Friction and Acceleration

Friction and Acceleration

Newton's 2nd law

• Newton's Second Law of Motion states, “The force acting on an object is equal to the mass of that object times its acceleration.”

• Acceleration is the rate at which the object is changing its speed (speeding up or slowing down)

Multiple Choice

Newton's force equation - which is correct?:

• The amount of force equals the mass multiplied by the acceleration of the object (F=m x a)

• The amount of force equals the inertia (mass) of the object (F= m)

Multiple Choice

Which wagon will require more force to move?

• Top wagon, because it has more weight.

• Top wagon, because it has more mass.

• Bottom wagon, because it has more weight.

• Bottom wagon, because it has more mass.

Multiple Choice

Will it take more force to push an empty shopping cart or a shopping cart that is full?

• The empty shopping cart
• The full shopping cart
• They will take the same amount of force

Multiple Choice

Which shopping cart will have more acceleration?  

• The empty shopping cart
• The shopping cart that's full
• They will be the same

Multiple Choice

Acceleration is a change in...

• Inertia
• Gravity
• Velocity
• Distance

Multiple Choice

Why would one ball travel a greater distance than the other when pushed with the same amount of force?

• Different sizes
• Different weights
• Different masses
• Different forces

Multiple Choice

If the man pushes with an equal amount of force, which object will accelerate more?

• Car because it has more mass

• Lawnmower because it has less mass

• Car because it has less mass

• Lawnmower because it has more mass

Multiple Choice

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease.

• The marble’s speed would increase.

• The marble would stop immediately.

• The marble would remain at constant speed.

Multiple Choice

How can friction be reduced?

• reduce the force acting between the 2 surfaces
• reduce the roughness of the 2 surfaces coming in contact
• use wax, grease or oil
• all of the above are ways of reducing friction

Multiple Choice

What does friction produce?

• light
• sound
• heat
• gravity

Multiple Choice

The amount of friction depends on the weight of the objects pressing together.

• True
• False

Multiple Choice

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Multiple Choice

A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate

• surface area

• air resistance

• descent velocity

• gravity

Multiple Choice

Swimming fish experience-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

Multiple Choice

What type of friction starts with an object that is not yet moving?

• static

• sliding

• fluid

• rolling

Multiple Choice

Wheels on a skateboard most likely experiences-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

Multiple Choice

A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate

• surface area

• air resistance

• descent velocity

• gravity