Forces and Simple Machines Quiz

A third-grade class with 24 students is playing tug of war with a rope against their teacher. Which of the following BEST describes what will happen?

• The 24 students and the teacher will tie since their forces are balanced.

• The results cannot be predicted since balanced and unbalanced forces are random.

• The teacher will win since the forces are balanced. She will have more force compared to 24 students.

• The 24 students will win since their forces are unbalanced. They will have more force compared to one teacher.

A student says that whenever he kicks a soccer ball in the air, the force of gravity impacts the ball. Which statement below shows the force of gravity on the ball?

• The soccer ball moves quickly when he kicks it.

• The soccer ball slows down and falls back to the ground.

• The soccer ball goes toward the sky when he kicks it.

• The goalie catches the soccer ball.

Ms. Adams is moving classrooms, and she wants the move to be as easy as possible. Which simple machine should Ms. Adams use to move heavy items from the classroom?

• She should use a wheel and axle to move items from one room to another.

• She should use a lever to move items from one room to another.

• She should use a pulley to move items from one room to another.

• She should use a wedge to move items from one room to another.

Which of the statements below is an example of friction?

• When you erase a mistake on a test.

• Rubbing your hands together to warm them up in the winter.

• Rubbing two sticks together to create fire.

• All of the above.

This is the push, pull, or twist that changes the motion of an object:

• Force

• Motion

• Gravity

• Friction

Gravity is a force that helps us:

• Stay in constant motion

• Float in space

• Keep our feet on the ground

• Slow down a marble rolling on the carpet

Which of the following is NOT an example of a simple machine?

• A screw

• A pulley

• A washing machine

• A wheel and axle

Which of the following is an example of an unbalanced force?

• A car parked on a hill.

• A person sitting on a chair.

• A book lying on a table.

• A ball thrown in the air.