Contact Forces
A student pushes a desk across the classroom. What type of force is being used?
What is A push/contact force.
What does it mean when an object is in motion?
What is Its position is changing?
A force can change an object's __________.
What is Motion?
What is a force?
What is A push or a pull?
A student pushes a toy truck. The truck moves forward. What caused the truck to move?
What is The student's force/push?
A soccer player kicks a ball. Is the force a push or a pull?
What is Push ?
A car travels 10 meters in 2 seconds. Is the car moving?
What is Yes?
Name one way a force can change an object's motion.
What is Make it start moving, stop, speed up, slow down, or change direction?
What is motion?
What is A change in an object's position?
Students push identical blocks with different amounts of force. What should they measure to determine how the force affected motion?
What is How far or how fast the blocks moved?
Two students play tug-of-war. What type of force is being demonstrated?
What is Pull/contact force?
Which object has greater speed: a bicycle traveling 5 meters per second or a scooter traveling 3 meters per second?
What is The bicycle?
A baseball is moving toward a batter. The batter hits it in the opposite direction. What did the force do?
What is Changed the direction of the ball's motion?
What is friction?
What is A force that occurs when surfaces rub against each other and can slow motion?
A student repeats a lab three times and gets similar results each time. Why is repeating an investigation useful?
What is It helps make the results more reliable?
A student pushes a toy car harder. How will the car's motion most likely change?
What is It will move faster or travel farther?
Two toy cars start at the same place. Car A travels 20 cm and Car B travels 50 cm. Which car traveled farther?
What is Car B?
A small push and a large push are applied to identical toy cars. Which car will most likely move farther?
What is The car receiving the larger force?
What is speed?
What is How fast an object moves?
A student says, "The harder I push an object, the farther it will always travel." Is this statement always true? Explain.
What is No. Other factors, such as friction and the surface, can affect motion?
A student pushes a box across the floor. The box eventually stops even though the student stops pushing. What force helps cause the box to slow down?
What is Friction?
A student rolls two identical balls. Ball A moves 2 meters in 4 seconds. Ball B moves 2 meters in 2 seconds. Which ball has greater speed?
What is Ball B?
A student rolls a ball across carpet and then across a smooth floor using the same force. The ball travels farther on the smooth floor. What explains this result?
What is The carpet produces more friction, which slows the ball down?
What is a contact force?
What is A force that occurs when two objects touch?
Challenge: Two students push identical toy cars with the same amount of force. One car travels farther. Give one possible reason for the difference.
What is The cars could be moving across different surfaces, creating different amounts of friction?