Newton's Laws

Question 1

What is velocity?

Answer 1

Speed and direction

Question 2

What is acceleration? And examples?

Answer 2

A change in an objects velocity eg. a pen knocked of a desk, a car turning a corner at a constant 10km/h, and ice skater gliding in a straight line.

Question 3

What is inertia?

Answer 3

The tendency of objects to maintain their current state, either moving (in a straight line) or still.

Question 4

When is an object balanced?

Answer 4

When forces are at the same strength in opposite directions and when forces combined effect does not make the object accelerate.

Question 5

The amount of inertia and object has…..

Answer 5

increases with it’s mass

Question 6

Scientists track an object moving through space. At first (a) it is travelling at a constant velocity. Then (b) its changes direction. Then, (c) it straightens up again, but (d) increases speed before (e) slowing down again.

Which of the following must be true?

1. At (a) the object was subject to an unbalanced force
2. At (b) the object was subject to an unbalanced force
3. A force must have been applied at (c) to make the object

’

s path straighten up again
4. A force was required at (d) to make the object increase speed
5. At (e) the object decreased speed due to inertia

Answer 6

At (b) the object was subject to an unbalanced force. A force was required at (d) to make the object increase speed.

Question 7

What is a measurement of force, mass and acceleration?

Answer 7

Force= Newtons, Mass= Kg, Acceleration= m/s/s

Question 8

The speed of an object in a given direction is it’s:

Answer 8

Velocity

Question 9

What is Newton’s 2nd Law?

Answer 9

F=ma

Question 10

What is Newton’s 1st Law?

Answer 10

Anything at rest will stay at rest unless moved by an unbalanced force, and anything moving will stay moving.

Question 11

In physics, what is net force defined as?

Answer 11

The sum of all the different forces acting on the object

Question 12

Does the mass of an object make any different to how it accelerates?

Answer 12

Yes, more mass=less acceleration and less mass=more acceleration.

Question 13

What are some examples of contact forces?

Answer 13

Buoyancy, surface tension, air resistance, lift, thrust and friction.

Question 14

What are some examples of non-contact forces?

Answer 14

Weight, electrostatic force, magnetic force.

Question 15

What is the amount of gravity?

Answer 15

9.8 m/s/s

Question 16

How do you convert m/s/s to km/h?

Answer 16

times by 3.6 (opposite for km/h to m/s/s)

Question 17

What is Newton’s 3rd Law?

Answer 17

Each action has a reaction.

Question 18

What is a vector? Examples?

Answer 18

Direction and Magnitude eg. acceleration, force, velocity, displacement, weight.

Question 19

What is a scalar? Examples?

Answer 19

Magnitude eg. Distance, speed, direction, time, mass, temperature.

Question 20

Speed is equal to

Answer 20

Distance over time (Scalar)

Question 21

Velocity is equal to

Answer 21

Distance over time in a direction (Vector)

Question 22

Average speed is equal to

Answer 22

Total distance over time

Question 23

(PE) Potential Energy is equal to

Answer 23

(mgh)Mass x Gravity(9.8) x Height

Question 24

KE(Kinetic Energy) is equal to

Answer 24

(1/2mv^2) 1/2 x mass x velocity squared

Question 25

Work is equal to

Answer 25

(Fx) Force applied x distance shifted