Forces

Question 1

Velocity is speed in a given

Answer 1

Direction

Question 2

When two objects interact. They exert ______ and _______ forces on each other.

Answer 2

Equal and opposite

Question 3

Acceleration (m/s^2) =

Answer 3

Time taken (seconds)

Question 4

A moving object acted on by a resultant force: In the same direction as the direction of its motion, does what?

Answer 4

Accelerates

Question 5

Weight (N) =

Answer 5

Weight (N)= mass (kg) x gravitation field strength (M/kg)

Question 6

The slope of a distance time graph represents

Answer 6

The speed

Question 7

_____ distance = thinking distance + braking distance

Answer 7

Stopping

Question 8

Three factors affecting thinking distance

Answer 8

Tiredness, drugs, alcohol, distractions

Question 9

Speed (m/s)=

Answer 9

Speed (m/s) = distance travelled (m)
—————————-
Time taken (s)

Question 10

Force=

Answer 10

Force= mass (kg) x acceleration (m/s^2)

Question 11

A moving object acted on by a resultant force: in the opposite direction as the direction of its motion, does what?

Answer 11

Decelerates

Question 12

The value of the Earth’s gravitational field strength at its surface is about…

Answer 12

10N/kg

Question 13

The steeper the slope in a distance time graph, the greater the _______ it represents.

Answer 13

Speed

Question 14

Braking distance is the distance the vehicle travels

Answer 14

Under the braking force

Question 15

Thinking distance is the distance travelled by the the vehicle in the time it takes…

Answer 15

For the driver to react

Question 16

Acceleration is a change of ______ per second

Answer 16

Speed

Question 17

The unit of force is the ____ (____)

Answer 17

Newton, N

Question 18

Three factors affecting braking distance:

Answer 18

Poorly maintained brakes and tyre, road and weather conditions

Question 19

Kinetic energy =

Answer 19

Kinetic energy (J) = mass (kg) x velocity^2 (m/s)^2
—————————————-
2

Question 20

If the orbital radius for the Earth is 1.5 x 10^11m, what is its orbital speed?

Answer 20

9.42 x10^11m per year or 29,850.18 m/s

Question 21

What force allows comets and planets to orbit the sun?

Answer 21

Gravitational force

Question 22

A force of 100N acts on an object for 4 seconds. What is the momentum change of the object?

Answer 22

400 Ns

Question 23

Vectors have size and _____.

Answer 23

Direction

Question 24

Moment =

Answer 24

Moment = perpendicular force x distance

Question 25

What is a comet made from?

Answer 25

Dust and ice

Question 26

Elastic potential energy can be stored when as an object is _____ or ____.

Answer 26

Stretched or squashed

Question 27

Change in momentum (kg m/s) =

Answer 27

Change in momentum (kg m/s) = force (N) x time (s)

Question 28

What is a galaxy?

Answer 28

A collection of billions of stars

Question 29

An object falling in air resistance reaches a ____ ____

Answer 29

Terminal velocity

Question 30

A 40kg woman is running at 8m/s. What is her momentum?

Answer 30

320kg m/s

Question 31

Gravitational field strength, g, is smaller on which astronomical object?

Answer 31

The moon, Pluto, mercury etc

Question 32

What is true about interaction pairs if forces?

Answer 32

Always equal in size, opposite in direction, act on different ovjects

Question 33

The kinetic energy of a moving object depends on its ____ and ____

Answer 33

Mass and speed

Question 34

Orbital speed=

Answer 34

Orbital speed= 2 x pi x r ------------- T

Question 35

Give three examples of orbiting objects.

Answer 35

Comets, planets, the moon, artificial satellites

Question 36

Calculate the momentum of a lorry of a mass 5000kg travelling at 2m/s

Answer 36

10000kg m/s

Question 37

Gravity causes ______ to orbit the sun; moons and _____ to orbit the Earth, and comets to orbit the____.

Answer 37

Planets Satellites Sun

Question 38

Work done (J) =

Answer 38

Work done (J) = force (N) x distance (m)

Question 39

The more time an impact takes, the _____ force exerted per second.

Answer 39

Less

Question 40

What is the universe?

Answer 40

A large collection of billions of stars

Question 41

If car has travelled 3000m in 100 minutes what is its speed in m/min and m/s?

Answer 41

30 m/min | 0.5 m/s

Question 42

A parachutist has a weight of 800N. He is falling at a steady speed. What is the resultant force acting on him?

Answer 42

0 Newtons

Question 43

An object falling freely accelerates at

Answer 43

10m/s^2 or g

Question 44

Give three examples of vector quantities in physics

Answer 44

Velocity, time, force, momentum

Question 45

Gravitational field strength, g, is larger on which planet?

Answer 45

Jupiter, Saturn etc

Question 46

What is the equation to calculate speed?

Answer 46

Speed =distance/ time

Question 47

Momentum=

Answer 47

Momentum (kg m/s) = mass (kg) x velocity (m/s)

Question 48

How does extension vary with applied force for springs?

Answer 48

Proportionally, up to the elastic limit

Question 49

The _________ system is part of the _______ galaxy, which is a collection of billions of ________. The _______ is a collection of billions of _____.

Answer 49

``` Solar Milky Way Stars Universe Galaxies ```

Question 50

A heavy box is standing on the floor. What is the name of the force holding it up?

Answer 50

Normal contact reaction force