CW Nov 30, What is gravitational potential energy? List five types of energy.
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1 CW Nov 30, 2018 What is gravitational potential energy? List five types of energy. What are the two different types of energy? Describe their differences. Explain why objects fall faster the longer they fall (ignoring air resistance).
2 CW Nov 30, 2018 What is gravitational potential energy? List five types of energy. Light, sound, heat, kinetic, gravitational potential, chemical potential, elastic potential and nuclear. What are the two different types of energy? Describe their differences. Kinetic is due to movement. Potential is due to position. Explain why objects fall faster the longer they fall (ignoring air resistance). The higher an object, the greater its gravitational potential. When free to fall, this is converted into kinetic energy. Kinetic energy is proportional to speed.
3 Learning objectives Recall and use the expression (change in) gravitational potential energy (Δ)Ep = mg(δ)h
4 Mr Douch loves to practice football. He does this by heading a bowling ball. The more energy the ball has, the better practice it will be. What could I do to maximise the energy and help Mr Douch improve?
5 Mr Douch loves to practice football. He does this by heading a bowling ball. The more energy the ball has, the better practice it will be. What could I do to maximise the energy and help Mr Douch improve?
6 Mr Douch loves to practice football. He does this by heading a bowling ball. The more energy the ball has, the better practice it will be. What could I do to maximise the energy and help Mr Douch improve?
7 Gravitational potential energy is the energy of an object due to its height above the ground (change in) gravitational potential energy, J gravitational field strength, N/kg ΔE p = mgδh mass, kg (change in) height, m Define the terms for the gravitational potential energy equation What equation is this very similar to? Show what a joule is in terms of MKS units
8 Define the terms for the gravitational potential energy equation. See previous slide. What equation is this very similar to? W = Fd Show what a joule is in terms of MKS units. kg m/s 2 E p = mgδh J = kg N kg m W = Fd J = Nm F = ma N = kg m s 2 J = kg m s 2 m J = kg m2 s 2
9 How much gravitational potential energy do you gain when you climb up stairs 15 m high. Assume you have a weight of 800 N. A Mars Bar contains has 1 MJ of energy. How high could you climb if a 75 kg climber converts all the chemical potential energy into gravitational potential energy? The mountain climber reaches the top of the mountain. It is a large flat plateau. He walks 320 m around the plateau. How much gravitational potential energy does he use?
10 How much gravitational potential energy do you gain when you climb up stairs 15 m high. Assume you have a weight of 800 N. A Mars Bar contains has 1 MJ of energy. How high could you climb if a 75 kg climber converts all the chemical potential energy into gravitational potential energy? The mountain climber reaches the top of the mountain. It is a large flat plateau. He walks 320 m around the plateau. How much gravitational potential energy does he use? J 1.3 km 0 J
11 Tension Normal Friction Weight θ
12 0.1 m Height, h θ How can we work out the height WITHOUT measuring?
13 SOH-CAH-TOA 0.1 m Height, h θ opp h sin θ = = hyp 0.2m h sin θ = 0.2m h = 0.2sin θ
14 Angle / º sinθ Change in height / m Gravitational potential energy / J m =?
15 Angle / º sinθ Change in height / m Gravitational potential energy / J m =?
16 Learning objectives Recall and use the expression (change in) gravitational potential energy (Δ)Ep = mg(δ)h
17 Drag mg E k = 1/2 mv 2 E p = mgh E p = 0.19 x 10 x 17 = 32 J E k = 1/ x (13) 2 = 16 J X W = Fd = 32 J
18
19 Work is done Against friction As the slide is not smooth E p = mgh = 90 kg x 10 N/kg x 15 m E = J E p = E k E k = 1/2 mv 2 = 1/2 x 90 kg x v J = 1/2 x 90 kg x v 2 (2 x J / 90 kg) 1/2 = v v = 17.6 m/s
20 What is gravitational potential energy? Write down your best answer to this question. Include any key words or diagrams you think are necessary.
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