Forces and Motion

Question 1

Vector Quantity?

Answer 1

quantity that has magnitude (size) and direction
- e.g. velocity

Question 2

Scalar Quantity?

Answer 2

Quantity that has magnitude (size) only
- e.g. speed

Question 3

Newton’s first law?

Answer 3

If resultant force acting on an object is 0 than:
- if stationary, will remain stationary
- if moving, will remain moving at constant speed in a straight line

Question 4

Contact forces?

Answer 4

• friction
• air resistance
• tension
• normal contact

Question 5

Non- contact forces?

Answer 5

• gravitational force
• electrostatic force
• magnetic force

Question 6

Weight equation?

Answer 6

Weight= mass x gravitational field strength

Question 7

Acceleration equation?

Answer 7

acceleration= change in velocity / time taken

Question 8

Resultant force equation?

Answer 8

resultant force= mass x acceleration

Question 9

Newton’s second law?

Answer 9

acceleration directly proportional to net force and inversely proportional to its mass.

Force= mass x acceleration

Question 10

Newton’s third law?

Answer 10

every action has an equal and opposite reaction.
F1= F2

Question 11

Force applied to spring equation?

Answer 11

force applied to spring= spring constant x extension

Question 12

When may braking distance increase?

Answer 12

• road is wet or icy
• car has poor brakes or bald tyres
• speed of the car is greater