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Physics Sem 1 Review

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4. What is the equation for an object in constant velocity?
V = D/T (Velocity) = (Displacement)/(Time)
49. what information does momentum give you about an object?
The momentum gives you the mass and the veloctiy of the object.
29) What is meant by equilibrium?
It is an object that is either at rest or moving with constant velocity.
31. What does the Second Law state?
The Secon Law states that the acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the objects mass.
3. How would you set up a conversion factor to convert units?
initial * new / initial

ie. centimeters * inches/ centimeters
10. What are the 2 equations for (constant) acceleration?
v = v(i) + a(∆t)
x = ½a(∆t)² + v(i)(∆t)
56. In what situations is momentum conserved?
collisions and explosions
31. What does the 2nd Law state?
more net force, more acceleration
more mass, less acceleration
What is meant by equilibrium?
net force = 0
27. What is the equation to calculate weight?
w = mg
26. What unit is weight usually measured in?
N
24. What unit is mass usually measured in?
kg
14. How do objects fall in free fall?
constant acceleration
9. What are the unsual units for acceleration?
m/s2
3. HOw would you set up a conversion factor to convert units?
The numerator should have the units you want, and the denominator should have the units you want to change
12. What do you draw on a motion diagram?
tracks, velocity arrows, and acceleration arrows
34. What it Friction? In what direction does it point?
Friction is restrictive force that keeps an object moving. Friction points in the opposite direction of where the object is moving to.
13. What is Free Fall?
Falling without air resistance
40. What is the relationship between the directions of action-reaction forces?
The action force is equal in magnitude but opposite in direction .Example:If the forces are equal between the nail and hammer the dircetion should be opposite to the force the hammer exerts on the nail.
7. What is the difference between speed and velocity?
Speed is just a measure of how fast something is. Velocity is a measure of how fast something is along with the directions it's traveling in.
21. What does net force mean?
It's the vector sum of all the forces acting upon an object. (Basically the total force + its direction.)
Calculation Answers 67-71
67. 17.15 m/s 68. 183.67 kg m/s, 18.37 N 69. 7.5 m/s 70. velocity arrows getting smaller to the right, acceleration arrow to the left 71. N perp to slope, W stright down, F(net) down the slope
Calculation Answers 61 -66
61. 3 m/s 62. 22.5 m 63. 1.07 m/s2 64. 39 m 65. 30.61 kg 66. 5 m/s2
43. What information does energy give you about an object?
How much work or damage it can do
37. What is Tension?
Tension is the force exerted by a pulled string, rope or similar device.
54. What is the equation for the Impulse-Momentum Theorem?
I = ∆p
58. What determines what a person feels on a roller coaster?
the net force
44. What is the usual unit for energy?
Joules, J
51. What is an impulse?
push/pulled over time
33. what are the usual units for force?
Newtons, N
47. What is momentum?
how hard it is to stop an object
39. What is the relationship between the magnitudes of the action-reaction forces?
equal
35. What is the Equation of Friction
F(f) = μN
46. What are the different types of energy?
(Non Mechanical)
Chemical, Thermal, Light, Sound, Nuclear, Electrical
46. What are the different types of energy?
(Mechanical)
Kinetic Energy, Potential Energy
8. What is the definition of acceleration?
The rate of change of velocity.
36. What is normal force? In what direction does it point?
Normal force is a force exerted by a surface in a direction perpendicular to the surface of contact.
52. What is the equation for impulse?
force x time interval,
I = F(∆t)
28. What would an object naturally do if it was left on its own?
Newton's 1st Law - An object at rest wants to stay at rest, and an object in motion continues in motion with constant velocity (that is, constant speed in a straight line) unless object experiences a net external force.
45. What does the Conservation of Energy Theorem state?
The Conservation of Energy Theorem states that the total amount of energy in any isolated system remains constant but can't be recreated, although it may change forms, e.g. friction turns kinetic energy into thermal energy.
1. What does directly proportional mean?
as one variable increases (or decreases), the other increases (or decreases) as well
59. What determines how fast a car is going at any point in a roller coaster?
Kinetic and Potential Energy
42. What is the equation for PE (potential energy)?
PE=mgh
30. Can something in equlibrium be moving? Why or why not?
Yes, it can move with constant velocity
53. What is the usual units for impulse?
N*S
11. Is a car that is driving in circles with constant speed accelerating? Why or why not?
The car is accelerating because when it goes in circles, the direction it faces is always changing, which affects its velocity.
18. If a ball is thrown up straight up in free fall, how does the time to get to the top compare with the time to reach the bottom?
In free fall, the time it takes to get to the top is the same as falling back down to the bottom.
48. What is the equation for momentum?
momentum = mass * velocity

(p) = (m) * (v)
41. What is the KE Equation?
KE = 1/2 x (mass) x (velocity^2)
60. What does the Egg Drop project demonstrate?
The longer you delay a collision, the less force it will have on an object (i.e the egg).
5. What are the usual units for velocity?
m/s
25. What is weight?
Weight-the magnitude of the force of gravity acting on an object.
22. What does the First Law of motion say?
An object tends to stay at a constant velocity and in a straight line unless acted upon by something.
17. If a ball is thrown up straight up, what is its speed at the top of its path?
zero
6.What's the difference between displacement and distance?
Distance is the scalar value of how far an object has traveled regardless of direction.
Displacement is the vector value of how far an object has been displaced, meaning how far is it from where it started.

In other words, distance shows no direction such as north, south, etc. while displacement does.
20. What do you draw in a free-body diagram?
You draw the object with the arrows pointing in the direction of the forces acting upon it. Ex: weight down and normal up if an object is at rest on the ground.
15. How do objects fall in air resistance?
The object's velocity will increase falling down until it reaches terminal velocity.
16.
What is an object's acceleration in free fall?
9.8 m/s2
2.What does inversly proportional mean?
Inversely preportional means that variables in an equation are inversely related, and as one grows the other will shrink or visversa. In the speed eqation S=d/t,speed(S) and time(t) are inversely proportional.
50. What are the usual units for momentum?
Kg * m/s
19. what are the 4 commonm forces that act on an object?
Normal
Weight
Tension
Friction
57. How can you lessen the force of impact in a collision?
If the time interval in which the object is brought to a stop is prolonged, then there wwill be less force in the collision. For example, if an egg hits a hard surface there will be a larger force of impact then if it was thrown at a sheet or pillow.
55.What does the Conservation of Momentum Theory state?
The law states that in a collision between object 1 and object 2, the total momentum of the two objects is equal before and after the collision.
38. What does Newton's third law state?
If two objects interact, the magnitude of the force exerted on object 1 by object 2 is equal to the magnitude of the firce simultaneously exerted on object 2 by object 1, and these two forces are opposite in direction.
32.
What is the equation for the 2nd Law?
A=Fnet/m (acceleration = net force/mass)
23. What is mass?
Mass is the amount of matter an object has. Hooray!
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