Physics

The product of the mass of a body and the rate of change of its displacement is called......................

• force

• momentum

• acceleration

• weight

A horizontal force of 24 N acts on a body of mass 5 kg to move it on a horizontal surface

with acceleration of 3 m/s, then the magnitude of the friction forces equals...............................

• 6N

• 8N

• 9N

• 39N

The ratio between the acting force on the body and the rate of change of its velocity

according to Newton's second law is the....................

• momentum of the body.

• mass of the body.

• energy of the body.

• acceleration of the body.

A car of mass 240 kg starts its motion from rest on a straight horizontal road under the effect of a force of 750 N, so its velocity reached 5 m/s after a distance of 10 m, then

the friction force between the car and the surface of Earth=....................

• 150N

• 200N

• 300N

• 450N

An object of mass 0.5 kg begins a free fall motion from the top of a building so that it O strikes the ground 4 s later, hence the momentum of the object at the moment of striking the ground equals.................................

(Take: g = 10 m/s²)

• 10 kg.m/s

• 20 kg.m/s

• 30 kg.m/s

• 40 kg.m/s

A space probe has a mass of 225 kg. If the acceleration due to gravity on the surface of the Moon is 1.62 m/s², the weight of the probe when it lands on the Moon will equal.................

• 138.9 N

• 225 N

• 364.5 N

• 450 N

A body has a mass of 50 kg on the surface of Earth where the acceleration due to

gravity equals 9.8 m/s², thus: The weight of the body on the surface of Earth equals...............

• 5N

• 5.1 N

• 490 N

• 500 N

In the opposite figure, four forces are acting on a mass of 10 kg. If the mass is moving with an acceleration of 10 m/s², the magnitude of force F equals......................

• 50 N

• 100 N

• 150 N

• 200 N

A wooden block of mass 2 kg moves on a horizontal surface when it is affected by a horizontal force of 6 N. If the magnitude of frictional force is 2 N, the acceleration of motion equals................

• 6 m/s²

• 2 m/s²

• - 3 m/s²

• -4 m/s²