The gravitational force of any object near Earth is _____?

A unknown
B friction
C Newton's First Law
D 9,8m/s2

When you walk across a bridge, the _____ force of the bridge keeps it from breaking.
A gravitational
B normal
C strong
D weak

A (n) _______________ helps reduce sliding friction.

Normal force is supplied by the ___________ of the surface,

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C and d

A video shows the objects in the solar system orbiting the sun. Why do objects orbit the sun.

A. The sun is so bright that objects are forced away.
B. The sun is moving so quickly that other objects move around it.
C. The sun is releasing heat and pushing objects away.
D. The sun is so massive that it has the most gravity.

The gravitational force of any object near Earth is option D: 9.8m/s^2.

To calculate gravitational force, we use Newton's law of universal gravitation. The formula is F = G * ((m1 * m2)/r^2), where F is the gravitational force, G is the gravitational constant (approximately 6.67430 × 10^-11 N * (m/kg)^2), m1 and m2 are the masses of the objects, and r is the distance between the centers of the objects. In this case, one of the objects is Earth, and the other object is the one near Earth.

The gravitational force of Earth near its surface is approximately 9.8 m/s^2. This value is often referred to as acceleration due to gravity, as it represents the acceleration experienced by any object near the Earth's surface when falling freely.

When you walk across a bridge, the force that keeps it from breaking is option B: normal force.

Normal force is the force exerted by a surface to support the weight of an object resting on it. In the case of a person walking across a bridge, the normal force is the force exerted by the bridge to counteract the weight of the person and keep the bridge stable. This force prevents the bridge from breaking or collapsing under the weight.

A(n) option B: normal force helps reduce sliding friction.

Sliding friction is the resistance encountered when two surfaces slide against each other. Normal force plays a crucial role in reducing sliding friction. When an object rests on a surface, the normal force exerted by the surface creates a perpendicular force that pushes the object against the surface. This increased contact force enhances the frictional force between the surfaces, helping to reduce sliding. The normal force acts in the opposite direction to the sliding force, generating friction that prevents objects from slipping easily.

Normal force is supplied by the option B: surface on which the object rests.

The surface on which an object rests supplies the normal force. The normal force is always perpendicular to the surface and acts in the opposite direction to the force of gravity. It counteracts the weight of the object and supports it against the surface. The surface must have the strength to withstand and exert an equal and opposite force to the object's weight in order to provide an adequate normal force.