Review: Forces

Which of the following forces is non-contact?

• gravity

• friction

• applied

• tension

Which of the following is the SI unit of force?

• kilogram

• pound

• newton

• joule

Which law states that: an object at rest will remain at rest and an object in motion will continue to move with constant velocity unless acted upon by an unbalanced (net) force?

• law of acceleration

• law of inertia

• law of interaction

• law of conservation of energy

What happens to the acceleration of an object if the net force acting on it is doubled?

• nothing

• it will also double

• it will be halved

• it will be quartered

A force of 100N is applied to the east on the wall. What is the wall's reaction force to this?

• 100N, east

• 100N, north

• 100N, south

• 100N, west

What is the net force?

• 0

• 5N,west

• 15N

• 5N,South

The Second Law of motion triangle is shown. What is the formula for the mass (m)?

• Fa

• a/F

• F/a

• F+a

What force must act on a 50-kg object to give it an acceleration of 0.25m/s²?

• 12.5N

• 200N

• 0.005N

• 50.25N

Which of the following will accelerate the most if the same amount of force is applied on them?

• 10kg cotton

• 1kg concrete block

• 100kg feather

• 0.1kg nails

What is the relationship between net force and mass?

• equal

• directly proportional

• inversely proportional

• no relationship