Higher Physics Checklist To Date 1.Errors booklet questions 1 - 6 in problem jotter (blue)...
-
Upload
anissa-mckinney -
Category
Documents
-
view
212 -
download
0
Transcript of Higher Physics Checklist To Date 1.Errors booklet questions 1 - 6 in problem jotter (blue)...
Higher Physics Checklist To Date1. Errors booklet questions 1 - 6 in problem jotter
(blue)2. “Adding Vectors” Tutorial 1 in problem jotter.
(This tutorial can be found in the homework booklet and a pdf file of the answers is also attached here)
3. Unit 1 Problems 14 - 22 on Adding Vectors, in problem jotter.
4. HOMEWORK 1 (1995 Past Paper Q1 handout) - should be done in RED HW jotter and submitted for marking.
5. Unit 1 Problems 23 - 26 on Resolving Vectors, in problem jotter.
6. “Resolving Vectors” Tutorial 2 (Q.1 & 2) in problem jotter.(This tutorial can be found in the homework booklet and a pdf file of the answers is also attached here)
Resolving Vectors (recap)
Components of a Vector
Any single vector can be split into 2 vectors at right angles to each other.
Eg)
Resolving Vectors
Components of a Vector
Any single vector can be split into 2 vectors at right angles to each other.
Eg)
Resolving Vectors
Components of a Vector
Any single vector can be split into 2 vectors at right angles to each other.
Eg)
Objects on a Slope
If an object accelerates in some direction, then the force making it accelerate must be in the same direction.
For example, a mass (m) on a frictionless slope which makes an angle, , with the horizontal …
m
NOTES p.6
m
The force acting on the mass is “gravity” which is the downwards “weight” of the mass … W = mg.
W = weight in Newtons (N) m = mass in kg g = gravitational field strength in N/kg)
W = mg
`
m
BUT the force affecting the motion of the mass on the slope is the DOWNSLOPE COMPONENT OF WEIGHT.
W = mg
mg(perpendicular
component)
So …
Downslope component of weight = opp = hyp sin = mg sin
(perpendicular comp. = mg cos)
2kg
Example
A 2kg mass is released on a slope which makes a 30o angle with the ground. A frictional force of 4N acts upslope. Calculate the acceleration of the mass.
mg sin
4N
2kgmg sin
4N
1st downslope weight = mg sin
= 2 x 9.8 x sin 30
= 9.8N
2nd unbalanced force = FR = 9.8N – 4N
= 5.8N, downslope
3rd Fu = 5.8N, downslope
m = 2 kg
a = ?
a = Fu / m
= 5.8 / 2
= 2.9 m/s2, downslope
So far, the following “Vectors” questions should be completed
Tutorial 1 (all)
Tutorial 2 (all)
Problems 14 – 22 (addition of vectors)
Problems 23 – 26 (resolving vectors)
+
Homework 1995 Past Paper Q1
Tutorial 1
1.a) 9.9N, 4.95 ms-2 3. a) 4.47ms-1 @ 333o b) 4ms-1 @ 030o
4.a) b) 20.5ms-1 @ 73o from the horizontal
Tutorial 2
1a) H – 18.8 ms-1, V – 6.8 ms-1 c) H – 17.7 ms-1, V – 17.7 ms-1
e) H – 0 ms-1, V – 30 ms-1 2. a) 346N b) 230N c) 11N d) 7.9N
e) 3.46N f) 13.8N 3.a)(i) 0.02ms-2 ii) 1.35ms-2 iii) 2.14ms-
2
iv) 1.54ms-2 v) 5.05ms-2 b) 19.9o
Problems 14 – 22 (addition of vectors)
Problems 23 – 26 (resolving vectors)
Tutorial 2 - see HW booklet
Tutorial 1 see HW booklet