1.1-1.3

Question 1

What does the gradient of a displacement-time graph show?

Answer 1

Velocity

Question 2

What does the area under and gradient of a velocity-time graph show?

Answer 2

Area under- Displacement

Gradient- Acceleration

Question 3

How does the direction of frictional forces compare to the direction of motion of an object?

Answer 3

Opposes the motion

Question 4

What calculation is used to find the component of weight down a slope?

Answer 4

mg=sin@

Question 5

What calculation is used to find the component of weight acting onto the slope?

Answer 5

mg=cos@

Question 7

What is meant by elastic or inelastic collision?

Answer 7

In an elastic collision, kinetic energy is conserved

In an inelastic collision, kinetic energy is not conserved (decreases)

Question 8

What is impulse?

Answer 8

Change in momentum:

Ft=mv-mu

Question 9

What does the area under a force-time graph show?

Answer 9

Impulse

Question 11

State the law of conservation of energy

Answer 11

The total momentum before a collision is equal to the total momentum after the collision in the absence of external forces