1.
State what is meant by Newton's law of gravitation.
[1 mark]
- F = Gm₁m₂/r²
JD SCIENCE
Fields and their consequences
Indicative marking points. Award marks for equivalent scientific or mathematical wording. Do not issue this sheet with the student worksheet.
2.
State what is meant by gravitational field strength.
[1 mark]
- g = F/m = GM/r²
3.
State what is meant by gravitational potential.
[1 mark]
- V = −GM/r
4.
State what is meant by Coulomb's law.
[1 mark]
- F = kQq/r²
5.
State what is meant by electric field strength.
[1 mark]
- E = F/Q = kQ/r²
6.
State what is meant by capacitance.
[1 mark]
- C = Q/V
7.
State what is meant by magnetic flux.
[1 mark]
- Φ = BA cosθ
8.
State what is meant by Faraday and Lenz.
[1 mark]
- ε = −N dΦ/dt
9.
State what is meant by a charged particle in a B field.
[1 mark]
- F=BQv, circular path
10.
State what is meant by orbital motion of satellites.
[1 mark]
- gravity = mv²/r
11.
Amira is asked about Newton's law of gravitation in a AQA Physics paper.
(a) [2 marks]
- always attractive
(b) [3 marks]
- inverse square
12.
Amira is asked about gravitational field strength in a AQA Physics paper.
(a) [2 marks]
- N kg⁻¹
(b) [3 marks]
- equals free-fall acceleration
13.
Amira is asked about gravitational potential in a AQA Physics paper.
(a) [2 marks]
- work done per kg from infinity
(b) [3 marks]
- equipotentials
14.
Amira is asked about Coulomb's law in a AQA Physics paper.
(a) [2 marks]
- attract or repel
(b) [3 marks]
- same inverse-square idea
15.
Amira is asked about electric field strength in a AQA Physics paper.
(a) [2 marks]
- uniform field E=V/d
(b) [3 marks]
- between plates
16.
Amira is asked about capacitance in a AQA Physics paper.
(a) [2 marks]
- parallel plate C=εA/d
(b) [3 marks]
- energy ½QV
17.
g=GM/r². M=6.0×10²⁴, r=6.4×10⁶, G=6.67×10⁻¹¹
[3 marks]
- Final answer: 9.8 N kg⁻¹
18.
E=V/d. 12 V, 4.0 mm
[3 marks]
- Final answer: 3000 V m⁻¹
19.
C=Q/V. 6.0 µC, 3.0 V
[3 marks]
- Final answer: 2.0 µF
20.
½QV for those values
[3 marks]
- Final answer: 9.0 µJ
21.
F=BQv. B=0.20, Q=1.6×10⁻¹⁹, v=3.0×10⁶
[3 marks]
- Final answer: 9.6 × 10⁻¹⁴ N
22.
ε=NΔΦ/Δt. N=50, ΔΦ=0.040, Δt=0.10
[3 marks]
- Final answer: 20 V
23.
Amira carries out a AQA-style required practical linked to gravitational, electric and magnetic fields. This is a typical AQA required-practical style question.
(a) [2 marks]
- Independent: the independent variable for this topic
- Dependent: the measured outcome
(b) [2 marks]
- keep all other variables constant
- so the test is fair / only one variable is changed
(c) [2 marks]
- repeat and calculate a mean / use a tighter method
24.
Amira carries out collecting valid data for gravitational, electric and magnetic fields. This is a typical AQA required-practical style question.
(a) [2 marks]
- Independent: a chosen factor
- Dependent: a quantitative measurement
(b) [2 marks]
- calibrated instrument
- so the test is fair / only one variable is changed
(c) [2 marks]
- systematic error from zero error
25.
Amira carries out drawing a graph for gravitational, electric and magnetic fields. This is a typical AQA required-practical style question.
(a) [2 marks]
- Independent: x-variable
- Dependent: y-variable
(b) [2 marks]
- same scale / same apparatus
- so the test is fair / only one variable is changed
(c) [2 marks]
- not drawing a line of best fit through the trend
26.
Amira carries out evaluating a method about gravitational, electric and magnetic fields. This is a typical AQA required-practical style question.
(a) [2 marks]
- Independent: method change
- Dependent: precision / accuracy
(b) [2 marks]
- same sample size
- so the test is fair / only one variable is changed
(c) [2 marks]
- too few repeats
27.
Compare Newton's law of gravitation with gravitational field strength.
[4 marks]
- F = Gm₁m₂/r²
- g = F/m = GM/r²
- give one linked difference
28.
Compare gravitational field strength with gravitational potential.
[4 marks]
- g = F/m = GM/r²
- V = −GM/r
- give one linked difference
29.
Compare gravitational potential with Coulomb's law.
[4 marks]
- V = −GM/r
- F = kQq/r²
- give one linked difference
30.
Compare Coulomb's law with electric field strength.
[4 marks]
- F = kQq/r²
- E = F/Q = kQ/r²
- give one linked difference
31.
Apply your knowledge of magnetic flux to this situation: weber
[3 marks]
- weber
32.
Apply your knowledge of Faraday and Lenz to this situation: opposes the change
[3 marks]
- opposes the change