What is the decrease in gravitational potential energy when an object of mass 6 kg is lowered through a distance of 9 m?
54 J
4 of 12
What is elastic potential energy?
The energy stored in an elastic object when it is stretched or squashed
5 of 12
What is the kinetic energy of a car of mass 1200 kg travelling at 30 m/s?
540 000 J
6 of 12
What is the unit of momentum?
kg m/s or Ns
7 of 12
What is the momentum of a 2500 kg truck travelling at 20 m/s?
50000 kg m/s
8 of 12
Why is a gymnast less likely to injure herself is she lands on a thick foam mat gains 2 J of gravitational potential energy, calculate the height it is raised through.
The thick foam mat increases the impact time compared with the hard floor, reducing the force on the gymnast.
9 of 12
The electronic motor in the question above has a power of 1.5 W. Calculate the time taken to raise the load.
2.0 m
10 of 12
A trolley of mass 0.2 kg travelling at 1.5 m/s to the right collides with a stationary trolley of mass 0.3 kg. After the collision they move off together. Calculate the velocity of the trolleys after the collision.
1.3 s
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A trolley of mass 0.2 kg travelling at 1.5 m/s to the right collides with a stationary trolley of mass 0.3 kg. After the collision they move off together. Calculate the velocity of the trolleys after the collision.
0.6 m.s to the right
12 of 12
Other cards in this set
Card 2
Front
What is the relationship between work and energy?
Back
Work done = energy transferred
Card 3
Front
What is the unit of power?
Back
Card 4
Front
What is the decrease in gravitational potential energy when an object of mass 6 kg is lowered through a distance of 9 m?
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