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Science test
Use for study
| Question | Answer |
|---|---|
| What does Newton's First Law state? | Newton's First Law states that an object at rest remains at rest, and an object in motion continues in motion with the same speed and in the same direction unless acted upon by a net external force. |
| How does friction play a role in the First Law? | Friction is a force that opposes the motion of an object. If no external force (like friction) acts on an object in motion, it would continue to move indefinitely. |
| What is the formula for Newton's Second Law? | The formula is given by F = m a F=ma, where F F is the net force applied to an object, m m is its mass, and a a is the acceleration produced. |
| How would you calculate the force needed to accelerate a 10 kg object at 2 , m/s 2 2,m/s 2 ? | Using F = m a F=ma, F = 10 , kg × 2 , m/s 2 = 20 , N F=10,kg×2,m/s 2 =20,N So, you would need a force of 20 , N 20,N. |
| What does Newton's Third Law state? | Newton's Third Law states that for every action, there is an equal and opposite reaction. This means that forces always occur in pairs. |
| Can you give an example of the Third Law in action? | When you jump off a small boat, you push down on the boat (action), and the boat pushes you up into the air (reaction). As a result, the boat may move backward. |
| What is momentum, and how is it calculated? | Momentum ( p p) is a measure of motion and is calculated using the formula p = m v p=mv, where m m is the mass of an object and v v is its velocity. |
| If a 5 kg object is moving at a velocity of 3 , m/s 3,m/s, what is its momentum? | Using p = m v p=mv, p = 5 , kg × 3 , m/s = 15 , kg m/s p=5,kg×3,m/s=15,kg m/s So, the momentum of the object is 15 , kg m/s 15,kg m/s. Friction |
| What is friction and how does it affect motion? | Friction is a force that opposes the relative motion between two surfaces in contact. It can slow down or stop the motion of objects. |
| What are the two main types of friction? | The two main types of friction are: Static friction: The force that prevents two surfaces from sliding past each other. Kinetic (or dynamic) friction: The force that acts between moving surfaces. |
| What is a force ? | A force is any push or pull on an object by another object |
| Non- Contact ? | Forces exerted without direct contact between object's |
| Contact ? | Forces exerted when two objects have direct contact |
| Properties ? | Any observational trait Contact force |
| Gravity ? | Gravity is a attractive force between all object's that have mass Non- Contact force |
| Friction ? | Friction is a force that opposites the movement between 2 touching surfaces. Contact force |
| Types of friction? | Rolling , Sliding , Static , Fluid |
| How is gravity measured on earth? | Newtons |
| What is a net force ? | Net force is a sum of all forces acting on something |
| Newtons first law states ? | Any object at rest stays at rest unless acted upon it and Any object in motion stays in motion unless acted upon it |
| What is motion ? | Motion is the change in the position of an object Measure it in Newtons |
| What is distance ? | Distance is how far an object travels Meters |
| What is displacement ? | The distance moved away from where the object started Meters |
| Speed ? | Speed is the measure of the distance an object travels in a unit of time. |
| Velocity ? | Velocity is the speed and direction of a moving object |
| Acceleration ? | Acceleration is the rate at which an object changes velocity Can be Positive and negative |
| Acceleration changes as a result of velocity this means ? | Changes when velocity and or speed change. |
| How would you describe newtons 3rd law ? | Anything that has a action has a equal and opposite reaction |
| What are the 2 types of forces described by 3rd law? | Action and Reaction |
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