Introduction to Forces (Lambda)

Which of the following statements is FALSE about force?

• Force is a vector quantity.

• Force is an interaction among at least 3 bodies.

• Force is an interaction between bodies.

• Gravity is a non-contact force.

Answer explanation

Force is a vector quantity and it arises due to the INTERACTION of at least two (2) bodies.

Which does not belong to the group.

[friction, spring force, electricity, applied force]

• friction

• spring force

• electricity

• applied force

Answer explanation

All of the choices are contact forces except ELECTRICITY.

Electricity is a non-contact force.

Which does not belong to the group?

[electricity, magnetism, tension, gravity]

• electricity

• magnetism

• tension

• gravity

Answer explanation

All are non-contact forces EXCEPT tension.

Tension is a contact force.

The relative strength of the electromagnetic force is _________ that of the strong nuclear force.

• 1/1000

• 1000

• 0.001

• 0.01

Answer explanation

Electromagnetic force is 1/100th, 0.01, OR 10^-2 in magnitude/strength compared with the strong nuclear force.

The radioactive decay of your isotopes is governed by which fundamental force?

• strong nuclear force

• weak nuclear force

• radioactive force

• electromagnetic force

Answer explanation

The fundamental force which governs radioactive decay (e.g, Carbon-14 to Nitrogen-14) is the WEAK NUCLEAR FORCE.

The weight of an object can be attributed to which fundamental force?

• strong nuclear force

• electromagnetic force

• weak nuclear force

• gravity

Answer explanation

The weight of an object is due to the force of gravity.

Friction force can be attributed to which fundamental force?

• strong nuclear force

• electromagnetic force

• weak-nuclear force

• gravity

Answer explanation

Friction can be understood in terms of the fundamental force : electromagnetism.

Friction is the result of ELECTROMAGNETIC INTERACTION between atoms at the contact surface.

Arrange in ascending order of the force's strength.

• strong nuclear force

• gravity

• weak nuclear force

• electromagnetic force

Which does not belong to the group?

[applied force, tension, electrostatic, air resistance]

• applied force

• tension

• electrostatic

• air resistance

What distinguishes contact from non-contact forces?