Motion & Forces 2.1 - 3.1

_______ is the force of attraction between masses.

• Contact

• Gravity

• Acceleration

• Friction

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5

Friction is a force that resists motion between two surfaces that are pulled apart.

• True

• False

A skater applies a contact force as she pushes against the ground. The ground applies a _______ force that pushes the skater forward.

• friction

• contact

• gravity

Tags

NGSS.MS-PS2-2

Force is a vector because it has both size and direction.

• True

• False

The overall force acting on an object when all the forces are combined is called the _______.

• total force

• subjective

• net force

Tags

NGSS.HS-PS2-1

Balanced forces have the same effect as no force at all.

• True

• False

Tags

NGSS.HS-PS2-1

If you have balanced forces, the motion of the object does not change.

• True

• False

Tags

NGSS.HS-PS2-1

Only an unbalanced force can change the motion of an object.

• True

• False

Tags

NGSS.MS-PS2-2

If you ride a bike straight ahead at a constant speed, the force moving the bike forward exactly balances the forces of friction that would slow the bike down. If you stop pedaling, the forces are no longer balanced, and frictional forces slow you down until you eventually stop.

• True

• False

Tags

NGSS.MS-PS2-2

Newton's First law states that:

• acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

• objects at rest remain at rest and objects in motion remain in motion, unless acted upon by an unbalanced force.