Dynamics

What is the unit of force?

• Newton

• kg(m)

• m/s

• m/s^2

Tags

NGSS.MS-PS2-2

Any change in motion must be initiated by a(n) ________________ force.

• Balanced

• Contact

• Field

• Unbalanced

Tags

NGSS.MS-PS2-2

______________________: the branch of physics that studies forces and how they change an object's motion.

Tags

NGSS.MS-PS2-2

One newton accelerates ____________ of mass at 1 m/s^2

• 1kg

• 2kg

• 3kg

• 4kg

Tags

NGSS.MS-PS2-2

Match the following:

• Field force

• Takes place when an object rolls on the surface.

• Rolling friction

• Takes place when two surfaces are rubbed against each other.

• Contact force

• a force that acts between objects that are not touching.

• Static friction

• Occurs between two objects when they are not moving but are about to move

• Sliding friction

• a force that occurs between to objects that are touching.

The law of inertia states that...

• any object with mass also has inertia

• for every action force, there is an equal and opposite reaction force.

• objects will remain in their current state unless acted on by a net external force.

• the acceleration of an object is directly proportional to the net force acting on the object.

What happens to acceleration if you halve the mass of the object?

• Acceleration is halved

• Acceleration doubles

• Acceleration does not change

• Acceleration increases by 1/3

Tags

NGSS.MS-PS2-2

The weight of an object is dependent on which to factors?

• mass

• velocity

• gravity

• normal force

Tags

NGSS.MS-PS2-4

_____________________________: a force exerted by surface on an object perpendicular to the plane of contact.

An astronaut on the moon has ______________ than on the Earth. On the moon, g = 1.62 m/s^2

• a larger weight

• a smaller mass

• more weight

• less weight