Forces and Motion

What is generally the net force on an object?

• The force of the object being pushed in a certain direction.

• The force on an object is the sum of all forces acting on the object.

• All forces in the universe.

Why is it important to find the net force on an object?

• We like to see how much it weighs.

• It is important to find the net force because it allows you to predict how an object’s motion will change.

• It allows you to calculate the acceleration rate of the object.

Newton’s first law of motion: states that an object at rest stays at rest, and an object in..........stays in with a constant velocity unless acted on by unbalanced forces

What is the difference between a balanced force and an unbalanced force?

• A balanced force has a net force of 0 N. An unbalanced force has a net force that is unequal to 0 N.

• When a force moves the the object its concidered balanced.

• Unbalanced forces are equal to zero.

Check all that are true.... Are the forces on an object in motion balanced?

• Yes, forces acting on object in motion can be balanced forces as long as the object is moving at the same speed in the same direction

• If the object changes speed or direction, then the forces acting on it become unbalanced.

• Forces are only balanced when the object is at rest.

Newton’s second law of motion: states that an object’s ......... is equal to the net force on the object divided by its mass.

What is the formula for Force?

• Velocity = Distance / Time

• F = ma (Force = Mass x Acceleration)

• D = M/V (Density = Mass/Volume)

What does the following equation represent: a = ^F/_{m ?}

• The equation represents Newton’s third law of motion, which states that acceleration is equal to net force divided by velocity.

• This is not a real equation.

• The equation represents Newton’s second law of motion, which states that acceleration is equal to net force divided by mass.

What is friction?

• Friction helps to increase the acceleration of an object.

• Friction is a force that opposes the motion between two surfaces that are touching.

• Friction is when something has static electricity.

Newton’s third law of motion: states that when an object exerts a force on a second object, the second object exerts a force on the first object with equal strength, but in the ....... direction.