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A rollercoaster carriage of mass 100kg has 45kJ of Kinetic Energy at the lowest point of its ride. Ignoring air resistance and friction between the wheels and the tracks, what is the maximum height above this point it could reach? [Take g as 10m/s/s)

[A useful tip: always start by drawing a diagram!!]This question is asking you to apply conservation of energy, i.e. at the highest point it can reach above the lowest point, all of this Kinetic Energy will ...
RW
Answered by Ross W. • Physics tutor
4356 Views

What is terminal velocity?

This is the maximum velocity that an object can reach when falling through a medium (like air). Note that it occurs when the drag on the object equals the pull of gravity.
RE
Answered by Richard E. • Physics tutor
3582 Views

A man decides to shoot a rifle whilst on a wheelchair. Explain in terms of conservation of momentum what happens to the man as the shot is fired.

Assume that initially the wheelchair is stationary. When the rifle is fired a bullet travels in the forward direction. Conservation of momentum states that the momentum before an action is the same as the mo...
MH
Answered by Matthew H. • Physics tutor
3706 Views

Trolley A weighs 5kg and is moving at 15m/s to the right. It collides with a stationary Trolley B, weighing 10kg more than Trolley A. After the collision they move off together. Calulate the velocity that they move off with.

To start with, we should work out all of the quantities we need: Mass of Trolley A: M A = 5kg Mass of Trolley B: B weighs 10kg more than A --> Therefore M B = 10 + 5 = 15kg Mass of Both Trolleys together:...
JD
Answered by Joshua D. • Physics tutor
8092 Views

what are the energy changes when a car rolls from the top of a hill to the bottom? Name two forces that would slow the acceleration of the car?

At first as the car is on the top of the hill, it has GRAVITATIONAL POTENTIAL ENERGY As the car rolls down the hill, GRAVITATIONAL POTENTIAL ENERGY changes to KINETIC ENERGY. Friction and Air resistance
SW
Answered by Shaun W. • Physics tutor
14002 Views