1. The normal force is always less than or equal to force of gravity
a) True
b) False
2. What is the value of the normal force? (there is an image of a box with a mass of 10kg and it is sitting on a flat horizontal surface)
a) 98 N [up]
b) 98 N [down]
c) 10 N [up]
d) 10 N [down]
3. pool table has a mass of 600 kg. In an attempt to move it, Peter exerts an upward force of 1000 N on the poor table. What is the normal force now acting on the pool table?
a) 5880 N
b) 6880 N
c) 4880 N
d) 400 N
1. The correct answer is b) False. The normal force is always equal and opposite to the force of gravity when an object is at rest on a flat surface.
2. Since the box is sitting on a flat horizontal surface, the normal force exerted on the box is equal to the force of gravity acting on it, which is the box's weight. Therefore, the correct answer is b) 98 N [down].
3. The normal force on an object is equal to the force applied to it by its surroundings. In this case, since Peter exerts an upward force of 1000 N on the pool table, the normal force will be equal and opposite, so the correct answer is c) 4880 N.
1. The correct answer is b) False. The normal force is equal to and opposite to the force of gravity acting on an object. The normal force is the force exerted by a surface to support the weight of an object. In the case where an object is on a flat horizontal surface and not moving vertically, the normal force is equal in magnitude and opposite in direction to the force of gravity. This is known as Newton's third law of motion.
2. To find the value of the normal force in this scenario, we need to consider that the normal force is equal in magnitude and opposite in direction to the force of gravity. The force of gravity (weight) can be calculated using the formula: weight = mass * gravitational acceleration. In this case, the mass is 10 kg, and the gravitational acceleration is approximately 9.8 m/s^2. Therefore, weight = 10 kg * 9.8 m/s^2 = 98 N. The normal force would be equal in magnitude but in the opposite direction, so the correct answer is d) 10 N [down].
3. In this scenario, Peter exerts an upward force of 1000 N on the pool table. The normal force is the force exerted by the surface to support the weight of the pool table. The weight of the pool table can be calculated using the formula weight = mass * gravitational acceleration. In this case, the mass is 600 kg, and the gravitational acceleration is approximately 9.8 m/s^2. Therefore, weight = 600 kg * 9.8 m/s^2 = 5880 N. Since Peter is exerting an upward force of 1000 N on the pool table, the normal force needs to balance this upward force with an equal and opposite force (downward). So, the normal force is equal to the weight of the pool table (5880 N) plus the upward force applied by Peter (1000 N). The total normal force is therefore 5880 N + 1000 N = 6880 N. Therefore, the correct answer is b) 6880 N.
1. A)
1- b) False
2 -c) 10 N [up]
3 - d) 400 N