P.1 Quiz #1

Which is the MOST likely needed when describing the change in position of an object?

• initial speed

• direction change

• reference point

• constant rate

The BEST example of balanced forces is...

• car increasing speed

• bus parked in a garage

• ball kicked along a flat surface

• roller coaster slowing down on an incline plane

A jet is moving at a constant velocity on a flat surface. Which forces act against the forward motion of the plane?

• gravity and engine thrust

• engine thrust and friction

• friction and air resistance

• air resistance and gravity

A student reads his paper on friction to the class. Which statement should he include in his paper if he wants to present accurate information?

• Friction increases mechanical advantage.

• Friction opposes the direction of movement.

• Friction makes movement of an object easier.

• Friction reduces the amount of work used to move an object.

Which statement BEST explains why a car that is rolling on a level surface will eventually come to a stop?

• Frictional forces oppose the motion of the car.

• Forward motion slowly runs out as energy is expended.

• The natural state of an object is to be at rest.

• Inertia acting on an object will dissipate.

During class the teacher showed an enlarged image of a small piece of sidewalk. The students saw that the sidewalk was rougher than they had previously thought. Which effect would the rough surface have on a box that is pulled along the sidewalk?

• It would reduce the amount of work that is performed when pulling the box.

• It would oppose the force that is being applied to the box when it is pulled.

• It would decrease the resistance between the forces that are pulling the box.

• It would help reduce the force of gravity when the box is pulled.

A toy car starts at the top of a ramp, rolls down and slows to a stop. Which acts MOST to bring the car to a stop?

• friction

• magnetism

• wind speed

• electrical force

When riding a roller coaster, a electric motor pulls the roller coaster to the top of the first hill. What force pulls the roller coaster down the hill?

• friction

• speed

• gravity

• mass

Two forces act in opposite directions on a wood block. What will happen if the forces are unbalanced?

• The block will balance the forces.

• The forces will reverse direction.

• The mass of the block will change.

• The position of the block will change.

In which of the following cases would a decrease in friction be MOST beneficial?

• the friction between the shoes of a jogger and the jogging track

• the friction between the wheels of a car and the surface of a road

• the friction between a rotating pulley and the axle that supports the pulley

• the friction between a rotating pulley and the rope that is used with the pulley