Revision

Question 1

What is a force, what is it measured in?

Answer 1

A force is a push,. pull or a twist its measured in Newtons

Question 2

What are 4 ways a force can affect an object

Answer 2

Accelerate, decelerate, change direction, change shape

Question 3

Contact forces

Answer 3

Air resistance, buoyancy, tension

Question 4

Non-contact forces

Answer 4

Gravity, weight, electrical, magnetic

Question 5

If the applied force is greater than the air resistance what is the object doing?

Answer 5

Speeding up

Question 6

If the air resistance is greater than the applied what is the object doing?

Answer 6

slowing down

Question 7

If the air resistance and applied force is equal what is the object doing

Answer 7

Going at a constant speed

Question 8

If there is no air resistance or applied force what is the object doing?

Answer 8

It is stationary

Question 9

How do you convert km/h to m/s

Answer 9

divide by 3.6

Question 10

What is mass and what is it measured in?

Answer 10

Mass is the amount of matter that makes up an object , it is measured in KG

Question 11

What is weight and what is it measured in?

Answer 11

Weight is the gravitational force acting on an object it is measured in Newtons

Question 12

What is gravity>

Answer 12

The rate of acceleration at which an object falls=9.8m/s2

Question 13

What are the two factors that determine the strength of the gravitational pull?

Answer 13

1. Mass of the planet

2. Distance you are from the centre of the Earth

Question 14

What is instantaneous speed?

Answer 14

Speed of an object in a particular moment eg: speedometer in a car

Question 15

What is inertia?

Answer 15

Resistance an object has to a change in its state of motion

Question 16

Scalar

Answer 16

How far something travels (Magnitude)

Question 17

Vector

Answer 17

How far somethings travels and the direction

Question 18

What is displacement?

Answer 18

Measures the shortest distance to a location

Question 19

What is work measured in?

Answer 19

Joules

Question 20

Why don’t you fall through the floor?

Answer 20

Because the floor provides an upward push against the force of gravity. These two forces are balanced

Question 21

Newtons law of energy

Answer 21

Energy cannot be created nor destroyed only transformed

Question 22

Define Kinetic energy

Answer 22

The energy an object possesses due to its motion eg: rollercoaster

Question 23

Define Potential Energy

Answer 23

The energy stored in an object due to its position

Question 24

Define contact forces

Answer 24

A contact force is any force that requires contact to occur.

Question 25

initial speed=

Answer 25

final speed-(AxT)

Question 26

Define non-contact forces

Answer 26

A non-contact force is a force which acts on an object without coming physically in contact with it.

Question 27

A table tennis ball launcher is fired. Compared to the force on the ball, the force on the launcher is

Answer 27

the same

Question 28

what forces are acting on a ballon as its released

Answer 28

every action has an equal and opposite reaction. Therefore, as the gas is released from the balloon, it pushes against the outside air, and the outside air pushes back.