Multiple Choice Online Test
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Newton's Laws I

1.) The acceleration of an object which is free to fall in a vacuum is ...

1 | equal to the product of force and mass.
2 | proportional to the mass of the object.
3 | independent to the mass of the object.
4 | proportional to the inverse of the mass of the object.

2.) Two asteroids, which are 10000 km apart, attract each other with a gravitational force of F. If the two asteroids move away from each other to a distance of 20000 km apart, how great will the gravitational force be?

1 | 1/4 F
2 | 1/2 F
3 | 2 F
4 | 4 F

3.) A girl and a boy pull in opposite directions on strings attached to each end of a spring balance. Each child exerts a force of 20N. What will the reading on the spring balance be?

1 | 0 N
2 | 10 N
3 | 20 N
4 | 40 N

4.) A person standing on a scaffold lowers an object of weight 250N by means of a rope, at constant speed. If the weight of the rope is negligible, the force that the person exerts is …

1 | constant and less than 250N
2 | equal to 250N
3 | less than 250N and decreasing
4 | greater than 250N

5.) When an apple falls from a tree, it drops to the ground because of the gravitational force between the apple and earth. F1 is the magnitude of the force exerted by the earth on the apple and F2 is the magnitude of the force exerted by the apple on the earth, then ...

1 | they have equal inertia.
2 | F1 is greater than F2.
3 | F1 is smaller than F2.
4 | F1 and F2 are equal.

6.) An astronaut picks up a stone on the moon and finds its mass to be 2 kg. If the mass of the earth is 6 times more than the mass of the moon, what will the mass and the weight of the stone be on the earth?

| Mass | Weight
1 | 2 kg | 12 N
2 | 2 kg | 20 N
3 | 12 kg | 120 N
4 | 20 kg | 200 N

7.) Three objects of masses 0,5 kg, 10 kg and 3 kg are suspended by a light rope as shown in the diagram below. What is the magnitude of the force acting in the rope at point D?

1 | 13,5 N
2 | 18 N
3 | 130 N
4 | 135 N

8.) An object is suspended from a spring balance in a lift. The reading of the balance is 200N when the lift is at rest. If the balance reading is 190N, the lift is moving ...

1 | downward at constant speed.
2 | downward and increasing in speed.
3 | upwards at constant speed.
4 | downward and decreasing in speed.

9.) The sketch shows a block of wood being dragged across a rough horizontal surface at a constant speed by a force F. The magnitude of the frictional force between the block and the surface is …

1 | zero
2 | equal to F
3 | less than F
4 | greater than F

10.) A passenger not wearing a safety belt hits the windscreen of a car in a head-on collision. This is an illustration of …

1 | Newton's First Law
2 | Newton's Second Law
3 | the Law of Conservation of Momentum
4 | Newton's Universal Law of Gravitation

Results

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