Forces and Shape

Question 1

Some examples of Forces

Answer 1

1. Thrust
2. Air Resistance
3. Weight
4. Compression
5. Upthrust
6. Reaction Force (force due to contact between 2 objects Ex: Normal Reaction Force)

Question 2

What are the effects of forces between bodies

Answer 2

1. Forces are able to change the direction of a moving body or object
2. Forces are able to change the shape of a moving object or body.
3. Forces are also able to change the speed of a moving object or body.

Question 3

Difference between Vector and Scalar Quantities

Answer 3

Scalar Quantities only have a magnitude (a number describing how big they are)

Vector Quantities have a magnitude as well as a direction.

Question 4

What type of quantity is force and explain why

Answer 4

Force is a vector quantity because it has a magnitude measured in Newton (N) and also a particular direction that the force might act on.

Question 5

What is resultant force

Answer 5

This is the overall force acting on the object. If the resultant force is 0N, then the object will not move.

Question 6

What is Friction

Answer 6

Friction is a force that opposes the motion of a moving object because it acts on the opposing direction to the direction in which the object is moving.

Question 7

Some other name for resultant Force

Answer 7

Net force

Unbalanced force

Question 8

What is the stopping distance

Answer 8

This is the sum of the Thinking Distance and the Braking Distance.

Question 9

What is thinking distance

Answer 9

This is the distance in which the vehicle travels in the time it takes the driver to react to the situation

Question 10

What is the Braking Distance

Answer 10

This is the distance that the vehicle travels while the vehicle is braking.

Question 11

What factors affect the thinking Distance

Answer 11

1. Intoxication. ex: alcohol
2. Tiredness
3. Distractions

Question 12

What factors affect the braking distance

Answer 12

1. Road Condition
2. Vehicle Mass
3. The condition of the vehicles. ex: wear an tear on the brakes.

Question 13

Describe the Forces acting on a skydiver when falling down

Answer 13

1. When the skydiver begins his fall, the weight of the skydiver is greater than the air resistance and he accelerates to the ground due to an unbalanced force.
2. As the skydiver accelerates the air resistance acting against the skydiver also increases and eventually becomes equal to the weight, making the skydiver reach terminal velocity
3. Then after the skydiver opens the parachute, the air resistance rapidly increases and the skydiver is immediately slowed down.