Forces and Motion

What is a force?

• A push or a pull

• A simple machine

• Only small motions

• When you work hard

How can you tell when a force has been applied to an object?

• Only when an object is pushed

• When the object's position changes

• Only when an object is pulled

• Only when an object accelerates

What is speed?

• When two surfaces rub against each other

• The force that keeps your feet on the ground

• The rate at which an object travels

• How much something weighs

Which of the statements below is an example of friction?

• Erasing a mistake on a test

• Pushing on the brakes to slow down a car

• Rubbing two sticks together to start a fire

• All the above

Why do we sometimes want to prevent friction?

• To make it easier to move an object

• To keep an object from moving

• To increase temperature

• To decrease temperature

The _____________________ the force, the more movement it can produce.

• Greater

• Smaller

• Slower

• None of the above

What is friction?

• The speed of an object

• A push or a pull

• A force that opposes the motion of one object moving past another

• A change in speed or direction

What is acceleration?

• Speed and acceleration are the same thing

• A change in speed or direction over time

• A balanced force

• When an object slows down only

What is a balanced force?

• A push or a pull

• Forces that act on an object without changing it's postion

• Balanced forces and unbalanced forces act the same way

• Friction

What is an unbalanced force?

• Gravity

• A push only

• Forces that do not cause an object to change it's position

• Forces that do not cancel each other out and cause an object to change it's motion