Ideas in Physics. Happy Solving!!!
1. Momentum is the product of mass and velocity.
2. The centripetal force in a uniform circular motion is equal to the product of mass and the square of the velocity over radius.
3, Pressure is equal to the density multiplied to the acceleration due to gravity and multiplied to the height.
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Wednesday, December 26, 2012
Monday, December 10, 2012
Parada National High School Physics: Submission December 13, 2012
Physics: Newton's Third Law of Motion
Imagine that you are holding a box weighing 5 N at rest on the palm of
your hand. Complete the following:
a) A downward force of magnitude 5 N is exerted on the box by
_____________________
b) An upward force of magnitude _______ is exerted on
__________________ by the hand.
c) Is the upward force (b) the reaction to the downward force (a)?
d) The reaction to force (a) is a force of magnitude _________, exerted
on__________ by __________________. Its direction is
_______________.
e) The reaction to force (b) is a force of magnitude _________, exerted
on__________ by __________________. Its direction is
_______________.
f) That the forces (a) and (b) are equal and opposite is an example of
Newton’s _____________ law.
g) That the forces (b) and (e) are equal and opposite is an example of
Newton’s _____________ law.
Suppose now that you exert an upward force of magnitude 7 N on the box.
h) Does the box remain in equilibrium?
i) Is the force exerted on the box by the hand equal and opposite to the
force exerted on the box by the earth?
j) Is the force exerted on the box by the earth equal and opposite to the
force exerted on the earth by the box?
k) Is the force exerted on the box by the hand equal and opposite to the
force exerted on the hand by the box?
Finally, suppose that you snatch your hand away while the box is moving
upward.
l) How many forces then act on the box?
m) Is the box in equilibrium?
Source: http://www.phys.cwru.edu/courses/p115/practice/Newton_Laws.pdf
University Physics by Freedman
Imagine that you are holding a box weighing 5 N at rest on the palm of
your hand. Complete the following:
a) A downward force of magnitude 5 N is exerted on the box by
_____________________
b) An upward force of magnitude _______ is exerted on
__________________ by the hand.
c) Is the upward force (b) the reaction to the downward force (a)?
d) The reaction to force (a) is a force of magnitude _________, exerted
on__________ by __________________. Its direction is
_______________.
e) The reaction to force (b) is a force of magnitude _________, exerted
on__________ by __________________. Its direction is
_______________.
f) That the forces (a) and (b) are equal and opposite is an example of
Newton’s _____________ law.
g) That the forces (b) and (e) are equal and opposite is an example of
Newton’s _____________ law.
Suppose now that you exert an upward force of magnitude 7 N on the box.
h) Does the box remain in equilibrium?
i) Is the force exerted on the box by the hand equal and opposite to the
force exerted on the box by the earth?
j) Is the force exerted on the box by the earth equal and opposite to the
force exerted on the earth by the box?
k) Is the force exerted on the box by the hand equal and opposite to the
force exerted on the hand by the box?
Finally, suppose that you snatch your hand away while the box is moving
upward.
l) How many forces then act on the box?
m) Is the box in equilibrium?
Source: http://www.phys.cwru.edu/courses/p115/practice/Newton_Laws.pdf
University Physics by Freedman
Thursday, November 1, 2012
Physics Problem Sets for School Year 2012-2013 Parada National High School. Enjoy Physics!
Physics Problem Sets. Love Physics!
1. An antelope moving with constant acceleration covers the distance between two points 80.0 m apart in 7.00s. Its speed as it passes the second point is 20.0 m/s. a) What is its speed at the first point? b) What is the acceleration?
2. The catapult of the aircraft carrier USS Abraham Lincoln accelerates an F/A – 18 Hornet jet fighter from rest to a take-off speed of 170 mi/h in a distance of 320 ft. Assume constant acceleration. a) Calculate the acceleration of the fighter in m/s2. b) Calculate the time required for the fighter to be accelerated to take-off speed.
3. An airplane travels 500m down the runway before taking off. If it starts from rest, moves with constant acceleration, and becomes airborne in 8.98 s, what is its speed in m/s, when takes off?
4. If a flea can jump straight up to a height of 0.525 m, what is its initial speed as it leaves the ground? b) For how much time is it in the air?
5. A player kicks a ball with a velocity of 42 m/s, 37ยบ from the horizontal. Find:
a. the maximum height the ball could reach.
b. the time to reach the maximum height.
c. the time the ball is in the air.
d. the range.
6. A car has a mass of 2000 kg. It is traveling at a velociyty of 15 m/s northward. A delivery truck with a mass of 3200 kg moving 18 m/s southward collided head-on with the delivery car. They stick together after collision. Find their common velocity after the collision.
7. A tricycle has a mass of 200 kg. If it has a velocity of 9 m/s northward, what is its momentum? If a car has a mass of 1800 kg, what should be its velocity to have the same momentum with the car.
8. A stone with a mass of 0.81 kg is attached to one end of a string 0.90 m long. The string will break if its tension exceeds 600N. The stone is whirled in a horizontal circle on a frictionless table top; the other end of the string is kept fixed. Find the maximum speed the stone can attain without breaking the string.
9. A nail weighs 0.2254 if it is in air and 0.1245N if it is submerged in oil with a density of 800 kg/m3. What is the density of the nail?
10. What is the pressure on the bottom of an aquarium 0.30 m deep filled with water?
ENJOY PHYSICS CLASS! Enjoy Solving Physics Problems.
SOLVE THE FOLLOWING PHYSICS QUESTIONS AND SUBMIT IT TO YOUR PHYSICS CLASS ON JANUARY 7, 2013 TO YOUR PHYSICS TEACHER.
1. An antelope moving with constant acceleration covers the distance between two points 80.0 m apart in 7.00s. Its speed as it passes the second point is 20.0 m/s. a) What is its speed at the first point? b) What is the acceleration?
2. The catapult of the aircraft carrier USS Abraham Lincoln accelerates an F/A – 18 Hornet jet fighter from rest to a take-off speed of 170 mi/h in a distance of 320 ft. Assume constant acceleration. a) Calculate the acceleration of the fighter in m/s2. b) Calculate the time required for the fighter to be accelerated to take-off speed.
3. An airplane travels 500m down the runway before taking off. If it starts from rest, moves with constant acceleration, and becomes airborne in 8.98 s, what is its speed in m/s, when takes off?
4. If a flea can jump straight up to a height of 0.525 m, what is its initial speed as it leaves the ground? b) For how much time is it in the air?
5. A player kicks a ball with a velocity of 42 m/s, 37ยบ from the horizontal. Find:
a. the maximum height the ball could reach.
b. the time to reach the maximum height.
c. the time the ball is in the air.
d. the range.
6. A car has a mass of 2000 kg. It is traveling at a velociyty of 15 m/s northward. A delivery truck with a mass of 3200 kg moving 18 m/s southward collided head-on with the delivery car. They stick together after collision. Find their common velocity after the collision.
7. A tricycle has a mass of 200 kg. If it has a velocity of 9 m/s northward, what is its momentum? If a car has a mass of 1800 kg, what should be its velocity to have the same momentum with the car.
8. A stone with a mass of 0.81 kg is attached to one end of a string 0.90 m long. The string will break if its tension exceeds 600N. The stone is whirled in a horizontal circle on a frictionless table top; the other end of the string is kept fixed. Find the maximum speed the stone can attain without breaking the string.
9. A nail weighs 0.2254 if it is in air and 0.1245N if it is submerged in oil with a density of 800 kg/m3. What is the density of the nail?
10. What is the pressure on the bottom of an aquarium 0.30 m deep filled with water?
ENJOY PHYSICS CLASS! Enjoy Solving Physics Problems.
SOLVE THE FOLLOWING PHYSICS QUESTIONS AND SUBMIT IT TO YOUR PHYSICS CLASS ON JANUARY 7, 2013 TO YOUR PHYSICS TEACHER.
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