Dynamics

Question 0

What can a resultant force cause?

Answer 0

1. Stationary object to move.

2. Moving object to stop, move faster, slow down, change direction.

Question 1

What does no resultant force mean?

Answer 1

No resultant force doesn’t mean that there are no forces acting on the body. It means that all forces are balanced.

Question 2

What is Newton’s second law?

Answer 2

Resultant force acting upon object is equal to product of mass and acceleration of the object; the direction of force is same as that of the object’s acceleration.

Question 3

How do we find force?

Answer 3

Mass times acceleration.

Question 4

What is the SI unit for force?

Answer 4

newton(N)

Question 5

What is Newton’s third law of motion?

Answer 5

For every action, there is an equal and opposite reaction.

Question 6

What is friction?

Answer 6

Forces that opposes motion between 2 surfaces in contact.

Question 7

What does friction not depend on?

Answer 7

Area of contact of the surfaces.

Question 8

What does the size of the frictional force depend on?

Answer 8

1. Material in contact.
2. Nature of surfaces in contact; the rougher the surface the greater the friction.
3. Proportional to force pressing surfaces together. (Or weight)

Question 10

What are the effects of balanced forces on a body?

Answer 10

1. Body remains stationary.

2. Body moves with constant velocity.

Question 11

How do we know when the body has balanced forces acting on it?

Answer 11

When resultant force is 0.

Question 12

How do we know if forces acting on a body are unbalanced?

Answer 12

When resultant force is not 0.

Question 13

What is friction independent of?

Answer 13

1. Area of contact between surfaces.

2. Relative velocity between the 2 surfaces.

Question 14

What is friction needed for?

Answer 14

1. Prevent motion

2. Produce motion.

Question 15

What are some methods of reducing friction?

Answer 15

1. Lubricate surfaces in contact with oil or grease.
2. Use ball bearings or rollers.
3. Separate surfaces with cushion of air.

Question 24

What is a force?

Answer 24

A push or a pull.

Question 25

What are some effects of balanced forces acting on an object?

Answer 25

1. Body remains stationary.

2. Body moves with constant velocity.

Question 26

How do we know when the forces acting on a body are balanced?

Answer 26

When resultant force is 0.

Question 27

How do we know when the forces acting on a body are not balanced.

Answer 27

When resultant force is not 0.

Question 28

What is friction need for?

Answer 28

1. Prevent motion.

2. Produce motion.

Question 29

What are some methods to reduce friction?

Answer 29

1. Lubricate surfaces in contact with oil or grease.
2. Use ball bearings or rollers.
3. Separate surfaces with a cushion of air.