Year 9 Physics P1 Motion Review Part 4

What is the first step a student should take to measure how the force applied to a piece of elastic affects its extension?

• Measure the new length of the elastic

• Suspend the piece of elastic from a horizontal support

• Calculate the extension

• Add more masses to the elastic

If a student measures the whole length of the elastic instead of the extension, what type of error will occur?

• Random error

• Systematic error

• Measurement error

• Calculation error

When the force on a spring is doubled, what happens to the extension of the spring?

• It stays the same

• It doubles

• It triples

• It decreases

What is required to cause an object to rotate?

• A force acting through the center of mass

• A force that does not act through the center of mass

• A balanced force

• No force at all

What is the name for the turning effect of a force?

• Torque

• Moment of a force

• Force

• Pressure

Which equation links the moment of a force, distance, and force in words?

• Force equals moment divided by distance

• Moment of a force equals force times distance

• Distance equals moment divided by force

• Moment equals distance divided by force

In symbols, how is the moment of a force expressed?

• M = F + d

• M = F - d

• M = F × d

• M = F / d

What are the standard units for the moment of a force?

• Joules (J)

• Newtons (N)

• Newton-metres (Nm)

• Metres (m)

How is the distance measured when calculating the moment of a force?

• The total length from the pivot

• The distance from the force to the pivot

• The perpendicular distance from the pivot to the line of action

• The average distance of all forces

If the clockwise moment about a pivot equals the anticlockwise moment, what can be said about the object?

• The object is moving

• The object is unbalanced

• The object is balanced

• The object is falling