Newtons Laws

Question 1

What is mass?

Answer 1

The amount of matter in an object. measured in kg

Question 2

what is weight?

Answer 2

weight is the force of gravity on your mass. measured in newtons (N)

Question 3

what equation is used to find weight (N)

Answer 3

Weight (N) = mass (kg) x gravitational field strength (N/kg)

Question 4

what is the gravitational field strength on Earth?

Answer 4

10N

Question 5

how much will 5kg of mass weigh on Earth

Answer 5

5 x 10 = 50N

Question 6

When are you weightless?

Answer 6

When gravitational field strength becomes 0N/kg you become weightless.

Question 7

what is inertia?

Answer 7

inertia is a resistance to a change in motion

Question 8

How does mass effect inertia?

Answer 8

More mass means more inertia. Something with a higher inertia needs more force to be moved than something with less.

Question 9

What is newtons first law?

Answer 9

A body will continue in its state of rest or uniformed motion, in a straight line unless a net or resultant force acts upon it.

Question 10

What does newtons first law mean?

Answer 10

That balanced forces will have no effect on the motion of an object. it could be still, moving at constant velocity or floating.

Question 11

What is newtons second law?

Answer 11

Resultant force (N) = mass (kg) x acceleration (m/s^2)

Question 12

what does newtons second law mean?

Answer 12

when the forces acting on an object are unbalanced the resultant force will cause the object to accelerate in the direction of the resultant force.
Unbalanced force will cause:
acceleration, deceleration, change in direction

Question 13

A car weighs 1,000kg. The resultant force is 5,000N. find the acceleration of the car

Answer 13

a=5000/1000 = 5m/s^2

Question 14

acceleration and mass are inversely proportional. what does this mean?

Answer 14

if the mass doubles, the acceleration halves given the resultant force doesn’t change.

Question 15

Resultant force and acceleration are directly proportional. what is meant by this?

Answer 15

If the resultant force doubles, the acceleration also doubles given that the mass stays the same.

Question 16

A car has a mass of 1,200 kg, and an engine that can deliver a force of 6,000 N. Find the acceleration of the car.

Answer 16

a = F ÷ m

= 6,000 N ÷ 1,200 kg

= 5 m/s2

Question 17

what is terminal velocity?

Answer 17

The maximum speed of an object, reached when the forces moving the object are balanced by its frictional forces.

Question 18

When a skydiver moves through the air, what stays constant?

Answer 18

Weight, the drag changes with the speed of the skydiver.

Question 19

What does the area under a time-velocity graph represent?

Answer 19

the distance travelled

Question 20

What is newtons third law?

Answer 20

If a body A exerts a force on body B then body B exerts an equal and opposite force on body A.

Question 21

Give an example of newtons third law

Answer 21

if car A crashes into car B with a force of 10,000 N, then car B exerts a force of –10,000 N back on car A.

Question 22

what is drag?

Answer 22

a friction force that opposes the motion of an object in air or water. usually this is air resistance.

Question 23

what is gravity?

Answer 23

the force of attraction between all objects