Forces Test Ch. 12

The size of the gravitational force between two objects depends on their______.

• frictional forces

• inertia

• speed and direction

• masses and the distance between them

in the absence of air, a penny and a feather that are dropped from the same height at the same time will

• float

• not have momentum

• fall at the same rate

• fall at different rates

Gravity causes all falling object to accelerate at a rate of

• 98 m/s/s

• 9.8 m

• 98 m

• 9.8 m/s/s

According to Newton's second law of motion

• F =p x v

• F = m x a

• F = m x v

• F = p x a

In the equation p = m x v, the p represents ___.

• momentum

• inertia

• position

• friction

An object in free fall seems to be

• speeded up by free fall

• not moving

• weightless

• slowed by air resistance

A feather will fall through the air more slowly than a brick because of

• gravity

• air resistance

• inertia

• momentum

A real car moving at 10 km/h has more momentum than a toy car at the same speed because the real car

• has less mass

• has greater mass

• has greater forward motion

• generates less friction

If gravity did NOT affect the path of a horizontally thrown ball, the bal would

• travel horizontally

• go straight up

• fall straight down

• follow a curved path

The relationship among mass, force, and acceleration is explained by

• Newton's first law

• Newton's second law

• Newton's third law

• conservation of momentum