Sue pumps up a bicycle tyre. As she does so, she notices that the pump becomes hot.
(a) Where, and how, was the energy stored before it was transferred in pumping up the tyre? (Single choice)
1 As Chemical Energy in Sue or her muscles
2 As Potential Energy in Sue or her bones
3 As Kinetic Energy in Sue or her muscles
4 As Chemical Energy in Sue or her bones
(b) Explain how the gas molecules inside the tyre exert pressure on the walls of the tyre. Single choice.
1 The movement of molecules get slower
2 The molecules collide with the walls of the tyre
3 Molecules do not exert any pressure
4 There are no walls in the tyre
(c) The air going into the tyre was warmed up by the pumping. What effect will this have on the motion of gas molecules in the air in the tyre? Single choice.
1 No effect
2 They slow down
3 They speed up
4 The molecules break apart
(d) When the air in the tyre becomes hotter, the pressure rises. Give one reason, in terms of the motion of gas molecules in the air, why the pressure rises. Single choice.
1 more collisions
2 the molecules move faster
3 the molecules hit the tyre wall more frequently
4 Pressure will not rise
(e) The pressure in the tyre increases as Sue forces more air into the tyre. Explain why a larger number of gas molecules increases the pressure in the tyre. Single choice.
1 there will be more frequent collisions with the tyre wall
2 there will be more collisions with the tyre wall
3 there is less space for the molecules
4 there are more air molecules to hit the tyre wall
Will mark as brainlist if answer all correctly thank youuu! Please help me out :)
Answers
Answer:
a) 3 Kinetic energy in Sue on her muscles
b) 2Theolecules collide with the walls of the tires
c) 3 they speed up
d) 1 more collisions
e) 1
hope it helps u ....
Answer:
Sue pumps up a bicycle tyre.
(a) The energy is stored as Kinetic energy in Sue or in her muscle.
(b) The molecules collide with the walls of the tyre.
(c) They speed up.
(d) The pressure rises due to more collisions.
(e) The number of gas increases the pressure in the tyre as there will be more repeated collisions with the tire wall.
Explanation:
Sue pumps up her bicycle tyre.
(a) As the energy is transferred from Sue to the tyre and human body generates kinetic energy when in motion. The energy is stored in Sue or in her muscles as Kinetic energy.
(b) When gas particles collide with their container's walls, it results in gas pressure. The pressure increases as the frequency and speed at which the particles strike the walls increases. This explains why adding additional air causes the pressure in a tyre or balloon to increase.
(c) The speed of the gas molecules in the tyre increases as the kinetic energy increases due to the warmed air in the tyre.
(d) The air molecules in the tyre have more kinetic energy as the temperature rises, which causes them to move more quickly. The number of impacts with the tyre wall per second will grow as the molecules' speed increases. In turn, this causes an increase in force, which in turn increases the pressure on the tyre wall.
(e) When more and more air is pumped into the tyre, the speed of molecules increases and the area for each molecule to move freely decreases. This cause the molecules to collide frequently.
Therefore, a large number of gas molecules increases the pressure in the tyre.
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