Forces

Question 1

What is Newton’s first law?

Answer 1

An object will remain at rest or continue moving with a constant speed unless acted on by an unbalanced force

Question 2

What is Newton’s second law?

Answer 2

An object will accelerate (change speed) when acted on by an unbalanced force

Question 3

What is Newton’s third law?

Answer 3

To every action force there is an equal and opposite reaction force

Question 4

What is work done measured in?

Answer 4

Joules (J)

Question 5

What is power measured in?

Answer 5

Watts (W)

Question 6

What is power?

Answer 6

Work done every second

Question 7

What is weight?

Answer 7

Weight is the force due to gravity

Question 8

What is gravitational field strength measured in?

Answer 8

Newtons per kilogram (NKg-1)

Question 9

What is gravitational field strength measured in?

Answer 9

Newtons per kilogram (NKg-1)

Question 10

What is acceleration?

Answer 10

Acceleration is a measure of the increase in speed of a moving object in one second

Question 11

What is instantaneous speed?

Answer 11

Instanteneous speed is the speed of a moving object at any particular instant in time

Question 12

What is average speed?

Answer 12

Average speed is the total distance travelled divided by the total time taken

Question 13

What is friction?

Answer 13

Friction is a force that acts to resist movement

Question 14

What does the F stand for in the formula F = ma?

Answer 14

Unbalanced force on the object

Question 15

What is freefall?

Answer 15

If air resistance is ignored, all objects fall with the same acceleration (9.8ms-2) and would hit the ground at the same time regardless of their mass

Question 16

What is terminal velocity?

Answer 16

Once the upward force of air resistance on an object is large enough to balance the downward force of gravity, the object is said to have reached a terminal velocity