Post Test: Newton's Laws
A bookshelf is at rest in a room. A force of 35.0 newtons is applied to a bookshelf. If the floor imparts a frictional force of 2.90 newtons, what is the net force acting on the bookshelf?
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In the above diagram, the block is at static equilibrium on the ground. What is the value of the force exerted by the ground on the block if the force due to gravity is 12 newtons?
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What would be Kelly's weight be in newtons if her mass is 70 kilograms?
A. 70 x g
An object is acted upon by a force of 22 newtons to the right and a force of 13 newtons to the left. What is the magnitude and direction of the net force?
A. 9 newtons to the right
An object in static equilibrium has a coefficient of static friction as 0.110. If the normal force acting on the object is 95.0 newtons, what is the mass of the object?
A. 9.70 kilograms
Which statement is true for objects in dynamic equilibrium?
A. objects have zero acceleration
If a ball is given an acceleration of 3.0 meters/second2 while being pushed with a force of 0.75 newtons, what is the mass of the ball?
B. 0.25 kilograms
Eli and Andy want to find out which of the two is stronger. Eli pushes a table with a force of 120 newtons while Andy pushes the table from the opposite side with a force of 125 newtons. Ignoring the masses of Eli and Andy, what is the resultant acceleration of the table if its mass is 10.0 kilograms?
B. 0.50 meters/second^2
Ted wants to hang a wall clock on the wall by using a string. If the mass of the wall clock is 0.250 kilograms, what should be the tension of the string so that it can sustain the weight of the wall clock?
B. 2.45 newtons
In the diagram, a force of 20 newtons is applied to a block. The block is in dynamic equilibrium. What is the magnitude and direction of the frictional force?
B. 20 newtons opposite to the direction of the applied force
A brick is lying on a table in a state of static equilibrium. If the mass of the brick is 7.52 kilograms, what is the normal force exerted by the table on the brick?
B. 73.7 newtons
The weight of an object on Earth is 350 newtons. On Mars, the same object would weigh 134 newtons. What is the acceleration due to gravity on the surface of Mars, given that it is 9.8 meters/second2 on Earth?
C. 3.75 meters/second^2
Mary pushes a crate by applying force of 18 newtons. Unable to push it alone, she gets help from her friend, Anne. Together they apply a force of 43 newtons, and the crate just starts moving. If the coefficient of static friction is 0.11, what is the value of the normal force?
C. 3.9 x 10^2 newtons
A car has a mass of 1.00 × 103 kilograms, and it has an acceleration of 4.5 meters/second2. What is the net force on the car?
C. 4.5 x 10^3 newtons
A 70 kilogram mountaineer is standing on the summit of Mt. Everest. The distance between the mountaineer and the center of Earth is 6.39 × 106 meters. What is the magnitude of the force of gravity acting on the mountaineer? (The value of G is 6.673 × 10-11 newton meter2/kilogram2. The mass of Earth is 5.98 × 1024 kilograms.)
C. 684 newtons
Which statement is true according to Newton's second law of motion?
C. an object accelerates in the same direction as that of the force applied
An object at rest requires a force of 15 newtons to set it into motion. This force is greater than which force?
C. friction
Object A attracts object B with a gravitational force of 5 newtons from a given distance. If the distance between the two objects is reduced in half, what will be the changed force of attraction between them?
D. 20 newtons
What is the weight of an object (mass = 60 kilograms) on Mars, where the acceleration due to gravity is 3.75 meters/second2?
D. 225 newtons
What kind of motion indicates a system where the net force equals zero?
E. stationary objects as well as objects moving with a constant velocity
