Physics Assessment G 10

Grade 10 Physics Practice: Forces, Motion, Gravitation!

Please write your name As a space ship of constant mass moves towards the Earth, the force of the gravitational interaction between the Earth and the space craft increases decreases stays the same none of the above Two objects with masses of 1 kg and 2 kg respectively are separated by a distance of 1 m. The magnitude of the gravitational force between the objects is: Slightly less than G double that of G Equal to G slightly greater than G Which Newton’s Law states that any two masses attract each other’s with a force that is directly proportional to their masses and inversely proportional to the square of the distance between them? First Law: Law of inertia Second Law: Fundamental law Third Law: Principle of interaction Fourth Law: Law of gravitational attraction Two spherical objects have equal masses and experience a gravitational force of 25 N towards one another. Their centers are 36 cm apart. Determine the mass m of each object. Given G=6.67×10-11 SI units m=4.84×1010kg m=2.2×105kg m=2.2×1010kg m=3.6×106kg A net force F is applied on an object of mass m. The object accelerates due to this force. The acceleration a of the object Decreases as the mass m of the object decreases increases as the force F on the object increases Remains constant as the mass m increases Remains constant as the force F increases An object has constant acceleration. Choose the correct statement describing this object The object is changing its motion The object has zero velocity There are no forces acting on the object The object has zero net force acting on it. An object is initially placed on a friction-less plane, inclined by an angle θ. The object slides down the inclined plane with constant acceleration a=5m the duration taken by the mass to move a distance of 10 m down the incline. Given g=10 m 1 second 2 seconds 4 seconds 16 seconds Choose the change that would increase the acceleration of mass m sliding down a friction-less inclined plane. Increasing the mass of m Increasing the length of the inclined plane Increasing the angle of the inclined plane All of the above Calculate the value of the gravity g for the space shuttle 200 km above the surface of the Earth. The mass of the Earth is M=6×1024kg and its radius R=6.38×106m.Given: G=6.67×10-11 SI units g=0 N g=9.2 N g=10 N g=9284836.61 N Suppose that a cart is being moved by a certain net force. If a load is dumped in to the cart so its mass is doubled. The statement that describes the acceleration is The acceleration decreases by half The acceleration will stay the same The acceleration doubles The acceleration will be multiplied by 4 A horizontal force of 50 N is required to push a crate across a factory floor at constant speed. The force of friction acting on the crate is 0 N 50 N 100 N The answer depends on the speed of the crate The SI unit of the Universal gravitational constant G is N. m N.m2 N. m N.kg When a solid is pseudo- isolated, then a possible time equation of its motion is x=5t2+2t+1 x=5t+3 v=t2+4 v=5t-2 The ball slides with a constant velocity down an inclined plane that makes an angle 30⁰ with the horizontal. The weight of the ball is W=500 N. The normal reaction of support has a magnitude: Fnorm = 125N Fnorm =250 N Fnorm =433 N Fnorm = 500 N A block of mass (4 m) can move without friction on a horizontal table. This block is attached to another block of mass (m) by a string that passes over a friction-less pulley. If the masses of the string and the pulley are negligible, calculate the magnitude of the acceleration of the descending block (m) in terms of the gravity g? g g g g An elevator of mass 550 kg. If the elevator accelerates upwards at a rate of 4.0 m Calculate the tension in the support cable lifting the elevator car? Use g = 10 m 1600 N 3300 N 4400 N 7700 N A block of mass m is pulled along a horizontal surface at constant speed v by a force Fapp , which acts at an angle of θ with the horizontal. The normal force exerted on the block by the surface is: mg - Fapp cosθ mg- Fapp sinθ mg Fapp sinθ Determine which of the four blocks has the smallest net force acting on it. A force of 2N to the leftA force of 2N to the leftA force of 4N to the right A force of 4 N to the leftA force of 16 N to the right A force of 5N to the leftA force of 20 N to the leftA force of 10 N to the rightA force of 10 N to the right A force of 2N to the leftA force of 2N to the leftA force of 4 N to the leftA force of 6 N to the right The force that pulls falling objects toward Earth is called Free fall Gravitational attraction Air resistance acceleration The tendency of an object to resist change in its state of motion is known as Mass Inertia Force Balance