Objects can interact in many ways. Write down one type of non-contact force that occurs when two objects interact.
A box rests on a horizontal floor. Draw a free-body force diagram to show the forces acting on the box. Use arrows to represent the forces.
An ice hockey puck is at rest on horizontal, frictionless ice. A player gives the puck a brief push to start it sliding.
Explain the motion of the puck during and after the push.
A sports trainer comments:
"An athlete with less body mass can achieve a higher acceleration than a heavier athlete when both exert the same leg force against the ground."
Explain why the trainer is correct.
A runner accelerates from 2 m/s to 14 m/s in 3 seconds3\text{ seconds}3 seconds.
Calculate the acceleration of the runner.
Use the equation: Acceleration=Change in speed÷Time taken\text{Acceleration} = \text{Change in speed} \div \text{Time taken}Acceleration=Change in speed÷Time taken