CH3 PHYSICS FORCES AND MOTION

what is a force ?

• A force is a type of energy
• A force is a push or pull that can cause an object to change its speed, chemical properties or direction of the object that the force is acted upon

• The action of one body on a second body; unbalanced forces cause changes in speed, shape or direction

• A force is a type of sound

What is a Newton ?

• A type of fruit
• The force required to give a weight of 1 kg an acceleration of 1 m/s^2

• The force required to give a mass of

  1 kg an acceleration of 1 m/s^2

• A unit of weight which gives the weight required to give a mass of 10N a speed of 1 m/s

What is air resistance ?

• sss

• The friction acting on an object moving

  through air

• The air acting on an object while it is moving in the sky

• s

What is friction ?

• Friction is the force that helps the motion of an object
• Friction is the force that has no effect on the motion of an object
• Friction is the force that increases the speed of an object
• The force that acts when two surfaces rub over on another

What is drag ?

• The force that propels an object through a fluid
• The force that causes an object to float in a fluid
• The force that increases the speed of an object through a fluid
• Friction that acts on an object as it moves through a fluid

What is solid friction ?

• Resistance to motion caused when two surfaces are in contact

• Force that only affects liquid surfaces
• Force that has no effect on the relative motion of solid surfaces
• Force that helps the relative motion of solid surfaces

What are balanced forces ?

• Two forces acting in opposite directions on an object, and one is larger than the other.
• Two forces acting in random directions on an object, and they are not equal in size.
• Two forces acting in the same direction on an object, and they are equal in size.
• Two forces acting in opposite directions on an object, and they are equal in size.

What are unbalanced forces ?

• Forces that only affect an object's color.
• Forces that have no effect on an object's motion or shape.
• Forces that cause a change in an object's motion or shape.
• Forces that keep an object's motion or shape constant.

What are resultant forces ?

• Forces that change direction randomly
• Single force that can replace multiple forces acting on an object

• Forces that have no effect on an object
• Forces that cancel each other out

What happens to an object if it is at rest and forces are balanced ?

• It remains at rest
• It disappears
• It moves at a constant speed
• It accelerates