Gravity
Torque and CoM
Spring Force & Others
Electrostatic Force Law
Grab Bag
100
This is the correct unit for gravitational field strength (g).
What are N/kg?
100
To attempt to open a door whose handle is 0.75 m from its hinges, I apply a force of 4 N. This is the magnitude of the torque I have applied to the door (with correct units).
What is 3 Nm?
100
For a sign that is suspended by two cables and hangs in equilibrium, these are all the forces that are exerted upon the sign.
A. Air Resistance
B. Force of Friction
C. Force due to Gravity
D. Magnetic Force
E. Normal Force
F. Spring Force
G. Tension
H. Applied Force
What are C. Gravity and G. Tension?
100
Of the charges shown, these are the ones that will have an electrostatic force pushing or pulling them to the right.
What are A, C, and F?
100
This is the tendency of moving objects to remain in motion, and the tendency of stationary objects to remain at rest.
What is inertia?
200
The value of g on earth is 9.8 N/kg. 'g' stands for this.
What is gravitational field strength?
200
Five identical keys are suspended from a balance, which is held horizontally as shown. The two keys on the left are attached to the balance 15 cm from the pivot and the three keys on the right are attached 18 cm from the pivot. This is the direction the balance beam will rotate when the person lets go.
What is clockwise?
200
The diagram below represents forces acting on an object. The size of the arrow represents the magnitude of the force. This one is the most consistent for a skydiver falling through the air before they've opened their parachute.
What is A?
200
Quadrupling the distance between two charged objects will cause the electrical force between them to be this in relation to the initial force.
What is one-sixteenth?
200
True or False
The weight of an object on the moon will be the same as its weight on earth.What is False?
300
The mass of a planet is 2.87 x 1023 kg. The radius of the planet is 2.2 x 106 m. This is the gravitational field strength (g) of that planet.
What is 3.4 N/kg?
300
This is the mass needed to balance the bar below.
What is 4.34 kg?
300
In the image shown, this situation has the least tension in the cable labeled R.
What is B?
300
In the image shown, this is the magnitude and direction of the electrostatic force acting on the charge labeled q (assuming q is positive), in terms of K and q.
What is
300
If an object is positively-charged, then one can be sure that it contains more _____ than _____.
(2 answers, order matters)
What are protons and electrons?
400
Suppose that an object weighs 80 Newtons on the surface of the Earth (a distance of R from its center). If the same object is located a distance of R above the Earth’s surface (a distance of 2R from its center), then the force of gravity upon it would be this many Newtons.
What is 20.0?
400
This is location a string should be attached to the bar below so that it will be balanced when hung from that string.
What is 2 blocks from the left, or 3 blocks from the right?
400
A mass of 0.551 kg is attached to a spring with a spring constant of 18.6 N/m while on Earth. The gravitational field strength on earth (g) is equal to 9.8 N/kg. This is the amount the spring will stretch when the mass is hung from the spring and equilibrium is established, with correct units and 2 sig figs.
What is 0.29 m or 29 cm?
400
Two metal spheres each of mass 6.51 kg are charged. Sphere 1 has a charge of -10.5μC. Sphere 2 has a charge of -10.1μC. The spheres are 7.8 m apart. This is the magnitude and direction of the electrostatic force acting on Sphere 2, with correct units and 3 sig figs.
What is 5.94 N to the right?
400
Two metal spheres each of mass 6.51 kg are charged. One of the spheres has a charge of -10.5μC. The other sphere has a charge of -10.1μC. The spheres are 7.8 m apart. This is the magnitude of the gravitational force between them, with correct units and 3 sig figs.
What is 4.65 x 10-11 N?