Movement and Forces

Question 1

What is a scalar quantity?

Answer 1

A force with magnitude but no direction.

Question 2

What is a vector quantity?

Answer 2

A force with magnitude and direction.

Question 3

Give four examples of scalar quantities.

Answer 3

Speed, mass, distance, temperature.

Question 4

Give four examples of vector quantities.

Answer 4

Velocity, weight, displacement, acceleration.

Question 5

What does SUVAT stand for?

Answer 5

Displacement, Initial Velocity, Final Velocity, Acceleration and Time.

Question 6

What is the gradient of a displacement-time graph?

Answer 6

Velocity.

Question 7

What is the gradient of a velocity-time graph?

Answer 7

Acceleration.

Question 8

What is the area underneath a velocity-time graph?

Answer 8

Displacement

Question 9

If a line is flat in a displacement-time graph, what does it represent?

Answer 9

That the object is stationary.

Question 10

If a line is flat in a velocity-time graph, what does it represent?

Answer 10

That the object is moving at a constant speed.

Question 11

What is the average acceleration due to gravity?

Answer 11

g=9.81

Question 12

What is the center of mass?

Answer 12

The point on an object that is acted on by weight.

Question 13

Where will the center of mass be for a uniform body?

Answer 13

In the middle.

Question 14

What is instantaneous velocity?

Answer 14

The velocity of an object at a specific point in time.

Question 15

What is average velocity?

Answer 15

The velocity of an object over a specific time frame.

Question 16

What is uniform acceleration?

Answer 16

Where the acceleration of an object is constant.

Question 17

What is the area underneath an acceleration time graph?

Answer 17

Velocity

Question 18

What is Newton’s 1st Law?

Answer 18

An object that is at rest or at a constant velocity, will not change until acted upon by a resultant force.

Question 19

What is Newton’s 2nd Law?

Answer 19

The acceleration of an object is proportional to the force experienced by the object. (AKA F=ma)

Question 20

What is Newton’s 3rd Law?

Answer 20

For each force experienced by an object, the object exerts an equal and opposite force.

Question 21

What are the 4 SUVAT equations?

Answer 21

v = u + at
s = ½(u + v) x t
s = ut + ½at²
v² = u² + 2as

Question 22

How do we resolve a vector?

Answer 22

We split a resultant vector into the x-direction and y-direction.

Question 23

What’s a free body diagram?

Answer 23

A diagram which uses arrows to show forces on the body’s we are interested in.

Question 24

What’s the definition of weight?

Answer 24

Weight is the force acting upon an object due to gravity.

Question 25

How do we know if a pair of forces are obeying Newtons Third Law?

Answer 25

Same type of force. Same magnitude. Act on different bodies Act in opposite directions.

Question 26

What are coplanar forces?

Answer 26

Where all the forces in a system are acting on the same plane.

Question 27

What is 1 newton?

Answer 27

1 newton is the force required to accelerate 1kg of mass 1ms⁻² in the direction of the force.

Question 28

What must be constant for us to use the equation F=ma?

Answer 28

mass