Quarter 1 Exam MC
An object is dropped from a height. Once it is moving, which of the following statements is true, at least at one point? a. Its velocity is more than its acceleration b. Its velocity is less than its acceleration c. Its velocity is the same as its acceleration d. Its velocity is never equal to its acceleration
a. its velocity is more than its acceleration
Which of the following is that form of energy associated with an object's location in a conservative force field? a. potential b. thermal c. bio-chemical d.kinetic e. nuclear
a. potential
If we know an object is moving at a constant velocity, we may assume: a.the net force acting on the object is zero b.there are no forces acting on the object c.the object is accelerating
a. the net force acting on the object is zero
As an object is lowered into a deep hole in the surface of the earth, which of the following must be assumed in regard to the objects potential energy? a. increase b. decrease c. remain constant d. increases up to the maximum and then remains constant
b. decrease
A force of a 5 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force: a. remains the same b. increases c. decreases d. doubles every 4s
b. increases
A block is launched up an incline plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is .3. The speed of the block when it reaches the starting position on the trip down: a. is the same as the launching speed b. is less than the launching speed c. is more than the launching speed
b. is less than the launching speed due to friction
A box is to be moved across a level surface. A force of magnitude 200 N may be applied at and angle of 30 degrees below the horizontal to push the box or at an angle of 30 degrees above the horizontal to pull the box, either application sufficient to overcome friction and move the box. Which application will caused the box to have the greater acceleration? a.the one below the horizontal b. the one above the horizontal c. both give equal acceleration
b. the one above the horizontal because pulling upwards will life the box, thus reducing the amount of friction.
If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is: a.at rest b.moving with a constant velocity c. accelerating
c. accelerating
Which of the following is an example of a non-conservative force? a. gravity b. magnetism c. friction
c. friction
Two blocks are released from the top of a building. One falls straight down while the other slides down a smooth ramp. If all friction is ignored, which one is moving faster when it reaches the bottom? a. The block that went straight down b. the block that went down the ramp c. they both will have the same speed d. Insufficient information to work the problem.
c. they both will have the same speed
In the terminology a 500-N black, the 500-N refers to the block's: a.mass b.force c.weight d. both a and c
c. weight
The area under the force vs. displacement curve represents: a. area b. force c. work d. coefficient of static friction e. power
c. work
The unit of work, joule, is dimensionally the same as: a. Newton/second b. Newton/Kilogram c. Newton-second d. Newton-meter e. Newton/meter
d. Newton-meter
A baseball is thrown by the center fielder to home plate where it is caught by the catcher. At what point is the ball's speed at a minimum? a. just after leaving the center fielders hand b. just before arriving at the catchers mitt c. at the top of the trajectory. d. both a and b
d. both a and b
The maximum possible value for the coefficient of static friction is: a. .5 b. 1 c. a value up to but not quite 1 d. greater than 1 e. .94
d. greater than 1
As I slide a box at constant speed up a friction less slope, pulling parallel to the slope, the tension in the rope will be: a.greater than the tension would be if the box were stationary b. greater than the weight of the box c. equal to the weight of the box d. less than the weight of the box. e.less than the tension would be if the box were stationary
d. less than the weigh of the box
When an object is dropped from a tower, what is the effect of the air resistance as it falls? a. does positive work b.increase the objects kinetic energy c. increases the object's potential energy d. increases the total energy of the object e. none of the above choices are valid
e. none of the choices are valid
