C12
One newton is the force that can give a mass of 1kg an acceleration of ____.
1 m/s2
Express the following as an equation:One newton is the force that can give an object with a mass of 1 kg an acceleration of 1 m/s2?
1N=1kg ' 1m/s2
The law that states that every object maintains constant velocity unless acted on by an unbalanced force is Newtons ____ law of motion.
1st
The law that states that the unbalanced force acting on an object equals the object mass times its acceleration is Newtons ____ law of motion.
2nd
Earth pulls the moon and holds moon in its orbit. The moon pulls on earth with an equal and opposite force. This is an example of Newtons ____ law of motion
3rd
The law that states that for every action force there is an equal and opposite reaction force is Newtons ___ law of motion.
3rd
A 10.0 kg dog chasing a rabbit north at 6.0 m/s has a momentum of ________.
60.0 kg x m/s north
How much does a 62.0 kg woman weight on Earth?
607.6N
Free-fall acceleration near Earths surface is ____ m/s2.
9.8
Which has a greater momentum,a small pick-up truck traveling at 67km/h or a full sized bus traveling at the same speed?
A full sized bus
Rearrange the equation for Newtons second law of motion to define acceleration in terms of force and mass.
Acceleration= force/mass
What happens immediately after a skydiver opens a parachute?
Air resistance greatly increases
Which of the following is true?
All of the above; Weight and mass are proportional but not equal. Weight is the gravitational force an object experiences due to its mass. The weight of an object on earth is greater than the weight of the same object on the moon, but the objects mass stays the same.
If the net force on an object is zero, then the object has _______ forces.
Balanced
If you are given the mass of an object in pounds, the time in seconds, and the distance in feet, what must you do before you can calculate the momentum in SI units?
Convert the mass to kilograms, convert the distance to meters.
Whenever a force is exerted, another force occurs that is ______ in size, and ______ in direction.
Equal, opposite
What unbalanced force is needed to give a 917 kg vehicle an acceleration of 4.50 m/s2?
F=4126.5N
Orbital motion is a combination of ________ and ________.
Forward motion, and free fall.
Astronauts "float" when inside an orbiting spaceship because they are in ________.
Free fall
The weight of an object can be calculated by multiplying mass by ________
Free fall acceleration
What force causes a skater sliding on the ice to gradually slow down?
Friction
When an object is in free fall, the only force acting on it is ________.
Gravity
A change in an objects ______ can change the objects weight. An objects ______ is directly proportional to its mass. The weight of an object depends on ______.
Gravity,weight, gravity
The tendency of an object at rest to remain at rest is ______.
Inertia
How does the total momentum of two objects before a collision compare with the total momentum after the collision?
It stays the same before and after the collision.
If you divide momentum by velocity, the result is the value of the objects ______.
Mass
Increasing ______ results in more gravitational force between two objects .
Mass
What determines how much inertia an object will have?
Mass
An object momentum is determined by the objects ________ and _______.
Mass, velocity
The SI unit of force, named after the scientist who described the relationship between motion and force is called ________.
Newton
What is the momentum of a 325 g apple falling at 14.0 m/s?
P= 4.55 kg ' m/s downward
Weight is best described as _________.
Pull of gravity on matter.
The force exerted on the racket by a hit tennis ball is the ______ force.
Reaction
Whenever an object is standing still, _____________, is always zero.
Speed, velocity, and momentum
When gravitational forces and air resistance equalize on an object that is falling toward the Earth, and the object stops accelerating, what is the velocity of an object called?
Terminal velocity
On the moon, objects weigh about one-sixth what they do on earth. What does that tell you about g, the free-fall acceleration, on the moon as compared to g on Earth?
That its less on the moon.
The gravitational force between two objects depends on masses of objects and ___________.
The distance between them
What is the unbalanced force that slows down a ball rolling across the floor?
The force of friction
If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after collision?
The law of conservation of momentum
Name 2 objects that wil exert the greatest gravitational force you can think of.
The moon, and the sun
If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have _________ acceleration as Car B.
The same
A small sports car traveling south collides with a heavy truck traveling north. Both vehicles are going at the same speed. Which will be moved of course by the collision and in which direction?
The small sports car will be moved off course to the north.
Two identical cars traveling at equal speeds in opposite directions collide head-on. They stick together after the collision. How fast are the cars moving immediately after the collision?
They come to a sudden stop.
In the absence of air resistance, how the acceleration of a 2.2 kg book and the acceleration of a 22 kg rock differ if the objects were dropped from the same height?
They wouldn't differ they accelerate at the same speed falling down.
Name several examples of projectile motion.
Throwing a baseball. Throwing a football.
When a moving bowling ball hits a pin, some of the balls momentum is ________ to the pin.
Transfered
A tug-of-war that results in one team pulling the other across the line is an example of ________ forces.
Unbalanced
A seat belt helps you when your car stops suddenly by providing a _______.
Unbalanced backward force
What is the equation for weight?
Weight= mass ' free-fall acceleration
What is the SI unit for acceleration?
m/s2
