Physics TEST 4
the same as the speed it had when thrown upward.
A ball is thrown upward and caught when it comes back down. Neglecting air resistance, the speed with which it is caught is
1000N
A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of
40 j
A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy of
same for each
A bullet is dropped from the top of the Empire State Building while another bullet is fired downward from the same location. Neglecting air resistance, acceleration is greatest for the
the same
A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water
cannon has more mass than the ball.
A cannon recoils from firing a cannonball. The speed of the cannon's recoil is small because the
magnitude and direction.
A force is a vector quantity because it has both
100 m downrange
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, where will the bullet be 1 s later?
the fired one
A hunter aims a rifle at an angle of 10° below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
mass
A kilogram is a measure of an object's
400 N
A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is
500N
A person is attracted toward the center of Earth by a 500-N gravitational force. The force of attraction of Earth toward the person is
greater the gravitational force between them.
According to Newton, the greater the masses of interacting objects, the
single interaction
Action and reaction forces comprise the parts of
generator.
Alternating current is normally produced by a
current.
An ampere is a unit of electrical
double
An object is propelled along a straight-line path by a force. If the net force were doubled, its acceleration would
the same
Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is
2 W because w/t = power
Exert 100J in 50s, and your power output is
240 W
The electric power of a lamp that carries 2 A at 120 V is
parallel circuit
The headlights, radio, and defroster fan in an automobile are connected in
poles
The intensity of cosmic rays bombarding Earth's surface is largest at the
36 W
The power dissipated in a 4 ohm resistor carrying 3 A is
twice as far as the slower arrow.
Two identical arrows, one with twice the kinetic energy of the other, are fired into a hay bale. The faster arrow will penetrate
momentum.
Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has greater
work
What do we call the quantity (Force) x (Distance)?
center seeking
What does "centripetal" mean?
Every force that act on an object equals zero. There are no vector sum of all the forces. The vector sum of all the forces that act on an object equals zero. The forces cancel!
What does ⅀F = 0 mean?
2400 N
What horizontal applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?
125-115 = 10N
What net force does a sliding crate experience when you exert a force of 125N and the friction between the crate and floor is 115N?
energy
What quantity does Work change?
direction magnitude
What quantity(ies) is(are) necessary to determine a vector quantity? Could be more than one answer!!
5 ohms
When a 10-V battery is connected to a resistor, 2 A of current flow in the resistor. What is the resistor's value?
more than double
When an increase in speed doubles the momentum of a moving body, its kinetic energy.
more than doubles
When an increasing in speed doubles the momentum of moving body, its kinetic energy
is zero
Whenever the net force on an object is zero, its acceleration
weight
Which depends on gravity - weight or mass?
up
Which direction does a table push a book resting on it?
follow a straight-line path.
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
3000 N. Newtons 3rd law of motion
A Karate chop delivers a force of 3000 N to a board that breaks. The force that the board exerts on the hand during this event is
40 j
A TV set is pushed a distance of 2 m with a force of 20 N that is in the same direction as the set moves. How much work is done on the set?
12 kg
A ball is moving at 4 m/s and has a momentum of 48 kg ∙ m/s. What is the ball's mass?
10s
A ball is thrown 125 m upward and then falls the same distance back to the Earth. Neglecting air resistance, its total time in the air is about
as soon as it leaves the barrel.
A bullet fired from a rifle begins to fall
0.5 g
A falling skydiver of mass 100 kg experiences 500-N air resistance. The acceleration of the skydiver is Question 2 options:
less resistance
Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have
1/6 m/s
Consider massive gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with glider B, which has a mass of 5 kg and is at rest. If they stick upon collision, their speed after collision will be
both inside and outside Earth and throughout the entire universe.
Earth's gravitational field extends
time, speed and volume
Find the examples of scalar quantity. Check all that apply!
add up to equal your weight.
Hang from a pair of gym rings and the upward support forces of the rings will always
inertia
What is the name of property of objects to maintain their states of motion?
less than the resistance of either lamp.
When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is
10 m/s
If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about
greater than the second before.
If a freely falling object were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be
increases
If an object's mass is decreasing while a constant force is applied to the object, the acceleration
1 W
If you exert 1 N for a distance of 1 m in 1 s, you will deliver a power of
??at all ????
If you push for an hour against a stationary wall, no work is done
Watts
In what unit POWER is measured?
100 N
Magnet A has twice the magnetic field strength of magnet B, and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
spin on their axes and move around the nucleus.
Magnetism is due to the motion of electrons as they
10 m/s
Neglecting air resistance, when you toss a rock upward, by about how much does its upward speed decrease each second?
3000 N
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 weight of about
an electric field
Rapid changes of a magnetic field induces
0
Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be
They will both hit with the same speed.
Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greatest speed will be the one initially thrown
yes just enough so it =0
Suppose you push on a heavy crate, but not hard enough to make it slide. Does a friction force act on the crate?
a magnetic field. an electric field.
Surrounding every moving electron is
20 km/h
The average speed of a horse that gallops a distance of 10 km in a time of 30 min is
Momentum is transferred to the ground when an apple falls on it. The momentum absorbed by the ground is
greater than that of the apple only if the apple bounces.
inertia
ne object has twice as much mass as another object, and also has twice as much
moving a magnet near the wire. moving the wire near a magnet changing the current in a nearby wire.
voltage can be induced in a wire by
10 N neglect air resistance
A 1-kg rock that weighs 10 N 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 is
0 N
A 10-N falling object encounters 10 N of air resistance. The net force on the object is
2x as much
A 1000-kg car and a 2000-kg car are hoisted the same distance in a gas station. Raising the more massive car requires
2m
A 2-kg mass has 40 J of potential energy with respect to the ground. Approximately how far is it located above the ground?
? Kientic ?
Compared to a recoiling rifle, the bullet fired has a greater
equally huge
Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
force of the ball against the bat.
A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the
its weight
A rock is thrown vertically into the air. At the very top of its trajectory, the net force on it is
1500 kg
A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s2. What is the mass of the car?
0 J
A woman lifts a 10 kg box from the floor. She then moves with constant speed to the other side of the room, where she puts the box down. How much work does she do on the box while walking across the floor at constant speed?
moving
An object that has kinetic energy must be
decrease
An open freight car rolls friction-free along a horizontal track in a pouring rain that falls vertically. As water accumulates in the car, its speed
both the same
Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greatest force on the rope is exerted by
susie
Arnold Strongman and Suzie Small have a tug-of-war on a polished floor. Arnold wears socks and Suzie wears gym shoes. The likely winner is
increases
The ball are rolling on Inclined Plane. How does the distance traveled by the ball in the second half second compare with the distance traveled by the ball in the first half second?
Newtons 3 law
The conservation of momentum is most closely related to
12 v
The current through a 10 ohm resistor connected to a 120-V power supply is
in the same direction of gravitational attraction.
The direction of a gravitational field is
road
The force exerted on the tires of a car to directly accelerate it along a road is exerted by the
1o N
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
moving electric charge.
The source of all magnetism is
ohms
The units used to measure electrical resistance are called
increases
Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them
??? heavy object????
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
an automobile battery
Which has the greater mass?
north pole
Which pole of a compass needle points to a south pole of magnet?
both require sam amount of work
Which requires more work: lifting a 50-kg sack vertically 2 m or lifting a 25-kg sack vertically 4 m?
Equal to 5N, because the force of friction should exactly balance out the force that you apply on a block, so that there is no net force acting on the block.
You are dragging a block on a surface with friction at a steady speed of 2 m/s and exert a force of 5N to do so. What is the force of friction? Why?
2x as great
You lift a barbell a certain distance from the floor. If you lift it twice as high, its potential energy is
