Unit 10: Forces

Choose the properties of matter that contribute to an object's momentum (choose all that apply).

• Mass

• Density

• Volume

• Velocity

Mass is an intrinsic property of matter that is the measure if...

• The space of an object takes up.

• The force of gravity acting on an object.

• The amount of matter in an object.

• The amount of momentum an object has.

Weight is an extrinsic property of matter that is the measure if...

• The space of an object takes up.

• The force of gravity acting on an object.

• The amount of matter in an object.

• The amount of momentum an object has.

Inertia is described as an object's tendency to resist a change in its _______.

The more ______ an object has, the more inertia it has.

Static friction is the frictional force that prevents an object from moving and is caused by...

• The microscopic roughness of the two surfaces in contact.

• The attraction between the atoms on the two surfaces that are in contact.

• The roundness of the object (its ability to roll).

• The molecules of air colliding with the object.

Astronauts orbiting Earth appear to be weightless because...

• There is no force of gravity acting on them.

• They are in free fall, in a curved path around Earth.

• There is a smaller force of gravity acting on them.

• The Earth and Moon pull on them equally causing the gravitational forces to cancel out.

The equation for calculating   an object's momentum is _________.

• p=m/V, where m represents mass & V represents volume

• p=mg, where m represents mass & g represents the gravitational constant

• p=ma, where m represents mass & a represents acceleration

• p=mv, where m represents mass & v represents velocity

What is the momentum of a 0.10 kg mass moving with a speed of 20 m/s?

• 2.0 kg*m/s

• 2 kg*m/s

• 0.1 kg*m/s

• 10 kg*m/s

The amount of net force required to keep a 6 kg object moving rightward with a velocity of 4m/s is.....

• 0N

• 24N

• 6N

• 12N