Dynamics

Question 1

Newton’s first law:

Answer 1

An object will remain at rest or in a state of uniform motion unless it is acted on by a resultant force.

Question 2

Weight is…

Answer 2

the pull of Earth’s gravity.

Question 3

Freefall on the moon is…

Answer 3

1.6 ms-2

Question 4

Interia is…

Answer 4

the tendency of a moving object to carry on moving.

Question 5

For a body of constant mass its…

Answer 5

acceleration is directly proportional to the resultant force applied to it.

Question 6

Force is the rate of change of…

Answer 6

momentum.

Question 7

The magnitude of the drag force depends on:

Answer 7

• the shape of the object
• the speed of the object
• the viscosity of the fluid

Question 8

Terminal velocity is reached when…

Answer 8

air resistance is equal to the weight of the body.

Question 9

Forces on the inclined plate-the parallel component:

Answer 9

mgsin(x)

Question 10

Forces on the inclined plate-the perpendicular component:

Answer 10

mgcos(x)

Question 11

Newton’s third law:

Answer 11

When two bodies interact, the force they exert on each other is equal in magnitude and opposite in direction. Forces are the same.