laws of Motion

Normal Reaction force is a _________ type of force.

• contact

• non-contact

Force exerted due to collision is ________ type of force

• non-contact

• contact

The property by virtue of which a body tends to retain its state of rest or motion is called _____

• inertia
• acceleration
• force
• momentum

when the bus suddenly starts moving, the passengers standing tends to fall backwards. This example explains _____________ law

• Law of Universal Gravitation
• Newton's Third Law of Motion
• Newton's Second Law of Motion
• Newton's First Law of Motion

The force needed to stop a moving body in a definite time depends on ________ & _________

• mass & velocity

• energy & momentum
• time & speed
• velocity & friction

acceleration =

• acceleration = mass x velocity
• acceleration = distance / time
• acceleration = (initial velocity + final velocity) / 2
• acceleration = (final velocity - initial velocity) / time

Force =

• mass x acceleration

• rate of change of momentum

• mass x velocity

• distance/time

A body of mass 20 kg is moving with velocity of 8 m/s, calculate its linear momentum

• 1600

• 2.5 kg m/s

• 160 kg m/s

A force of 20 N acts on a body of mass 7 kg. how much acceleration will be produced?

• 140 m/sq s

• 2.85

  140 m/sq s

• 1400

• data is not sufficient

To move the boat ahead in water, the boatman has to push the water _______ by his oar.

• forward

• backward