Force and motion unit test

Question

science 7b answers

Answer 1

1. What is force?
- Force is a push or pull exerted on an object.

2. What is motion?
- Motion is the change in position of an object over time.

3. What is the difference between speed and velocity?
- Speed is the distance an object travels in a certain amount of time, while velocity is the speed of an object in a specific direction.

4. What is inertia?
- Inertia is the tendency of an object to resist changes in its motion.

5. What is the relationship between force and motion?
- Force causes an object to accelerate or decelerate, resulting in changes in its motion.

6. Explain Newton's first law of motion.
- Newton's first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by an external force.

7. What is friction?
- Friction is the force that opposes the motion of objects that touch as they move past each other.

8. Describe the forces acting on a book resting on a table.
- The forces acting on a book resting on a table are gravity pulling the book downward and the normal force of the table pushing up on the book.

9. How does mass affect an object's inertia?
- The greater the mass of an object, the greater its inertia. Objects with more mass require more force to change their motion.

10. How does force affect motion?
- Force causes acceleration or deceleration of an object, changing its speed, direction, or both.