Fprces

Question 1

What are forces

Answer 1

A force can be a push or pull on an object caused by an interaction with another object. Forces are vector quantities

Question 2

What is the difference between scalar and vector

Answer 2

Scalar - quantities only have a magnitude - distance and speed

Vector - quantities have a magnitude and a direction eg velocity and displacement

Question 3

Contact forces

Answer 3

Occurs when two objects are touching each other
Involves - friction, air resistance, tension and normal contact force

Question 4

Non contact forces

Answer 4

Act at a distance not touching
Eg - gravitational force, electrostatic force, and magnetic force

Question 5

Resultant force

Answer 5

If two or more forces act on an object along the same line, their effect is the same as if they were replaced with a single resultant force.
Sum of the magnitudes of the forces in same direction
Difference between magnitudes if forces is opposite directions

Question 6

Newton’s first law

Answer 6

Velocity, speed, and or direction of an object will only change if a resultant force is acting on it.

Of the resultant forces of stationary item - 0 object will remain stationary
If resultant force of moving object - 0 it will continue moving at the same velocity in starlight lime

Question 7

Newton’s second law

Answer 7

The acceleration of an object is proportional to the resultant force acting on the object and inversely proportional to the mass of the object. F =ma

Question 8

Speed

Answer 8

Average speed - total distance travelled/total time taken

Question 9

Velocity

Answer 9

Velocity of an object is its speed in a given direction

An objects velocity changes if its direction changes, even if its speed is constant

Question 10

Acceleration

Answer 10

The change in velocity of an object per second. Vector.

Object is accelerating if its speed or direction are changing. Change in velocity/time taken - Am/s