Accelerating in the direction of F1

Newton's Third Law states...

For every action, there is an equal and opposite reaction.

Describe the motion of this car

constrant speed, then stationary, then lower constant speed

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S5 August Revision

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Questions 21

Answers

1
In this diagram, what expression gives the component of the weight perpendicular to the slope?
W⊥ = mg sin Θ
W⊥ = mg sec Θ
W⊥ = mg cos Θ
W⊥ = mg tan Θ
2
List all quantities that are vectors
Speed
Potential Energy
Acceleration
Force
3
What does the slope of the line of a speed v. time graph tell us?
the object's velocity
the object's displacement
the object's speed
the object's acceleration
4
Which of these is not a suvat equation?
s=u+at
s=ut+1/2 at2
v2=u2+2as
v=u+at
5
You can use SUVAT when...
acceleration is changing
acceleration is constant
6
State the scale reading uncertainty in the following voltmeter reading.
±0.25V
±0.5V
±1.0V
±5.5V
7
How could you reduce systematic error?
Calibrate the measuring device
Use more decimal places
Do repeated measurements
Find an average across many trials
8
constant acceleration due to gravity on earth
9.8 m/s
2.3 m/s2
14 m/s2
9.8 m/s2
9
In this diagram, what expression gives the component of the weight parallel to the slope?
W|| = mg tan Θ
W|| = mg cos Θ
W|| = mg sin Θ
W|| = mg sec Θ
10
A random error can be reduced by
Repeat readings
Cannot be reduced
Making experiment more safe
Calibrating equipment
11
What is the reading uncertainty in this reading?
0.01
0.0001
0.1
0.00005
12
What does the slope of the line on a distance v. time graph tell us?
The object's positon
the object's time
the object's distance
the object's speed
13
What is the horizontal component of this force?
50sin40
50cos40
50/cos40
50/sin40
14
Force Diagram
moving at constant speed in the direction of F1
Accelerating in the direction of F2
moving at constant speed in the direction of F2
Accelerating in the direction of F1
15
Newton's Third Law states...
For every action, there is a smaller reaction.
For every action, there is an equal and opposite reaction.
For every action, there is a larger reaction.
Every action is caused by force.
16
What is the vertical component of this force?
30cos15
30/cos15
30sin15
30/sin15
17
The uncertainty in a voltage reading is 13.6±1.7V. The percentage uncertainty is?
12.5%
15%
13.4%
4%
18
Which scientist laid down three laws of motion that still guide the science of physics today?
Galileo
Kepler
Newton
Copernicus
19
Describe the motion of this car
Constant speed, then stationary, then faster constant speed
Low speed, then stationary, then higher constant speed
constrant speed, then stationary, then lower constant speed
Stationary, then constant speed, then stationary
20
In SUVAT equations, "s" represents:
Distance
Time
Speed
Displacement
21
Which of these is NOT a SUVAT equation
s= ut + 1/2at2
s = 1/2 (u+v) t
u = v - at
v2 = u + 2as

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