Forces And Spped

Question 1

Drag

Answer 1

A force that resists movement to slows down a moving object.

Question 2

Streamlining

Answer 2

Where the shape of an object causes little resistance in air or in water.

Example: a cyclist sitting straight up isn’t streamlined but one who has leaned down into the bike towards the handlebars is streamlined)

Question 3

Thrust

Answer 3

The force which makes an object move (like an engine for a plane as an example!)

Thrust is often generated by an engine, for example in a car, rocket or aeroplane.

Question 4

Anomalous result

Answer 4

An unusual result which is hard to explain.

A measurement which is very different from other measurements taken in the same situation, so it seems unusual and hard to explain. Anomalous results are usually ignored in an investigation (ie not included when calculating a mean average) or repeated to check them.
and calculate a mean.

Question 5

Control variable

Answer 5

The control variables are things which must be kept the same in an experiment.

Question 6

Independent variable

Answer 6

The factor which is deliberately changed in an investigation, to find out how it affects the dependent variable.

Question 7

Friction

Answer 7

A force which acts against the movement of an object.

Two objects rubbing together cause friction

Question 8

Lubrication

Answer 8

Applying a slippery substance to two surfaces to reduce friction. Oil is a common lubricant which is applied to moving parts in machines, like the chain and gears on a bike.

Question 9

Disipitated

Answer 9

When energy spreads out into the surroundings and becomes less useful.

Question 10

Frictional forces

Answer 10

Forces which resist an object moving.

Question 11

Weight

Answer 11

A force that acts on mass, pulling it down, due to gravity. Weight is a force and forces are measured in newtons (N).

Question 12

Mass

Answer 12

A measure of the amount of matter an object is made out of. Mass is measured in kilograms (kg).

Question 13

Matter

Answer 13

Any substance that has mass and takes up space by having volume. Matter can be solid, liquid or gas.

Question 14

Gravitational field strength

Answer 14

The force that attracts one kilogram towards another massive object, like a planet. Gravitational field strength has the symbol g and it is measured in newtons per kilogram (N/kg).

Question 15

Calculating weight and mass

Answer 15

The following equation can be used to calculate the weight of an object:
Weight = mass x gravitational field strength

Question 16

Calculation motion and speed

Answer 16

Calculate speed using the speed equation - speed = distance divided by time.

Question 17

Speed

Answer 17

A measure of how fast an object is moving.

Question 18

Distance

Answer 18

Numerical description of how far apart two things are. Measured in metres.

Question 19

Time

Answer 19

How long an event lasts, measured in seconds.

Question 20

Speed equation is

Answer 20

Speed = distance divided by time

Question 21

Distance equation

Answer 21

Distance = speed x time

Question 22

Time equation

Answer 22

Time = distance divided by speed

Question 23

Resultant force

Answer 23

The overall force acting on an object

Question 24

Balanced forces

Answer 24

If the forces acting on the object are balanced there is no resultant force. This means the object could be travelling at a constant velocity. It could also be stationary or not moving at all.

Question 25

Air resistance

Answer 25

A force that acts on an object which is moving through air. Air resistance acts in the opposite direction to the direction of movement, so it acts to slow down the moving object.

Question 26

Normal reaction force

Answer 26

When an object is at rest on a surface it experiences a supportive force that acts against the weight of the object. This force acts at a right angle to the surface.

Question 27

At rest

Answer 27

When an object is at rest it is not moving.

Question 28

Weight

Answer 28

This is the force that acts on an object that is within a gravitational field.

Question 29

Forces key points

Answer 29

Forces

• A force is a push or a pull that acts on an object due to the interaction with another object.
• Force is measured in newtons (N).
• Forces are divided into contact forces and non-contact forces.

Question 30

Contact force

Answer 30

A force that act between two objects that are physically touching.

Question 31

Non contact force

Answer 31

A force that acts between two objects that are not physically touching.

Question 32

Magnitude

Answer 32

The size of a physical quantity.

Question 33

Tension

Answer 33

Tension is a pulling force exerted on an object by a string, rope or rod

Question 34

Friction

Answer 34

When two objects slide past each other they experience friction.
Friction is a force that acts between two touching surfaces and prevents or resists them moving against each other.

Question 35

Upthrust

Answer 35

Upthrust is an upwards force that acts on an object when it is in a fluid (a liquid or gas).

Question 36

Thrust

Answer 36

Thrust is a driving force exerted by an engine to make an object move.

Question 37

Normal reaction force

Answer 37

When an object pushes on a surface like a table, wall or the ground, the surface pushes back on the object with a balancing force.
The normal reaction force always acts at right angles to the surface.

Question 38

What was god’s promise to the Jews

Answer 38

That he would offer protection and land to Abraham and his descendants