Momentum - AP Physics 1
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What is the momentum of a 2 kg object at rest?
What is the momentum of a 2 kg object at rest?
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0 kg·m/s. Zero velocity means zero momentum regardless of mass.
0 kg·m/s. Zero velocity means zero momentum regardless of mass.
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How does momentum change if velocity doubles and mass stays constant?
How does momentum change if velocity doubles and mass stays constant?
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Momentum doubles. Momentum is directly proportional to velocity.
Momentum doubles. Momentum is directly proportional to velocity.
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Calculate the momentum of a 3 kg object traveling at 4 m/s.
Calculate the momentum of a 3 kg object traveling at 4 m/s.
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$p = 12$ kg·m/s. Using $p = mv = 3×4 = 12$ kg·m/s.
$p = 12$ kg·m/s. Using $p = mv = 3×4 = 12$ kg·m/s.
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Identify the variable representing impulse.
Identify the variable representing impulse.
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Impulse is represented by $J$. Standard physics notation for impulse.
Impulse is represented by $J$. Standard physics notation for impulse.
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What is the momentum change if a 3 kg object accelerates from 0 to 3 m/s?
What is the momentum change if a 3 kg object accelerates from 0 to 3 m/s?
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9 kg·m/s. Change is $3×3 - 3×0 = 9$ kg·m/s.
9 kg·m/s. Change is $3×3 - 3×0 = 9$ kg·m/s.
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How does friction affect momentum in a system?
How does friction affect momentum in a system?
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Friction can reduce momentum. Friction is an external force that affects momentum.
Friction can reduce momentum. Friction is an external force that affects momentum.
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If a system has two objects at rest, what is the total momentum?
If a system has two objects at rest, what is the total momentum?
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0 kg·m/s. Rest means zero velocity for both objects.
0 kg·m/s. Rest means zero velocity for both objects.
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Determine the change in momentum for a 4 kg object increasing speed from 2 m/s to 5 m/s.
Determine the change in momentum for a 4 kg object increasing speed from 2 m/s to 5 m/s.
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12 kg·m/s. Change is $4×5 - 4×2 = 20 - 8 = 12$ kg·m/s.
12 kg·m/s. Change is $4×5 - 4×2 = 20 - 8 = 12$ kg·m/s.
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Find momentum if mass is 7 kg and velocity is 3 m/s.
Find momentum if mass is 7 kg and velocity is 3 m/s.
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$p = 21$ kg·m/s. Using $p = mv = 7×3 = 21$ kg·m/s.
$p = 21$ kg·m/s. Using $p = mv = 7×3 = 21$ kg·m/s.
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What is the effect on momentum if mass is halved and velocity is doubled?
What is the effect on momentum if mass is halved and velocity is doubled?
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Momentum stays the same. The mass and velocity changes cancel out.
Momentum stays the same. The mass and velocity changes cancel out.
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State the relationship between force and change in momentum.
State the relationship between force and change in momentum.
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Force equals the rate of change of momentum. This is Newton's second law in momentum form.
Force equals the rate of change of momentum. This is Newton's second law in momentum form.
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Find the velocity if momentum is 30 kg·m/s and mass is 5 kg.
Find the velocity if momentum is 30 kg·m/s and mass is 5 kg.
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$v = 6$ m/s. Rearranging $p = mv$ gives $v = p/m = 30/5$.
$v = 6$ m/s. Rearranging $p = mv$ gives $v = p/m = 30/5$.
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What is the formula for impulse?
What is the formula for impulse?
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$J = F \times \triangle t$. Force multiplied by time interval gives impulse.
$J = F \times \triangle t$. Force multiplied by time interval gives impulse.
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What is the effect on momentum if mass is halved and velocity is doubled?
What is the effect on momentum if mass is halved and velocity is doubled?
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Momentum stays the same. The mass and velocity changes cancel out.
Momentum stays the same. The mass and velocity changes cancel out.
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What is the impulse if a force of 6 N acts for 3 s?
What is the impulse if a force of 6 N acts for 3 s?
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$J = 18$ Ns. Using $J = F×\Delta t = 6×3 = 18$ Ns.
$J = 18$ Ns. Using $J = F×\Delta t = 6×3 = 18$ Ns.
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Identify the variable for momentum in equations.
Identify the variable for momentum in equations.
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Momentum is represented by $p$. Standard physics notation for momentum.
Momentum is represented by $p$. Standard physics notation for momentum.
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How does momentum change if mass doubles and velocity stays constant?
How does momentum change if mass doubles and velocity stays constant?
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Momentum doubles. Momentum is directly proportional to mass.
Momentum doubles. Momentum is directly proportional to mass.
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Calculate momentum for a 4 kg object at 5 m/s.
Calculate momentum for a 4 kg object at 5 m/s.
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$p = 20$ kg·m/s. Using $p = mv = 4×5 = 20$ kg·m/s.
$p = 20$ kg·m/s. Using $p = mv = 4×5 = 20$ kg·m/s.
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Find momentum if mass is 7 kg and velocity is 3 m/s.
Find momentum if mass is 7 kg and velocity is 3 m/s.
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$p = 21$ kg·m/s. Using $p = mv = 7×3 = 21$ kg·m/s.
$p = 21$ kg·m/s. Using $p = mv = 7×3 = 21$ kg·m/s.
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What is conserved in an elastic collision?
What is conserved in an elastic collision?
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Both momentum and kinetic energy. These are the two conserved quantities in elastic collisions.
Both momentum and kinetic energy. These are the two conserved quantities in elastic collisions.
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If momentum is 20 kg·m/s and velocity is 4 m/s, find the mass.
If momentum is 20 kg·m/s and velocity is 4 m/s, find the mass.
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$m = 5$ kg. Rearranging $p = mv$ gives $m = p/v = 20/4$.
$m = 5$ kg. Rearranging $p = mv$ gives $m = p/v = 20/4$.
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What is the resulting force if a 15 Ns impulse occurs over 3 s?
What is the resulting force if a 15 Ns impulse occurs over 3 s?
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$F = 5$ N. Rearranging $J = F×\Delta t$ gives $F = J/\Delta t = 15/3$.
$F = 5$ N. Rearranging $J = F×\Delta t$ gives $F = J/\Delta t = 15/3$.
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Define momentum.
Define momentum.
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Momentum is the product of mass and velocity. This definition follows directly from $p = mv$.
Momentum is the product of mass and velocity. This definition follows directly from $p = mv$.
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State the unit for impulse.
State the unit for impulse.
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Newton second (Ns). Newton second is equivalent to kg·m/s.
Newton second (Ns). Newton second is equivalent to kg·m/s.
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Identify the variable representing impulse.
Identify the variable representing impulse.
Tap to reveal answer
Impulse is represented by $J$. Standard physics notation for impulse.
Impulse is represented by $J$. Standard physics notation for impulse.
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What is the momentum change if a 3 kg object accelerates from 0 to 3 m/s?
What is the momentum change if a 3 kg object accelerates from 0 to 3 m/s?
Tap to reveal answer
9 kg·m/s. Change is $3×3 - 3×0 = 9$ kg·m/s.
9 kg·m/s. Change is $3×3 - 3×0 = 9$ kg·m/s.
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How does friction affect momentum in a system?
How does friction affect momentum in a system?
Tap to reveal answer
Friction can reduce momentum. Friction is an external force that affects momentum.
Friction can reduce momentum. Friction is an external force that affects momentum.
← Didn't Know|Knew It →
If a system has two objects at rest, what is the total momentum?
If a system has two objects at rest, what is the total momentum?
Tap to reveal answer
0 kg·m/s. Rest means zero velocity for both objects.
0 kg·m/s. Rest means zero velocity for both objects.
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Determine the change in momentum for a 4 kg object increasing speed from 2 m/s to 5 m/s.
Determine the change in momentum for a 4 kg object increasing speed from 2 m/s to 5 m/s.
Tap to reveal answer
12 kg·m/s. Change is $4×5 - 4×2 = 20 - 8 = 12$ kg·m/s.
12 kg·m/s. Change is $4×5 - 4×2 = 20 - 8 = 12$ kg·m/s.
← Didn't Know|Knew It →
What is the momentum of a 2 kg object at rest?
What is the momentum of a 2 kg object at rest?
Tap to reveal answer
0 kg·m/s. Zero velocity means zero momentum regardless of mass.
0 kg·m/s. Zero velocity means zero momentum regardless of mass.
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