A force is a push or a pull.
A force can:
— start motion
— stop motion
— speed up motion
— slow down motion
— change the direction of motion
— change the shape of an object
— have no visible effect
1. What happens
a. when a tennis ball is hit with a racquet
b. when the heart beats
c. when you write on paper with a pencil
d. when you stretch a rubber band
e. when you drop a tennis ball
f. when a plastic ruler that is rubbed with a wool cloth is brought close to a thin stream of tap water
2. Write the names of three non-contact forces.
3. Most of the time there is more than one force acting on an object. True or False.
4. What are the different forces acting on a coin that is sliding/rolling on the surface of a table? Draw a diagram to show the direction of forces using arrows.
5. Why doesn’t gravity make you fall through the floor?