Conceptual 1
Which cart has the greatest inertia?
1. a 1-kg cart traveling at 4 m/s
2. a 2-kg cart traveling at 3 m/s
3. a 3-kg cart traveling at 2 m/s
4. a 4-kg cart traveling at 1 m/s
4-kg cart
Which unit is equivalent to a newton per kilogram?
1. m/s^2
2. W/m
3. J∙s
4. kg∙m/s
A 3.0-kilogram mass weighs 15 newtons at a given point in the Earth's gravitational field. What is the magnitude of the acceleration due to gravity at this point?
5 m/s2
Weight of a 1 kg object.
9.81 N
A 160-kilogram space vehicle is traveling along a straight line at a constant speed of 800 meters per second. The magnitude of the net force on the space vehicle is
0 N
A student is standing in an elevator that is accelerating downward. The force that the student exerts on the floor of the elevator must be
1. less than the weight of the student when at rest
2. greater than the weight of the student when at rest
3. less than the force of the floor on the student
4. greater than the force of the floor on the student
The same net force is applied to object A and object B. The mass of B is three times greater than the mass of A. Compared to the acceleration of A, the acceleration of B is
the same
one-third as great
three times as great
one-ninth as great
One-Third as great
A 0.50-kilogram frog is at rest on the bank surrounding a pond of water. As the frog leaps from the bank, the magnitude of the acceleration of the frog is 3.0 meters per second2 . Calculate the magnitude of the net force exerted on the frog as it leaps. [Show all work, including the equation and substitution with units.]
1.5 N
Weight of a 70 kg object.
686.7 N
This is the only continent without deserts.
Europe
A 3-newton force and a 4-newton force are acting concurrently on a point. Which force could not produce equilibrium with these two forces?
1. 1 N
2. 7 N
3. 9 N
4. 4 N
9 N
A 0.50-kilogram cart is rolling at a speed of 0.40 meter per second. If the speed of the cart is doubled, the inertia of the cart is
Unchanged
A soccer player accelerates a 0.50-kilogram soccer ball by kicking it with a net force of 5 newtons.
Calculate the magnitude of the acceleration of the ball. [Show all work, including the equation and substitution with units.]
10 m/s2
A 4.0-kilogram object is accelerated at 3.0 meters per second2 north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward the north at
6 m/s2
This animal is the only marsupial in North America.
Opossums (Ms. Kerner's Favorite Animal!)
Two forces act concurrently on an object. Their resultant force has the largest magnitude when the angle between the forces is
1. 0°
2. 30°
3. 90°
4. 180°
0°
An elevator containing a man weighing 800 N is rising at constant speed. The force exerted by the man on the floor of the elevator is
800 N
Draw a vector diagram for the following:
the horizontal component, Fx, and the vertical component, Fy, of a 24-newton force acting at 35° above the horizontal.
What are the magnitudes of the horizontal and vertical components?
Fx=14 N
Fy= 20 N
A 25-newton horizontal force northward and a 35-newton horizontal force southward act concurrently on a 15-kilogram object on a frictionless surface. What is the magnitude of the object’s acceleration?
0.67 m/s2
This is the year the Titanic sunk.
1912
The weight of a chicken egg is most nearly equal
to:
1. 10-3 N
2. 10-1 N
3. 100 N
4. 102 N
2. 10-1
A rock is thrown straight up into the air. At the highest point of the rock’s path, the magnitude of the net force acting on the rock is...
the same as the magnitude of the rock’s
weight
The instant before a batter hits a 0.14-kilogram baseball, the velocity of the ball is 45 meters per second west. The instant after the batter hits the ball, the ball’s velocity is 35 meters per second east. The bat and ball are in contact for 1.0 × 10^-2 second
Determine the magnitude and direction of the average acceleration of the baseball while it is in contact with the bat.
3,500 m/s2 east
The instant before a batter hits a 0.14-kilogram baseball, the velocity of the ball is 45 meters per second west. The instant after the batter hits the ball, the ball’s velocity is 35 meters per second east. The bat and ball are in contact for 1.0 × 10^-2 second
Calculate the magnitude of the average force the bat exerts on the ball while they are in contact. [Show all work, including the equation and substitution with units.]
490 N
Ms. Kerner's Cat's Middle Name
Wiley