physical science chapter 2 quizzes
A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is
1 m/s²
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
10 times as much as the force on the 1-kg book.
A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick requires the force to be
10 times as much.
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 much force on the heavier block.
A commercial jet has a mass of 5000 kg. During takeoff the thrust of its engine is 10,000 N, producing an acceleration of
2 m/s²
Jake pulls on a 25-kg cart with a constant force of 50 N. What is the wagon's acceleration?
2.0 m/s²
Arnold Strongman wearing socks and Suzie Small in gym shoes have a tug-of-war on a polished floor. The likely winner is
Suzie.
When you step off a bus moving at 2 m/s, your horizontal speed when you meet the ground is
about 2 m/s.
If the mass of an object does not change, a constant net force on the object produces constant
acceleration.
Newton's second law focuses on
acceleration.
Earth moves about 30 km/s relative to the Sun. When jump upward in front of a wall, the wall doesn't slam into you at 30 km/s because the wall
and you move at the same horizontal speed, before, during, and after your jump.
A heavy object and a light object in a vacuum are dropped at the same time from rest. The heavy object reaches the ground
at the same time as the light object.
A player hits a ball with a bat. If one part of the interaction is the bat against the ball, the other part is the
ball against the bat.
Earth pulls on the Moon. Similarly the Moon pulls on Earth, evidence that
both of the above
To steadily (constantly) increase the velocity of something requires a
constant net force.
If an object falls with constant acceleration, the velocity of the object must
continually change by the same amount each second.
Action and reaction pairs of forces always act on
different bodies.
When you toss a coin straight up, it moves upward, turns around, and drops. During all this time the acceleration of the coin is
downward and constant.
A moving van with a stone lightly glued to the midpoint of its ceiling smoothly moves at constant velocity. When the glue gives way, the stone falls and hits the floor
exactly below the midpoint of the ceiling.
A player catches a ball. Consider the action force to be the ball against the player's glove. The reaction is the
force of the glove on the ball.
The force of a boxer's punch is greater when it hits a
heavy punching bag.
If an object's mass decreases while a constant force acts on it, the acceleration
increases
If you jump straight up while inside a fast-moving train that gains speed, you land
slightly behind your original position.
If gravity between the Sun and Earth suddenly vanished, Earth would move in
straight-line path.
A quick jerk on a sheet of paper beneath a box of cereal doesn't topple the box, which best illustrates that
the box has inertia.
You cannot exert a force on a wall
unless the wall simultaneously exerts the same amount of force on you.
An object in motion tends to remain in motion
without the need of a force.
The force required to maintain an object at a constant velocity in free space is equal to
zero
A martial arts person breaks a board with a blow of 3000 N. The force that acts on the hand is
•3000 N.
A hockey puck slides across a frozen pond. If ice friction and air resistance are neglected, the force needed to keep the puck sliding at constant velocity is
0 N
When an apple that weighs 1N is held at rest above your head, the net force on the apple is
0 N.
The emphasis of the orange-and-apple sequence in your text is
to define systems.
A 1000-kg car accelerates at 2 m/s?. What is the net force exerted on the car?
2000 N
When a 500-N parachutist opens his chute and experiences 800 N of air resistance, the net force on him is
300 N upward.
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.
When a rocket ship gaining speed in remote, gravity-free outer space runs out of fuel, it
no longer gains speed.
The attraction of Earth on a skydiver pulls the diver downward. The reaction to this force is
none of the above
When you toss a ball upward, after the ball leaves your hand
none of the above
A stone is thrown vertically upward. At the top of its vertical path the force acting on it is
only the force due to gravity.
Inertia is defined as a
property of matter.
The force exerted on the tires of a car to directly accelerate the car along a road is exerted by the
road
A car traveling at 100 km/h strikes an unfortunate bug that splatters on the windshield. The force of impact is greater on the
same for both
AMack truck and a Mini Cooper traveling at the same speed collide head-on. The collision force is greatest on the
same on both
A force of 1 N accelerates a 1-kg mass at 1 m/s2. The acceleration of a 2-kg mass acted upon by a force of 2 N is
the same.
To say there is no such thing as only one force means
there must also be an oppositely directed force.
