Chapter 2 Quizzes
A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is actually
3000 N
A piece of rope is pulled by two people in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope?
400 N
In each second of fall, the distance a freely falling object will fall is
increasing.
A feather and a coin will have equal accelerations when falling in a vacuum because
the ratio of each object's weight to its mass is the same
The mass of a pet turtle that weighs 10 N is about
1 kg
The weight of 0.6 kg of salami is about
6.0 N
An object travels 8 m in the first second of travel, 8 m again during the second second of travel, and 8 m again during the third second. Its acceleration in meters per second per second is
0
A 10-N falling object encounters 10 N of air resistance. The net force on the object is
0 N
A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is
0 N
A 10-N falling object encounters 10 N of air resistance. The net force on the object is
0 N.
A skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about
0.5g
When a rock thrown straight upwards gets to the exact top of its path, its velocity is
zero and its acceleration is about 10 m/s/s
Two people, one twice as massive as the other, attempt a tug-of-war with 12 m of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of
4 m
A 10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with
10 times as much force on the heavier block
Careful: On the surface of Jupiter, where the acceleration due to gravity is about three times that of Earth, a 100-kg rock would have a mass of about
100 kg
Ten seconds after starting from rest, a freely falling object will have a speed of about
100 m/s
A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of
1000 N
An object released from rest on another planet requires 1 s to fall a distance of 6 m. What is the acceleration in meters per second per second due to gravity on this planet?
12
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that
the milk carton has inertia
The attraction of a person's body toward the earth is called weight. The reaction to this force is
the person's body pulling on the earth.
A force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s/s. The acceleration of a mass of 2 kg acted upon by a force of 2 N is
the same
The brakes are slammed on a speeding truck and it skids to a stop. If the truck were heavily loaded so it had twice the total mass, the skidding distance would be
the same
Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom
the same time as the light block
An apple weighs 1 N. The magnitude of net force on the apple when it is in free-fall is
1 N
A rock is thrown vertically into the air. At the top of its path, its acceleration in meters per second per second is about
10
A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the ball when it is half way to the top of its path is about
10 N
Disregarding air drag, how fast must you toss a ball straight upward in order to remain in the air for a total time of 2 s?
10 m/s
A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 s. The speed of the car just before the brakes were applied was
30 m/s.
A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle to undergo the greatest change in velocity will be the (Volkswagen, both the same, Mack truck.)
Volkswagen
Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no wall, no tricks. You
agree that it can't be done.
A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground
at the same time as the lighter object
Earth pulls on the Moon. Similarly the Moon pulls on Earth, evidence that
both of these.
If an object falls with constant acceleration, the velocity of the object must
continually change by the same amount each second.
A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
decreases
When an object falls through the air, its velocity increases and its acceleration
decreases
A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
directed downward
An elephant and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is greater on the
elephant.
A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the
force the glove exerts on the ball.
Consider drops of water that leak from a dripping faucet. As the drops fall, they
get farther apart
An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
halves
An object following a straight-line path at constant speed
has zero acceleration
Two objects of the same size, but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
heavier object.
A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is greater on the
is the same for both
A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is
its weight
A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first?
light woman
Strange as it may seem, it is just as hard to accelerate a car on the Moon as it is to accelerate the same car on Earth. This is because the
mass of the car is independent of gravity.
An object maintains its state of motion because it has
mass.
A falling object that has reached its terminal speed continues to gain (speed, acceleration, neither, both)
neither
A horse exerts 500 N of force on a heavy wagon. The wagon pulls back on the horse with an equal force. The wagon still accelerates because
nevertheless there is still an unbalanced force on the wagon
While a car travels around a circular track at a constant speed, its (acceleration is zero, both of these, velocity is zero, none of these)
none of these
The force exerted on the tires of a car to directly accelerate it along a road is exerted by the
road
Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom
the same time as the light block.
