inertia?

Two surfaces are in contact. The normal force between them always points

A 10 kg mass rests on an inclined plane with angle of elevation of θ . What is the magnitude of the normal force?

The normal force is a direct consequence of which of Newton's Laws?

Frictional force is the result of what kind of fundamental force?

Frictional force always acts in what direction relative to the motion of one body relative to the other?

A 10 kg block is at rest on a horizontal table. The coefficient of static friction between them is .5. What is the frictional force acting upon the block?

A 10 kg block lies at rest on a table, with a coefficient of static friction between them of .5. A horizontal force is then applied of magnitude 50 N. What is the frictional force acting upon the block after the force is applied?

The coefficient of static friction is related to the coefficient of kinetic friction in what way?

A block moves across a tabletop with a certain speed and experiences a kinetic frictional force. What happens to the frictional force when the speed of the block is doubled?

A 10 kg block lies at rest on table. The coefficient of static friction and the coefficient of kinetic friction between the block and the table are .5 and .25 respectively. A 50 N force is applied horizontally to the block. What is the magnitude of the frictional force applied to the block?

See the above problem. What is the acceleration of the block while the force is being applied, in m/s 2 ?

Kinetic frictional force is always directly proportional to what other force?

A 2 kg block is moving with constant velocity across a table with a coefficient of kinetic friction of .5. How much external force is being applied to the block?

The net force on a massless rope is always

A 10 kg block is held in equilibrium by a rope hanging vertically from the ceiling. What is the tension in the rope?

A man attaches a rope to a 20 kg block, pulling it across a floor with constant velocity. The coefficient of kinetic friction between the block and the floor is .5. What is the tension in the rope?

A cube has sides of area 2 cm 2 , 3 cm 2 and 4 cm 2 . What side of the cube will experience the least friction when moved across a rough surface?

A 10 kg block is placed on a floor, but attached to a rope via a pulley system. A person pulls on the rope until the tension in the rope is 90 N. What is the normal force exerted by the floor at this point?

If the normal force between two surfaces is doubled, the coefficient of static friction will

A 10 kg block is pushed horizontally against a vertical wall, with coefficient of static friction of .25 between the block and the wall. With what force must the block be pushed against the wall in order to keep the block from falling?

When traveling in uniform circular motion, all of the following stay constant EXCEPT

When moving in uniform circular motion, the acceleration of a particle is always

A particle is accelerated in uniform circular motion at a rate of 2 m/s 2 , around a circle of radius of 18 m. What is the particle's speed, in m/s?

A 10 m rope has a maximum tension of 20 N. What is the most mass it can keep in uniform circular motion at a velocity of 10 m/s?

Centripetal force always points in what direction?

When a car goes around a curve, the centripetal force is provided by

Which of the following is NOT an example of uniform circular motion?

How much must the centripetal force change if the speed around a circle is doubled?

How much must the centripetal force change if the radius of the circle is doubled?

Which of Newton's Laws do NOT apply to uniform circular motion?

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