Motion

Question 1

What is the formula for speed?

Answer 1

S= d/t

Question 2

What is the formula for velocity?

Answer 2

Distance moved in a stated direction (change in position)/ change in time

Question 3

What is the formula for acceleration?

Answer 3

v-u/ change in time

Question 4

What is acceleration?

Answer 4

The rate of change of velocity with time

Question 5

What quantities does velocity have?

Answer 5

Both magnitude AND direction

Question 6

What is acceleration caused by?

Answer 6

Caused by changing of magnitude and direction of velocity
By changing in direction of velocity
Changing in speed

Question 7

What can acceleration be?

Answer 7

Speeding up or slowing down

Question 8

What is negative acceleration called?

Answer 8

Retardation

Question 9

In a velocity-time graph what does the slope represent?

Answer 9

Acceleration

Question 10

In a velocity-time graph what does the area under the graph represent?

Answer 10

Displacement

Question 11

In a velocity-time graph what does the straight line imply?

Answer 11

Uniform acceleration

Question 12

In a velocity-time graph what do curved lines imply?

Answer 12

Non-uniform acceleration

Question 13

In a velocity-time graph what does the gradient represent?

Answer 13

The steeper the gradient the higher the acceleration

Question 14

In a distance- time graph what does the slope of the straight line indicate?

Answer 14

The average velocity

Question 15

In a distance- time graph what does the straight line imply?

Answer 15

Constant velocity

Question 16

In a distance- time graph what do curved line imply?

Answer 16

Acceleration

Question 17

In a distance- time graph what does the positive slope imply?

Answer 17

Motion in the positive direction

Question 18

In a distance- time graph what does the negative slope imply?

Answer 18

Motion in the negative direction

Question 19

In a distance- time graph what does zero slope imply?

Answer 19

A state of rest

Question 20

What is the acceleration of free fall on Earth?

Answer 20

10m/s^2

Question 21

Describe a parachutist jumping from an aeroplane BEFORE he opens the parachute

Answer 21

1. Initially his speed is low
2. The air resistance is negligible and he is influenced by his weight only
3. He is speeding up at the rate of gravitational acceleration
4. As the speed increases air resistance increases
5. The acceleration will decrease as resultant force decreases. Until the acceleration becomes zero and the resultant force becomes zero weight=air resistance
6. He has reached terminal velocity

Question 22

Describe a parachutist jumping from an aeroplane WHEN he opens the parachute

Answer 22

1. Parachute is opened when there is dynamic equilibrium
2. Air resistance becomes much greater than the force of gravity
3. The net force up while he is moving down
4. He will slow down rapidly and therefore air resistance decreases
5. Resultant force decreases
6. Weight= air resistance - Terminal velocity