(a) Which of these is the equation for work done?
A
work done = force ÷ distance moved in direction of force
B
work done = force × distance moved in direction of force
C
work done = force ÷ distance moved at right angles to direction of force
D
work done = force × distance moved at right angles to direction of force
(b) A ball has a mass of 0.046 kg - Edexcel - GCSE Physics: Combined Science - Question 5 - 2019 - Paper 1
Question 5
(a) Which of these is the equation for work done?
A
work done = force ÷ distance moved in direction of force
B
work done = force × distance moved in direction ... show full transcript
Worked Solution & Example Answer:(a) Which of these is the equation for work done?
A
work done = force ÷ distance moved in direction of force
B
work done = force × distance moved in direction of force
C
work done = force ÷ distance moved at right angles to direction of force
D
work done = force × distance moved at right angles to direction of force
(b) A ball has a mass of 0.046 kg - Edexcel - GCSE Physics: Combined Science - Question 5 - 2019 - Paper 1
Step 1
Which of these is the equation for work done?
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Answer
The correct answer is B: work done = force × distance moved in direction of force.
Step 2
Calculate the change in gravitational potential energy when the ball is lifted through a vertical height of 2.05 m.
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Answer
Using the equation
ΔGPE=m×g×Δh
where:
m = 0.046 kg
g = 9.81 m/s²
Δh = 2.05 m
Therefore,
ΔGPE=0.046imes9.81imes2.05=0.92extJ
Step 3
Calculate the kinetic energy of the ball when the speed of the ball is 3.5 m/s.
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Answer
The kinetic energy (KE) can be calculated using the formula:
Use Figure 7 to estimate the maximum height that the ball reaches after the first bounce.
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Answer
By observing Figure 7, the maximum height reached after the first bounce is estimated to be between 0.8 m and 0.95 m.
Step 5
Explain why the ball does not bounce back to its starting height of 2.05 m.
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Answer
The ball does not return to its starting height of 2.05 m because energy is lost during each bounce. This loss can be due to various factors such as:
Energy being transferred to the surroundings (sound, thermal energy).
The system not being 100% efficient.
The bounce being non-elastic.
Step 6
Describe how the maximum height reached changes with the bounce number in Figure 8.
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Answer
As the bounce number increases, the maximum height reached decreases. There is a negative correlation observed between the bounce number and maximum height, indicating a non-linear relationship.
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