Question bank: Chapter 3: Force and Motion

Force is measured using a:

A box is pulled by 45 N to the right and 15 N to the left. The resultant force is:

According to Newton's first law, an object keeps its state of rest or uniform motion in a straight line if:

A bicycle moves at constant velocity towards the east. The resultant force on it is:

Inertia is the tendency of an object to:

Passengers in a moving bus lean forward when the bus brakes suddenly because of:

Compared with a small bicycle at the same speed, a truck is harder to stop because it has greater:

When a train suddenly moves forward, a small bag under a seat moves, relative to the train:

A car moves steadily at 20 m/s; the engine force is 600 N. The total resistance is:

Momentum is the product of:

The unit of momentum is:

Momentum is a:

A 2 kg body moves at 5 m/s. Its momentum is:

Which has the greater momentum: a 1000 kg car at 10 m/s or a 500 kg car at 25 m/s?

Newton's second law states that the resultant force acting on an object equals the:

A resultant force of 12 N acts on a 4 kg body. Its acceleration is:

A body of mass 5 kg has an acceleration of 4 m/s². The resultant force is:

A force of 36 N gives a body an acceleration of 9 m/s². Its mass is:

One newton is equal to:

The dimensional formula of force is:

The same force acts on bodies of mass 2 kg and 6 kg. The ratio of their accelerations a₁ : a₂ is:

If the resultant force on a body is doubled (mass constant), its acceleration:

If the mass of a body is doubled while the force is constant, its acceleration:

The same force on a cube gives it an acceleration 3 times that of a second cube. The mass of the first compared with the second is:

The slope of the graph of acceleration (vertical) against resultant force (horizontal) for a body is:

The momentum of a 3 kg body changes from 6 to 30 kg·m/s in 4 s. The force is:

A 50 kg crate is pushed by 200 N against friction of 120 N. Its acceleration is:

A person falling onto water is less hurt than falling onto ground mainly because the water:

Airbags reduce injury in a collision because they:

An egg falls on a cushion and does not break because the cushion:

Which statement agrees with Newton's second law?

Newton's third law is expressed by:

The action and reaction forces:

A large truck collides with a small car. The force on the truck is, compared with that on the car:

Rocket propulsion depends on:

An astronaut in space throws a tool in one direction. The astronaut:

A book on a table: the reaction to the weight of the book (action of the Earth on the book) is:

Two skaters push each other apart with equal and opposite forces. The skater of smaller mass:

A resultant force of zero acting on a body corresponds to which of Newton's laws?