Science chapter 11
which of the following has a momentum of zero? -a plane flying through the air -a news paper lying on a table -a leaf falling to the ground -all of the above
-news paper lying on the table
One newton is the force that can give a mass of 1 kg an acceleration of
1 m/s^2
A force of 240.0 N causes an object to accelerate at 3.2 m/s^2. What is the mass of the object?
75 kg
what unbalanced force is needed to give a 976 kg vehicle an acceleration on 2.50 m/s^2
2.44(103 N)
what is the momentum of a .255g apple falling at 16.0 m/s?
4.08 kg (m/s downward)
calculate the velocity of a 90.5 kg man running south with a momentum of 389 kg (m/s)
4.30 m/s south
A 0.25Kg steel ball experiances a net force of 1.15N as it rolls down a ramp. What is the acceleration of the ball?
4.6 m/s^2
What will result in the greatest acceleration? -56 N acting on 1-kg box -56 N acting on a 2-kg box -23 N acting on a 2-kg box -23 N acting on a 5-kg box
56 N acting on 1-kg box
If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have __________ acceleration as (than) Car B. a) the same b) greater c) less d) the opposite
A) the same
Which statement about weight is incorrect..? a) an object weighs more on the moon than it weighs on Earth. b) a change in an object's location can change the object's weight. c) an object's weight is directly proportional to its mass. d) the weight of an object depends on gravity.
a) an object weighs more on the moon than it weighs on Earth.
Which statement illustrates Newton's first law? -stone will not move unless something pushes or pulls it -a ball rolling across the floor eventualy slows down -as a car comes to a stop, the passengers continue to move forward -all of above
all of above
Which is an example of Projectile motion?.. a) a rolling bowling ball b) a dart thrown at a dart board c) a balloon rising in the air d) a high-speed train accelerating
b) a dart thrown at a dart board
Orbital motion is a combination of.. a) mass and friction b) forward motion and free fall c) acceleration and gravity d) weight and vertical velocity
b) forward motion and free fall
Free-fall acceleration near Earth's surface.. a) depends on an object's weight b) is the same for all objects c) depends on to an object's mass d) None of the above
b) is the same for all objects
which object has the greatest inertia? -tennis ball -beachball -bowling bowl -volleyball
bowling
Whenever a force is exerted, another force occurs that is ____ in size, and ___ in direction. a) equal, same b) smaller, same c) equal, opposite d) smaller, opposite
c) equal, opposite
Astronauts "float" when inside an orbiting spaceship because they are.. a) weightless b) in a vacuum c) in free fall d) outside Earth's gravity.
c) in free fall
increasing which of these conditions results in more gravitational force between two objects? a) distance b) acceleration c) mass d) surface area
c) mass
How much does a 59.0 kg woman weigh on Earth? a) 6.02 N b) 59.0 lb c) 145 lb d) 578 N
d) 578 N
Which of the following objects exerts a gravitiational force? a) a bowling ball b) a book c) a feather d) all of the above
d) all of the above
the gravitational force bewtween two object depends on the masses of bjects and ....
distance between objects
what force causes a skater sliding on the ice to to gradually slow down?
friction
When an object is in free fall, the only force acting on it is ... a) gravity b) friction c) inertia d) terminal velocotiy
gravity
how does the total momentum of two objects before a collision compare with the total momentum after a collision?
it is the same
an objects momentum is determined by the object's...
mass and velocity
the force exerted on a racket while hitting a tennis ball is the
reaction force
which statement about action reaction force pairs is incorrect? -they act on the same object -they always occur in pairs -the occur at the same time -they are equal and opposite
they act on the same object
two identical cars are traveling at the same speed. one is going north and the other is going south. they collide head on and stick together. how will the cars react after the collision?
they will both stop
when a moving bowlingball hits a pin, some of the balls momentum is...
transferred to the pin
A seat belt helps you when your car stops suddenly by providing a(n)
unbalanced rearward force
