1. (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 1 - 2019 - Paper 1
Question 1
1. (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 directi... show full transcript
Worked Solution & Example Answer:1. (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 1 - 2019 - Paper 1
Step 1
Which of these is the equation for work done?
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Answer
The correct equation for work done 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
To calculate the change in gravitational potential energy (ΔGPE), we use the equation:
ΔGPE=m×g×h
Where:
m = 0.046 kg (mass of the ball)
g = 9.81 m/s² (acceleration due to gravity)
h = 2.05 m (height)
Now substituting the values:
ΔGPE=0.046imes9.81imes2.05ΔGPE≈0.93extJ
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) of an object can be calculated using the formula:
KE=21mv2
Where:
m = 0.046 kg (mass of the ball)
v = 3.5 m/s (velocity of the ball)
Substituting the values:
KE=21×0.046×(3.5)2KE=0.28extJ
Step 4
Explain what happens to the energy of the ball when it is released.
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Answer
When the ball is released, it converts gravitational potential energy into kinetic energy as it falls. However, as it moves, some of this energy is dissipated due to air resistance, sound, and heat due to friction. Thus, not all of the potential energy is converted into kinetic energy, indicating that the system is not 100% efficient.
