3 (a) (i) Which of these forces keeps the Moon moving around the Earth?
A contact
B electrostatic
C gravitational
D magnetic
(ii) Which of these is a scalar quantity?
A velocity
B momentum
C energy
D acceleration
(b) Figure 4 shows a box at rest on a floor - Edexcel - GCSE Physics Combined Science - Question 3 - 2018 - Paper 1
Question 3
3 (a) (i) Which of these forces keeps the Moon moving around the Earth?
A contact
B electrostatic
C gravitational
D magnetic
(ii) Which of these is a scalar quant... show full transcript
Worked Solution & Example Answer:3 (a) (i) Which of these forces keeps the Moon moving around the Earth?
A contact
B electrostatic
C gravitational
D magnetic
(ii) Which of these is a scalar quantity?
A velocity
B momentum
C energy
D acceleration
(b) Figure 4 shows a box at rest on a floor - Edexcel - GCSE Physics Combined Science - Question 3 - 2018 - Paper 1
Step 1
Which of these forces keeps the Moon moving around the Earth?
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Answer
The correct answer is C gravitational. The gravitational force exerted by the Earth is what keeps the Moon in orbit around it. This force acts as the centripetal force needed for circular motion.
Step 2
Which of these is a scalar quantity?
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Answer
The correct answer is C energy. Energy is a scalar quantity as it has magnitude but no direction, unlike velocity, momentum, and acceleration, which are vector quantities.
Step 3
Add another vector to the diagram in Figure 4 to show the weight of the box.
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Answer
To show the weight of the box in Figure 4, we need to add a downward vector from the center of the box labeled 'weight of the box'. This vector should be equal in magnitude to the upward force exerted by the floor to signify equilibrium.
