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P5: Quiz 6 – Answers
P5: Quiz 6 – Answers
1) work done = force x distance
w = f x d
Work done is in joules (J) or newton metres (Nm), force is in newtons (N) and distance is in metres (m)
w = f x d
Work done is in joules (J) or newton metres (Nm), force is in newtons (N) and distance is in metres (m)
2)
a) 120 J or 120 Nm
b)
i) The kinetic energy stores of the car
ii) The thermal energy stores of both the car and the carpet (or surroundings)
3)
a) 40 N
b) The temperature of the bottom of the box that is in contact with the floor will increase. This is because friction causes some of the energy to be transferred to the thermal energy stores of the box and the surroundings, which causes the temperature of the bottom of the box to increase
4) 84 cm
2)
a) 120 J or 120 Nm
b)
i) The kinetic energy stores of the car
ii) The thermal energy stores of both the car and the carpet (or surroundings)
3)
a) 40 N
b) The temperature of the bottom of the box that is in contact with the floor will increase. This is because friction causes some of the energy to be transferred to the thermal energy stores of the box and the surroundings, which causes the temperature of the bottom of the box to increase
4) 84 cm
Questions
1) Write down the equation that links force, work done and distance. Include the units for each of the values.
2)
a) I push a toy car across a carpet. I exert a force of 30 newtons and push the toy car 4 metres. Calculate the work done.
b) When I am pushing the toy car, energy is transferred from me to useful and wasted energy stores in the car and the surroundings.
i) What is the useful energy store that energy from me is transferred to?
ii) What is the wasted energy store that energy from me is transferred to?
3)
a) The work done to push a box 60 cm along a floor is 24 joules. Calculate the force applied to the box.
b) When the force is moving the box, what happens to the temperature of the bottom of the box that is in contact with the floor? Explain why this temperature change takes place.
4) A 63 N force is applied to an object which results in the object moving a certain distance. The work done by this force moving the object is 52.92 joules. Calculate the distance that the force moved the object. Give your answer in centimetres.
1) Write down the equation that links force, work done and distance. Include the units for each of the values.
2)
a) I push a toy car across a carpet. I exert a force of 30 newtons and push the toy car 4 metres. Calculate the work done.
b) When I am pushing the toy car, energy is transferred from me to useful and wasted energy stores in the car and the surroundings.
i) What is the useful energy store that energy from me is transferred to?
ii) What is the wasted energy store that energy from me is transferred to?
3)
a) The work done to push a box 60 cm along a floor is 24 joules. Calculate the force applied to the box.
b) When the force is moving the box, what happens to the temperature of the bottom of the box that is in contact with the floor? Explain why this temperature change takes place.
4) A 63 N force is applied to an object which results in the object moving a certain distance. The work done by this force moving the object is 52.92 joules. Calculate the distance that the force moved the object. Give your answer in centimetres.