Physics (Forces and motion)

Question 1

Resultant force-

Answer 1

The total force that results from two or more forces acting upon a single object. It is found by adding together the forces, taking into account their directions. Another term for net force.

Question 2

Newton’s first law-

Answer 2

1. A moving object will continue to move at the same speed and direction unless an external force acts on it.
2. A stationary object will remain at rest unless an external force acts on it.

Question 3

Resultant force (n) = mass (kg) x acceleration (m/s2)

Answer 3

F= m x a

Question 4

Centripetal force-

Answer 4

The resultant force that causes the change is direction

Question 5

Weight depends on Mass and gravitational field strength

Answer 5

Weight (N) = Mass (kg) x gravitational field strength (n/kg)

Question 6

Mass-

Answer 6

The quantity of matter there is in an object.

Question 7

Weight-

Answer 7

A measure of the pull of gravity on an object.

Question 8

Newton’s second law-

Answer 8

1. The size of the force (for the same mass, the bigger the force the bigger the acceleration.
2. The mass of the object (for the same force, the more massive the object the smaller the acceleration.)

Question 9

Inertial mass-

Answer 9

1. Measure how difficult it is to change the velocity of an object.
2. The force on it divided by the acceleration that force produces.

Question 10

Newton’s third law-

Answer 10

1. When objects touch, such as when you sit on a chair

2. When distance, such as the gravitational attraction between the earth and the moon.

Question 11

Equilibrium-

Answer 11

When a situation is not changing because all the things affecting it balance out.

Question 12

Momentum-

Answer 12

A measure of the tendency of an object to keep moving- or how hard it is to stop it moving.

Question 13

Momentum equation=

Answer 13

Momentum= mass c velocity

Question 14

Force=

Answer 14

Mass x change in velocity divided by time

Change in momentum divided by time

Question 15

Conservation of momentum-

Answer 15

The total momentum before an event is the same as after the event.

Question 16

Stopping distance=

Answer 16

The distance a vehicle has covered between the driver first spotting a hazard and the vehicle coming to a stop.

Question 17

Thinking distance=

Answer 17

Distance the car travels in the drivers reaction time.(The time between noticing the hazard and applying the brakes).

Question 18

Braking distance=

Answer 18

Distance taken to stop once brakes have been applied.

Question 19

Reaction time-

Answer 19

The time between a person detecting a stimulus and their response.

Question 20

Stopping distance = Thinking distance + Braking distance

Answer 20

.

Question 21

Crumple zone-

Answer 21

A vehicle safety device in which part of the vehicle is designed to crumple in a crash, reducing the force of impact.