1. A man is descending in a parachute of total mass 125 kg with a constant velocity. What is the air resistance the parachutist experiences? (Points :2)
Zero N
1225 N
2450 N
4900 N
2. A block of mass 5 kg is descending with a constant velocity on an inclined plane at 30°. What is the value of the frictional force? (Points :2)
12.2 N
24.5 N
42.3 N
49.0 N
3. A block of mass 5 kg is placed on a rough table having a coefficient of static friction μs = 0.2.What is the force required to move the block? (Points :2)
5.0 N
10 N
9.8 N
49.0 N
6. Two physics books A and B are placed one over the other on a table. The mass of A is 2 kg and mass of B is 1 kg. Book A is placed on book B. What is the reaction book B exerts onto book A? (Points :2)
9.8 N downwards
19.6 N upwards
9.8 N upwards
19.6 N downwards
7. Two blocks A and B are placed one over the other on a table. The mass of A is 5 kg and mass of B is 10 kg. Block A is placed on block B. What is the reaction the table gives onto the blocks? (Points :2)
49 N upwards
98 N downwards
147 N upwards
49 N downwards
8. The net force on a sailboat is 252 N, while the wind exerts a force of 325 N. What is the water-resistant force acting on the sailboat? (Points :2)
73 N
252 N
325 N
577 N
9. A parachutist of mass 75kg descends with an acceleration of 8 m/s2. What is the upward force exerted by the air on the parachutist? (Points :2)
600 N
735 N
135 N
Zero N
10. A boy pulls a toy cart of mass 2 kg with a force of 3 N at an angle of 60° with respect to the horizontal road. What is the acceleration produced by the cart? (Points :2)
0.75 m/s2
1.5 m/s2
6 m/s2
5 m/s2
Zero N
1225 N
2450 N
4900 N
2. A block of mass 5 kg is descending with a constant velocity on an inclined plane at 30°. What is the value of the frictional force? (Points :2)
12.2 N
24.5 N
42.3 N
49.0 N
3. A block of mass 5 kg is placed on a rough table having a coefficient of static friction μs = 0.2.What is the force required to move the block? (Points :2)
5.0 N
10 N
9.8 N
49.0 N
6. Two physics books A and B are placed one over the other on a table. The mass of A is 2 kg and mass of B is 1 kg. Book A is placed on book B. What is the reaction book B exerts onto book A? (Points :2)
9.8 N downwards
19.6 N upwards
9.8 N upwards
19.6 N downwards
7. Two blocks A and B are placed one over the other on a table. The mass of A is 5 kg and mass of B is 10 kg. Block A is placed on block B. What is the reaction the table gives onto the blocks? (Points :2)
49 N upwards
98 N downwards
147 N upwards
49 N downwards
8. The net force on a sailboat is 252 N, while the wind exerts a force of 325 N. What is the water-resistant force acting on the sailboat? (Points :2)
73 N
252 N
325 N
577 N
9. A parachutist of mass 75kg descends with an acceleration of 8 m/s2. What is the upward force exerted by the air on the parachutist? (Points :2)
600 N
735 N
135 N
Zero N
10. A boy pulls a toy cart of mass 2 kg with a force of 3 N at an angle of 60° with respect to the horizontal road. What is the acceleration produced by the cart? (Points :2)
0.75 m/s2
1.5 m/s2
6 m/s2
5 m/s2