Different Kinds of Forces

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Presentation transcript:

Different Kinds of Forces Objective: To observe and identify different kinds of forces at work.

Research Force: a push or pull. Contact forces: when the agent has contact with the receiver. Examples: friction, elastic, muscular, buoyancy Non-contact forces: when the agent does not contact the receiver. Examples: magnetism, electric/static, gravity

Think How would you get a toy boat to move in a bathtub? Name three ways. 1) push with hand – contact 2) splash waves – contact 3) blow on it - contact

Procedure In each of the following activities: 2:30 per station Procedure In each of the following activities: 1. Identify the agent (A), the receiver (R), and the effect (E) of each force, 2. State weather the force is a contact or non-contact force. 3. Name the force ( muscular, buoyancy, elastic, friction, magnetism, electric/static, or gravity) In many cases, more than one force is at work!

Activity One Push the empty beaker bottom first into the water in the sink. A= R= E= Contact or non-contact? Names of forces: Submerge the beaker, let it fill up with water, then lift it out of the sink. A= R= E= Contact or non-contact? Names of forces?

Activity Two Place the paper clips under the beaker. Use the magnet to try and lift the paper clips to the top of the beaker. A= R= E= Contact or non-contact? Name of force?

Activity Three With one hand, hold up two plastic strips and let them hang. Observe what happens. Rub both strips with the wool. Lift them again and observe the forces. A= R= E= Contact or non-contact? Name of Force?

Activity Four Drop a flat piece of paper and a crumpled piece of paper at the same time and from the same height. A= R= E= Contact or non-contact? Names of forces?

Activity Five Hang the mass on the thinner rubber band. Hang the mass on the thicker rubber band. A= R= E= Contact or non-contact? Names of forces?

Activity Six Pull on the rubber band attached to the book. How long must the band stretch before the book starts moving? ____ cm. Add another book: _____cm. Place the straws under the book and repeat: ____ cm. What has changed? A= R= E= Contact or non-contact? Names of forces?

Activity Seven Make a ramp with a board and a book. Roll the can down the ramp and measure how far it rolls from the end of the ramp. ____ cm. Place a towel at the end of the ramp and repeat. ____ cm. A= R= E= Contact or non-contact? Name of Force?

Conclusions Use this list of words to identify the forces at work in each of the activities for question #1. magnetism; muscular; gravity; friction; buoyancy; elastic; electrical.