Answer the following.
1. Give an example of one contact force. 2. What is the SI unit of force?
3. What is a spring balance used for?
4. Give an example of one non-contact force.
5. Give two advantages of friction.
Answers
Explanation:
A contact force is any force that requires contact to occur.[1] Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter. Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work. In the first case the force is continuously applied by the person on the car, while in the second case the force is delivered in a short impulse. Contact forces are often decomposed into orthogonal components, one perpendicular to the surface(s) in contact called the normal force, and one parallel to the surface(s) in contact, called the friction force.[1]
Answer:
1) example of one contact force -Gravitational force
2) Newton (N)
3) Spring balance is it used for measure mass
4) example of one non-contact force- Magnetic force
5) it help us to move on the ground
brakes in a car use friction to stop the car