Mechanics (Physics A Level Edexcel)

What is Work?

• Force x Distance

• Force x Time

• When a body moves because of a force

• When a body moves a certain amount because of the force applied and the time it's applied for

What is Energy?

• The movement of a body because of a force

• E = ft

  E = 1/2mv^2

  W = df

• The ability for a body to do work

• E = 1/2mv^2

  W = fd

  E = mgh

The velocity at which an object falls depends on its mass. (Providing that there is no air resistance)

• True

• False

If a ball is dropped from 10m, what is its final velocity?

• Cannot Calculate

• 10kms-1

• 14ms-1

• 10ms-2

What is the base unit for the Joule?

• kg^2 m s^-1

• kg m^2 s^-2

• kg ms^-2

• J

Which one of these is a base quanitity?

• Force

• Nm^-1

• kg m^2 s^-2

• Distance

How do you calculate efficiency?

• useful power out / total in

• total power in - useful out / total in

• unused power/total in

• useful out - useless out / total in

How do you calculate power?

• F x s

• P = Et

• P = E / t

• F /s

Which quantity is a scalar?

• velocity

• displacement

• speed

• force

Which would increase the turning effect

• Increase the distance

• Reduce the effort

• Reduce the force and the distance to the pivot

• increase distance of force to pivot and increase the force applied