PHSC 101 Chapter 2 Newton's Law
Ten seconds after starting from rest, a freely falling object will have a speed of about
100 m/s
When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is
1000 N
Scotty Skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about
0.5 g.
A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second per second?
3.0
A 10-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
6 N
A 10-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
6 N. CORRECT
If an object falls with constant acceleration, the velocity of the object must
continually change by the same amount each second.
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 the ground first?
The heavy man
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 pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. The ball to reach the ground first is the
lead-filled ball.
An object maintains its state of motion because it has
mass
A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time?
300 m
One-half second after starting from rest, a freely falling object will have a speed of about
5m/s
A Mack truck and a Volkswagen traveling at the same speed collide head-on. The impact force is greatest on the
is the same for both
A force is a vector quantity because it has both
magnitude and direction.
A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the
force that the ball exerts on the bat.
A large and a small person wish to parachute at equal terminal velocities. The larger person should
get a larger parachute.
A large and a small person wish to parachute at equal terminal velocities. The larger person will have to
get a larger parachute.
A skydiver's terminal velocity will be greatest if she falls
head first
A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of
1000 n
A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is
0
The force required to maintain an object at a constant velocity in free space is equal to
ZERO
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-kilogram 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 ( 1 m/s squared)
When a falling object has reached its terminal velocity, its acceleration is
0( ZERO)
The maximum acceleration of a car while towing a second car twice its mass, compared to no towing, is
1/3
A skydiver steps from a helicopter and falls for 5 s before reaching her terminal velocity. During this 5-s interval, her acceleration
decreases
While you stand on the floor you are pulled downward by gravity, and supported upward by the floor. Gravity pulling down and the support force pushing up
do not make an action-reaction pair of forces.
An object is propelled along a straight-line path by a force. If the net force were doubled, its acceleration would
double.
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to
follow a straight-line path.
The distance a freely falling bowling ball falls each second
increases.
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 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 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.
A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with
10 times as much force.
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 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?
The light woman
It takes 6 s for a stone to fall to the bottom of a mine shaft. How deep is the shaft?
about 180 m
A freely-falling watermelon falls with constant
acceleration
