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Physics
GCSE

A car of mass 1000 kg is travelling at 15 m/s. The driver applies the brakes for 4 seconds, slowing the car to 5 m/s. What is the average power output of the brakes over the 4 seconds? Assume there are no other forces acting on the car.

Kinetic Energy, EK=(1/2)mv2. Energy is conserved, so the work done by the brakes, W, must be equal to the change in kinetic energy of the car, ∆EK. Therefore: W = ∆EK = (1/2)1000(15

AH
Answered by Adam H. • Physics tutor
8915 Views

If a box full of feathers and a box full of bricks were to be dropped at the same time and from the same height, which one would hit the ground first?

In a vacuum (no air): -Both boxes fall at the same rate and hit the ground at the same time. -Gravity accelerates all objects equally at 9.8 m/s², regardless of mass. In real-wor...

AY
12811 Views

Which is heavier, a ton of feathers or a ton of lead?

They're both the same. The feathers would take up a lot more space though! Feathers have a lower density than lead (i.e. for the same volume, feathers are less heavy). In practice, if you drop a tonne of ...

FN
Answered by Francis N. • Physics tutor
16355 Views

Define Newton's three laws

1st Law - a body will move with constant velocity or remain at rest unless acted on by a resultant force
2nd Law - F = ma. The rate of change of momentum of an object is equal to the resultant force ...

GW
Answered by George W. • Physics tutor
2054 Views

The focal length of the lens is 10 cm. Calculate the power of the lens. State the unit.

first, convert to metres:10cm = 0.1mlens power = 1/focal lengthpower = 1/0.1 =10units are Dioptres, Dso the power of the lens is 10 D

AH
Answered by Aleks H. • Physics tutor
3205 Views

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