P8

Question 1

Displacement

Answer 1

Distance in a given direction

Question 2

Driving force

Answer 2

force of a vehicle that makes it move (sometimes referred to as motive force)

Question 3

Forces

Answer 3

a force (in newtons, N) can change the motion of an object

Question 4

Free-body force diagram

Answer 4

a diagram that shows the forces acting on an object without any other objects or forces shown

Question 5

Friction

Answer 5

the force opposing the relative motion of two solid surfaces in contact

Question 6

Magnitude

Answer 6

the size or amount of a physical quantity

Question 7

Newton’s first law of motion

Answer 7

if the resultant force on an object is zero, the object stays at rest if it is stationary, or it keeps moving with the same speed in the same direction

Question 8

Newton’s third law of motion

Answer 8

when two objects interact with each other, they exert equal and opposite forces on each other

Question 9

Parallelogram of forces

Answer 9

a geometrical method used to find the resultant of two forces that do not act along the same line

Question 10

Resultant force

Answer 10

a single force that has the same effect as all the forces acting on the object

Question 11

Scalar

Answer 11

a physical quantity, such as mass or energy, that has magnitude only (unlike a vector which has magnitude and direction)

Question 12

Vector

Answer 12

a vector is a physical quantity, such as displacement or velocity, that has a magnitude and a direction (unlike a scalar which has magnitude only)