Physics MidTerm Study Guide

The normal force is the ______________ force exerted by a surface on another object.

C. ) perpendicular contact

The velocity vector for an object in uniform circular motion is __________.

C. ) tangential to the circle

How far does an object in uniform motion travel during one period?

2pi•r

The law of cosines is ___________.

A. ) R^2 = A^2 + B^2 - 2AB cos theta

Average acceleration is the same as instantaneous acceleration when ______________.

A. ) acceleration is constant

A graphical representation of a displacement vector of distance d had its tail at the origin of a coordinate system and makes an angle of 30* with the positive x-axis. The x component of the vector is ___________.

A. ) d cos 30*

According to Newton's _____________ law, an object with no net force acting on it remains at rest or in motion with a constant velocity.

A. ) first

Mass and weight are related by _____________.

A. ) the gravitational force

In a strobe photo of a dropped egg, the displacement between each pair of images increases. This shows that ______________. Let down b the positive direction.

A. ) the velocity is increasing

Position-time graphs can be used to find the __________ of an object, as well as where and when two objects meet.

A. ) velocity and position

The gravitational force exerted by a large object, such as earth, is _________.

A. ) weight

An object at rest on a horizontal surface has a weight of 200N. In order to move the box a minimum force of 20N is required. The coefficient of static friction is __________.

B. ) 0.10

Which of the following results in the largest acceleration?

B. ) a large change in velocity over a short time interval

For a receiver to catch a football at chest level, the quarterback must aim the football _____________ the receiver's chest.

B. ) above

According to Kepler's first law, the path a planet follows around the sun is an __________.

B. ) ellipse

The _______________ is not shown on a motion diagram.

B. ) exact location of an object

An object's velocity is how fast it is moving and ______________.

B. ) in what direction it is moving

For most surfaces, the coefficient of static friction is ____________ the coefficient of kinetic friction.

B. ) more than

Moving faster as you pedal your bicycle harder on a level road demonstrates Newton's ____________ law.

B. ) second

A vector A has x- and y- components A^x and A^y. The angle the vector makes with the x-axis is ____________.

B. ) tan^1 A^y/A^x

The force exerted by any segment of a string or rope on an adjoining segment is _____________.

B. ) tension

An object is at equilibrium if ___________.

B. ) the net force on it is zero

An object in uniform circular motion has an acceleration that is _____________.

B. ) toward the center of the circle

The force of kinetic friction between a box sliding in a surface depends on the ______________.

C. ) normal force

The equilibrant of a 40N force acting on an object to the right and a 30N force acting on the object to the left is __________.

C. ) 10 N acting to the left

The resultant of a 20N force acting on an object to the right and a 30N force acting on an object to the left is ___________.

C. ) 10 N acting to the left

In the particle model, the object in the motion diagram is replaced by ___________.

C. ) a series of single points

When adding vectors graphically, one does all of the following steps except ________.

C. ) add the components

The length of velocity vectors on a motion diagram increase the same amount with each successive dot. Describe the object's motion.

C. ) constant acceleration

If you push against a wall, the wall pushes back against you with ___________ force.

C. ) equal

Neglecting air resistance, the initial horizontal velocity of a projectile is __________ its final horizontal velocity.

C. ) equal to

Kepler's first law states that the Sun is located at one _________ of a planet's orbit.

C. ) focus

The horizontal and vertical components of a projectile's velocity are __________.

C. ) independent of each other

When the drag force on an object equals the gravitational force, the object attains _____________.

C. ) terminal velocity

The force exerted by a fluid on an object moving through the fluid is __________.

C. ) the drag force

The graphical representation of a vector has its tail at the origin of a two-dimensional coordinate system. Both the horizontal and vertical components are negative. The tip of the vector lies in the ______________ quadrant.

C. ) third

The length of the displacement vector represents how far an object _____________.

C. ) traveled in one direction

If you close your eyes and feel as if you are not moving, you may be experiencing ______________.

C. ) uniform motion

When a problem has multiple frames of reference, ____________ is used to determine relative velocity.

C. ) vector addition

The slope of an object's position-time graph is the __________ of the object.

C. ) velocity

The area under a velocity-time graph is equal to the object's ___________.

D. ) displacement

As velocity increases, an objects displacement ___________.

D. ) increases for each time interval

The average speed is _____________ the average velocity.

D. ) the absolute value of

Changing velocity on a motion diagram is shown using ___________.

D. ) the length of the velocity vectors

A projectile's horizontal acceleration after that projectile is fired is ____________.

D. ) zero

A time interval is the difference between two locations.

False

A toy rocket is launched vertically upward. When the rocket reaches its highest point, it's velocity is at its maximum.

False

A vector has both location and direction.

False

The free-fall acceleration on earth is 9.8 m/s^2 in any direction.

False

The zero point in a coordinate system is called the resultant.

False

Velocity-time graphs can be used to find the velocity and position of an object.

False

When a child drops a ball, the instantaneous acceleration of the ball as the child lets go is zero.

False

When the vectors for acceleration and velocity are pointing in opposite directions, an object is speeding up.

False

A scalar is a measurement that does not have a direction.

True

Acceleration vectors show the magnitude and direction of the average acceleration during a time interval.

True

In the particle model, the object in motion is represented by a series of single points.

True

You can use equations for motion with constant acceleration to solve problems involving objects in free fall.

True