Newton's 1st
Momentum
Newton's 2nd
Centripetal Force
Labs
100
What is the definition of Newton's first law?
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
100
As a skateboarder increases her speed (or velocity) from 2 m/s to 4 m/s, she also increases her
Momentum
100
An object has a mass of 2 kg and accelerates at an average of 3 m/s/s. What is the amount of net force acting on the object?
6 N
100
If Lady Gaga were riding a dolphin on a merry-go-round, what direction would the centripetal force be?
Inward, center seeking, towards the center of the merry-go-round.
100
How does the mass of the attracting body affect the revolutions per minute?
As the mass of the attracting body goes up, the number of revolutions goes up.
200
How could you slide a book on a highway and never have it stop?
By eliminating the friciton, the book would never stop sliding ( unless a different, unbalanced force acts upon it)
200
What unit is Momentum measured in?
Newton seconds or kilogram-meters per second (kg m/s^2)
200
Harry has a mass of 60 kg. He sits on a gigantic ice cube. He is pushed with a force of 30 N. How quickly will he accelerate?
.5m/s/s
200
Why does Mars have a longer revolution period around the sun then Earth?
Since Mars is farther away from the sun (increased radius) the centripetal force is less. Because the centripetal force is less, Mars takes longer to complete one revolution around the Sun
200
How does the acceleration of two different masses affect the displacement of a barrier (fake brick wall)
The greater the acceleration (book height) the greater the displacement of the barrier
300
What determines the inertia of an object?
Mass
300
What is the momentum of a 40-kg turtle moving southward at 2 m/s
80 N, SOUTH
300
Sir Isaac states that no force is required to maintain the motion of a moving object. Explain why you must continue to pedal your bicycle even on a level surface to keep it moving.
An object in motion will remain in motion as long as there is no net force acting on the object. While you pedal your bicycle, there is the net force of friction acting upon the bicycle. To keep the bicycle moving, you must apply a force to balance the force of friction so that the net force on the moving bicycle will be zero while the bicycle is in motion.
300
How does the radius of a circle affect the amount of centripetal force?
As the radius increases, the amount of centripetal force decreases.
300
How did the mass of a bearing affect the displacement of a barrier
The bearing with more mass caused the the barrier to be displaced more because it had greater momentum and inertia
400
How can a magician, or science teacher, pull a table cloth off a table without moving any of the dishes on it?
The table cloth is the only object that is having an unbalanced force applied. Their is no force being applied to the dishes and according to Newton's first law, an object at rest will remain in rest until an unbalanced force acts upon it.
400
A 8kg bowling ball increases speed from 2m/s to 6m/s while rolling down a hill. What is the momentum of the bowling ball?
32 Newton-seconds, 32 kg m/s^2 6m/s - 2 m/s = 4 m/s p= m x v 8kg x 4m/s = 32
400
In the graph below, the acceleration of an object is plotted against the net force on the object. What is the mass of the object?
2 kilograms The mass of the object is the ratio of the change of the acceleration to the change of the net force, which is the slope of the graph. The slope of the graph (and the mass) is 2 m/sec2 per newton or 2 kilograms.
400
What is the source of centripetal force for a race car driving on a circular track?
Friction between the tires and track
400
How can a ping pong ball and a bowling ball have the same momentum?
Since the ping pong ball is less massive, it would need to be traveling proportionally faster then the bowling ball to have the same momentum.
500
Two bricks sit in their own boxes. One is Styrofoam, and one is mortar brick. Without lifting the boxes, how could you figure out which is the Styrofoam?
Bite it..... Noooooo. You could apply a push to each box and determine which one accelerates faster. The styrofoam box will accelerate faster because it has less mass and less inertia.
500
Explain why airbags in automobiles help to prevent injury.
In automobile accidents, passengers as well as drivers continue to travel in a straight line after the car has slowed drastically or even stopped quickly due to a collision. They often make contact with surfaces in the car that are very hard. A hard surface applies a large force over a short time to reduce velocity and momentum to zero. The airbag allows a smaller force to be applied over a longer time, resulting in the same impulse and change in momentum but with less serious injuries.
500
Mr. Nimmerguth tackles Mr. Lembesis with a force of 500N. Mr. Lembesis accelerates at a rate of 20m/s/s. What is the mass of Mr. Lembesis?
25 kg
500
Why is centripetal force a vector quanity?
centripetal force has both magnitude and direction.
500
What is the net force on a football when the center is holding it on the ground with a force of 20 N?
0.0N
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