Conceptual Physics Test 3
A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?
1500kg
An apple at rest weighs 1N the net force on the apple when it is in free fall is
1N
A kilogram is a measure of an object's
Mass
Two factors that greatly affect air resistance on falling objects are frontal area and
Mass
If a non-rotating object has no acceleration, then we can say for certain that it is
Mechanical Equilibrium
If an apple experiences a constant net force, it will have a constant
More than one of the above
An object's weight is properly expressed in units of
kilograms
The mass of a pet turtle that weighs 10N is about
1 kg
A bag of groceries that has a mass of 10 kilograms weighs about
100N
A 1kg mass at the Earth's surface weighs
10N
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10N
A sack of potatoes weighing 200N falls from an airplane as the velocity of fall increases air resistance also increases when air resistance equals 200N the sack's acceleration becomes
0 m/s
A 10-N block and a 1-N block lie on a horizontal frictionless table . To impart equal horizontal accelerations we would have to push the heavier block with
10 times as much force
A push on a 1-kg brick accelerates it. Neglecting friction, equally accelerating a 10-kg brick requires
10 times as much force
A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What net force is exerted on the car ?
2000N
A 10N falling object encounters 4N of air resistance. The net force on the object is
6N
A feather and a coin will have equal accelerations when falling in a vacuum because
the ratio of both the feather's and coin's weight to mass is the same
A 10N falling object encounters 10N of air resistance. The net force on the object is
0N
An apple weighs 1N when the apple is held at rest above your head the net force on the apple is
0N
A 1kg rock that weighs 10N is thrown straight upward at 20 m/s neglecting air resistance the net force that acts on it when it is half way to the top of its path
10N
A rock is thrown vertically into the air. At the top of its path, its acceleration is
10m/s
The mass of a lamb that weighs 110N is about
11 kg
A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration of the car?
220 m/s
Nellie pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration?
3.0m/s
A 500N parachutist opens his chute and experiences an air resistance force of 800N the net force is
300N upward
Suzie Skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on Suzie is then
500N
A 10 kg block with an initial velocity of 10m/s slides 10 meters across a horizontal surface and comes to rest it takes the block 2 seconds to rest it rakes the block 2 seconds to stop . The stopping force acting on the block is about
5N
A mobile phone is pulled northward by a force of 10 N and at the same time pulled southward by another force of 15 N. The resultant force on the phone is
5N
If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity the object
Accelerates in the direction if the opposite applied force
A constant net force on a railroad car produces constant
Acceleration
If you double the net force on an object you'll double it's
Acceleration
Which has zero acceleration? An object
All of the above
At equilibrium on a bathroom weighting scale, the downward pull of gravity on you is balanced by
An upward support force
Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
Decreases
The newton is a unit of
Force
If an object's mass is decreasing while a constant force is applied to the object, the acceleration
Halves
If the mass of a cart is quickly loaded to have twice the mass while a propelling force remains constant, the cart's acceleration
Increases
If the net force on a cart is tripled the cart's acceleration
Is three times as much
A car by itself is capable of a certain maximum acceleration When it tows a a car of the same mass its maximum acceleration is
One half
A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass?
The one on the Moon
A force of 1 N accelerates 1-kg box at the rate of 1 m/s2. The acceleration of a 2-kg box by a net force of 2 N is
The same
A 10kg brick and a 1kg apple are dropped in a vacuum the force of gravity on the brick is
The same as the force on the apple
The force required to maintain an object at a constant velocity in free space is equal to
Zero
When a falling object has reached its terminal velocity, its acceleration is
Zero
Whenever the net force on an object is zero, its acceleration
Zero
A boulder following a straight-line path at constant velocity has
Zero acceleration
Recall Galileo's Leaning Tower experiment with negligible air resistance a heavy and a light object fall
all of the above
An object with twice as much mass as another object has twice as much
inertia
A rock is thrown vertically into the air . At the top of its path the net force on its
mg
Compared to the mass of an apple on Earth the mass of the apple on the Moon is
the same
