Flashcards
P2.3 Flashcards
Flashcards do conjunto (25)
- 1What is the SI unit of work done?Joule, J
- 2What is the work done on an object if a force of 300N moves it a distance of 8m?2400J
- 3What is the increase in Ep when a mass of 40kg is lifted 8m vertically?320 J
- 4It takes 2 seconds to lift the object in Question 1. What is the power developed?160 W
- 5A boy of mass 40kg runs at a speed of 5m/s. What is his kinetic energy?500J
- 6When a spring is squashed and released it warms up. Why?Some elastic potential energy is transferred by heating
- 7When do objects have momentum?When they are moving
- 8What is the momentum of a 1000 kg car travelling at 30m/s?30000 kg m/s
- 9What is the total momentum after an explosion equal to?The total momentum before the explosion
- 10Two students on roller skates stand holding each other in the playground. They push each other away. What can you say about the momentum of each student?It is equal and opposite
- 11What is impact time?Time taken for a collision to take place
- 12Why do cars have crumple zones at both the front and the rear?Cars may be hit from either the front or the rear, in either case the crumple zone reduces the forces on the car (or increases the impact time)
- 13What happens to a passenger in a head-on collision if they are not wearing a seatbelt?They continue to move forwards when the car stops and will hit the windscreen
- 14What happens to a passenger in a head-on collision if they were wearing a very narrow seatbelt?The narrow seatbelt would not spread the force across the passengers body and might cut them
- 15When is work done by a force?When a force moves through a distance
- 16What is the relationship between work and energy?Work done = energy transferred
- 17What is the unit of power?Watt, W
- 18What is the decrease in gravitational potential energy when an object of mass 6kg is lowered through a distance of 9m?54 J
- 19What is elastic potential energy?The energy stored in an elastic object when it is stretched or squashed
- 20What is the kinetic energy of a car of mass 1200kg travelling at 30 m/s?540000J
- 21What is the unit of momentum?kg m/s or Ns
- 22What is the momentum of a 2500kg truck travelling at 20m/s?50000kg m/s
- 23Why is a gymnast less likely to injure herself if she lands on a thick foam mat than if she lands on a hard floor?The thick foam mat increases the impact time compared with the hard floor, reducing the force on the gymnast
- 24An electric motor is used to raise a 0.1kg mass vertically upwards. If the mass gains 2J of gravitational potential energy, calculate the height it is raised through2.0m
- 25A trolley of mass 0.2 kg travelling at 1.5m/s to the right collides with a stationary trolley of mass 0.3kg. After the collusion they move off together. Calculate the velocity of the trolley after the collision0.6m/s to the right
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- GCSE Physics (Unit 2) FlashCards sobre P2.3 Flashcards, criado por Mel Hughes em 26-08-2016.
- Criado por
- Mel Hughes
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