샘플 퀴즈

What was the ancient Greek philosophers' strongest argument for giving greater credence to reason rather than to experimentation?

Who inductively suggested the idea of inertia?

The SI unit of force is the

Which is an example of a system on which unbalanced forces act?

The force that acts with one or more other forces to produce mechanical equilibrium is called the

A radiometer is an instrument that consists of a glass bulb containing tiny metal plates attached to an axle. These metal plates rotate when light strikes them. What type of force makes the plates rotate?

Which of the following is not a mechanical force?

When you pull a glazed sheet of paper from underneath a neatly stacked pile of coins, the coins remain stacked afterward. Which of Newton's three laws does this exhibit?

A force of 15.0 N gives an object an acceleration of 7.50 m/s. What force would be needed to give it an acceleration of 2.0 m/s'?

When you push on a heavy, immovable boulder, the boulder also pushes on you. This is an example of which of Newton's laws?

The kick from the firing of a high-powered rifle illustrates which of Newton's laws?

Acceleration can be calculated by

What is the mass of a 5000 N car?

T/F Scientific laws hold in every case in which they are tested.

T/F In the absence of air resistance, all objects fall at the same rate.

T/F Newton was the first person to assert the concept of inertia.

T/F Forces always cause a change in motion.

T/F A spring scale is an example of an instrument used to measure forces.

T/F Newton's first law of motion predicts that without unbalanced forces, moving objects will travel in straight lines.

T/F Under ideal conditions, an object needs a continuous push to maintain a constant velocity.

T/F The action and reaction pairs act on the same system.

T/F Forces can occur only in pairs.

T/F The weight of an object on Pluto is the same as its weight on Earth.

T/F A triple-beam balance measures the weight of an object.

For what phenomena do Newton's laws of motion not always hold true?

Pushes and pulls are simple descriptions for the phenomena physicists call ____________.

The force of gravity acting on a mass is its _________________.

The force-like interactions between subatomic particles within an atom's nucleus are called __________________.

The primary mechanical force transmitted through a tug-of-war rope is _____________.

The system of mathematics used to describe and explain noncontact forces is called _______________.

Newton's laws of motion are the basis for the area of physies known as ___________________.

When the vector sum of all forces on a system is zero, the system is said to be in ___________________________.

If the external force acting on a body of constant mass is halved, its acceleration is ________________.

Naval architects use an arresting wire system on an aircraft carrier to stop landing aircraft because this system ___________________ the amount of time the stopping force is applied, and thus _________________ its magnitude on the pilot and aircraft.

The English Engineering System (EES) unit for weight is the __________________.

The symbol for the SI unit of angular speed is

If a girl's speed on a merry-go-round is constant, the girl's instantaneous acceleration is

In an accelerated reference frame, which of the vectors is not perpendicular to centripetal acceleration at any given instant?

What is the acceleration of a car moving at a constant 25.0 m/s on a curved entrance ramp to an interstate? The ramp's curve has a radius of 45.0 m.

Angular acceleration only applies to systems in which

The force needed to keep a body moving in a circular path is

Which statement about torque is not true?

Which scientist did not hold to the heliocentric theory?

Kepler's first law of planetary motion

The symbol G in the formula for Newton's law of gravitation is

Which is not true about Cavendish's experiment?

T/F The direction of an object's tangential velocity, vt, is perpendicular to its position vector, r.

T/F If the magnitude of the tangential velocity on a merry-go-round is constant, then the centripetal acceleration vector must also be constant.

T/F The formula relating centripetal acceleration, tangential velocity, and the radius of motion is a vector formula.

T/F Angular speed is measured in the plane of rotation, but angular velocity is oriented perpendicular to the plane of rotation.

T/F Angular velocity and angular acceleration are parallel and always have opposite directions.

T/F If a force producing a moment is applied parallel to the moment arm, then the torque is at a maximum.

T/F With a few notable exceptions, most ancient philosophers and scientists held to the geocentric theory.

T/F The closer a satellite is to the earth, the faster the satellite revolves in its orbit.

T/F Kepler's constant, K, is the same for Saturn's moon Titan as it is for all of our solar system's planets, asteroids, and comets.

T/F The effects of gravity can be observed even between common-sized objects.

T/F Calculations of the density of the earth led to a better understanding of the structure of the earth's interior.

The SI unit for angular measure is the ________________.

In circular motion, position vectors and velocity vectors are ___________________ to one another.

The rate of change of angular speed with respect to time is called ________________.

The change in the angle of circular motion is analogous to _____________________ in linear motion.

The force on a revolving object that causes it to accelerate is ______________________.

The vector quantity that causes rotational acceleration of a rigid system is called _____________________.

Ptolemy added the concept of _____________ to Aristotle's model to explain retrograde motion.

The observation that a solar system body moves in its orbit at varying speeds depending on its distance from the sun is Kepler's ______________ law.

The scientist who calculated the density of the earth was _________________________.

The time it takes for one heavenly body to make one complete revolution around another heavenly body is called its ________________.

At the top of a loop of a roller coaster, the centripetal force is caused by ______________.

An ideal string acting on a block

Which of the following is not a characteristic of an ideal pulley?

The normal force

A 35.0 kg child steps on a scale at a doctor's office. What does the scale read?

The apparent weight is

Which statement about friction is true?

The coefficient of friction

Which statement about kinetic friction is not true?

Which force does not affect a hiker resting on the incline of a mountain?

Which statement about kinetic friction is true?

Which type of friction is involved in the motionless tires of a car parked on a hill?

Which statement is true about rolling friction?

How do Jersey barriers minimize injuries and damage due to car accidents?

T/F In a free-body diagram, forces that a system is exerting are not shown.

T/F If a free-body diagram consists of a system of two hanging blocks, one hanging from the other, and the top block is hanging from a fixed surface, then there are only two forces acting on the system.

T/F In a system of six blocks of equal mass hung one from the other, the bottom block experiences less than the top block when the system experiences an upward acceleration.

T/F For an object resting on an incline, the normal force is equal in magnitude to the X-component of the weight of the object.

T/F On a level surface, the normal force and the force of gravity acting on an object are equal vectors.

T/F Gravity does not affect an astronaut performing experiments at the International Space Station.

T/F Weight does not affect friction.

T/F The coefficient of friction is a scalar quantity.

T/F The equation for kinetic friction is a vector equation.

T/F The values of static friction can vary for any given material.

T/F It usually requires more force to get a car to start moving than it does to keep it moving.

The only force besides gravity affecting a hanging block is ________________.

An ideal string does not affect a block's acceleration due to gravity because ____________________________________.

The magnitude of the vertical component of gravity for an object resting on a flat surface is ________________ the normal force in magnitude.

The force that keeps you from falling to the floor when you sit in a chair is the ________________.

When an object accelerates in an upward direction, apparent weight ___________________.

When is apparent weight not equal to actual weight? __________________________________

The frictional quantity that is characteristic of two surfaces in contact is the ___________________________________.

When a car skids to a stop, the predominant form of friction slowing the car is _______________.

One of the forces that act on a locomotive that starts from rest to climb a hill is ______________________.